To Do List:
Rd405: 78+
Rd15403 80+
-NC-, -NF- and -NEF- (all 1 1/8+)
N and UNR (constant pitch): -6-, -8-, -10-, -12-, -16-, -20- (1½+), and -24- t.p.i.

Basic Diameters and Thread Profiles of Screws Old and New

↓Explanatory Notes↓

Thread codes and links to the full-size diagrams:

Thury • Swiss Instrument Thread Sellers • American National Thread

SI • Système International (Fra. & Deu.) W.INS • Whitworth Instrument

SPARK • Spark Plug threads WALTH Waltham Clock thread

Rd 405 • Round Thread, DIN 405 BSW • British Standard Whitworth

NPSM • Am. Nat'l Str. Pipe, Mechan'l UNR, MR • Unified National (Rounded Roots)

ADM • Admiralty Fine Thread SB • Stove Bolt

CROWN watch crown threads BSF • British Standard Fine

Ng • Nähmaschinengewinde (sewing mach. thread) GAS Gas (Brass Pipe) thread

BSPP • British Standard Pipe, Parallel Pg • Stahlpanzerrohrgewinde (steel conduit thread)

BUTTON watch button threads WPIPE • Whitworth Pipe thread

Rd 20400 • Round Thread, DIN 20400 USF • United States Form

H & Co Holtzapffel & Co. Thread ELGIN Elgin watch screws

BSB • British Standard Brass thread Delisle • Delisle Thread (aka Löwenherz, VDI)

PEND watch pendant threads CEI, Fg • Cycle Engineers Institute

UNM • Unified National (High-Strength) PROG Progress Clock thread

BA • British Association E • Edison Thread

Rd 15403 • Round Thread, DIN 15403 USS • United States Standard

Short Cuts #0 #2 #4 #6 #8 #10 #12 1⁄4" 3⁄8" 1⁄2" 5⁄8" 3⁄4" 7⁄8" 1" 1 1⁄2" 2" 3"
M1 M2 M3 M4 M5 M6 M8 M10 M12 M15 M20 M25 M30 M40 M50 M60 M70

Designation, Size, or name	Thread Name or Series	Dia.	Dia.	Pitch	Pitch	Core Dia.	Core Dia.	Depth	Depth
Designation, Size, or name	Thread Name or Series	(Inch)	(mm)	(t.p.i.)	(mm)	(Inch)	(mm)	(Inch)	(mm)
25	BA		.250		.072		.164		.043
10	W.INS	.0100		400		.0064		.0016
25	Thury		.254		.072		.168		.043
11	W.INS	.0110		400		.0074		.0016
24	Thury		.289		.080		.193		.048
24	BA		.290		.080		.194		.048
.3 Coarse	MR		.300		.080		.199		.049
.3	MR		.300		.075		.205		.046
.30mm	UNM		.300		.080		.208		.046
12	W.INS	.0120		350		.0079		.0018
23	Thury		.328		.089		.221		.053
23	BA		.330		.090		.222		.054
13	W.INS	.0130		350		.0089		.0018
	ELGIN	.0132		360		.0112
.35 Coarse	MR		.350		.090		.240		.055
.35mm	UNM		.350		.090		.246		.052
23	WALTH		.350	254		.0107		.0016
14	W.INS	.0140		300		.0092		.0021
22	BA		.370		.098		.252		.059
22	Thury		.372		.098		.253		.059
	ELGIN	.0148		320		.0120		.0014
15	W.INS	.0150		300		.0102		.0021
4	PROG		.400		.100		.240		.080
.4 Coarse	MR		.400		.100		.277		.061
.40mm	UNM		.400		.100		.285		.058
16	W.INS	.0160		300		.0112		.0021
21	BA		.420		.110		.288		.066
21	Thury		.422		.109		.290		.066
	ELGIN	.0168		260		.0132		.0018
17	W.INS	.0170		250		.0113		.0026
4½	PROG		.450		.100		.290		.080
.45 Coarse	MR		.450		.100		.327		.061
21	WALTH		.450	240		.0134		.0022
.45mm	UNM		.450		.100		.335		.058
18	W.INS	.0180		250		.0123		.0026
20	Thury		.479		.122		.333		.073
20	BA		.480		.120		.336		.072
19	W.INS	.0190		250		.0133		.0026
5	PROG		.500		.125		.300		.100
.5 Coarse	MR		.500		.125		.347		.077
.50mm	UNM		.500		.125		.356		.072
20	W.INS	.0200		210		.0132		.0030
	ELGIN	.0208		220		.0168		.0020
#0000-160	NC	.0210		160		.0129		.0041
#0000-160	UNRC	.0210		160		.0133		.0038
19	BA		.540		.140		.372		.084
19	Thury		.543		.135		.381		.081
5½	PROG		.550		.125		.350		.100
.55 Coarse	MR		.550		.125		.397		.077
.55mm	UNM		.550		.125		.406		.072
19	WALTH		.550	220		.0177		.0020
22	W.INS	.0220		210		.0152		.0030
	ELGIN	.0228		260		.0188		.0020
6	PROG		.600		.150		.360		.120
.6 Coarse	MR		.600		.150		.416		.092
.60mm	UNM		.600		.150		.427		.087
24	W.INS	.0240		210		.0172		.003
18	Thury		.616		.150		.436		.090
18	BA		.620		.150		.440		.090
	ELGIN	.0248		220		.0200		.0024
6½	PROG		.650		.150		.410		.120
17	WALTH		.650	200		.0213		.0022
26	W.INS	.0260		180		.0181		.0036
	ELGIN	.0268		180		.0220		.0024
17	Thury		.699		.167		.499		.100
7	PROG		.700		.175		.420		.140
.7 Coarse	MR		.700		.175		.485		.107
17	BA		.700		.170		.496		.102
.70mm	UNM		.700		.175		.498		.101
28	W.INS	.0280		180		.0201		.0036
	ELGIN	.0288		220		.0248		.0020
7½	PROG		.750		.175		.470		.140
30	W.INS	.0300		180		.0221		.0036
12 Swiss	BUTTON	.0300		140
	ELGIN	.0308		180		.0248		.0030
	ELGIN	.0308		220		.0268		.0020
16	BA		.790		.190		.562		.114
16	Thury		.794		.185		.571		.111
8	PROG		.800		.200		.480		.160
.8 Coarse	MR		.800		.200		.555		.123
.80mm	UNM		.800		.200		.569		.115
32	W.INS	.0320		180		.0241		.0036
15	WALTH		.830	180		.0280		.0024
11 Swiss	BUTTON	.0330		140
8½	PROG		.850		.200		.530		.16
#000-120	NC	.0340		120		.0232		.0054
#000-120	UNRC	.0340		120		.0238		.0051
34	W.INS	.0340		150		.0245		.0043
10A Swiss	BUTTON	.0340		110
10 Swiss	BUTTON	.0350		110
9	PROG		.900		.225		.540		.180
.9 Coarse	MR		.900		.225		.624		.138
.90mm	UNM		.900		.225		.640		.130
15	BA		.900		.210		.648		.126
15	Thury		.901		.206		.653		.124
10 US	BUTTON	.0360		113
10B	BUTTON	.0360		110
36	W.INS	.0360		150		.0265		.0043
9	WALTH		.930	160		.0280		.0043
	ELGIN	.0368		220		.0268		.0050
	ELGIN	.0368		140		.0280		.0044
9 1/2	PROG		.950		.225		.590		.180
38	W.INS	.0380		120		.0261		.0053
9 Swiss	BUTTON	.0390		110
10	PROG		1.000		.250		.600		.200
1	Delisle		1.000		.250		.625		.188
1	SI		1.000		.250		.648		.176
1 Coarse	MR		1.000		.250		.693		.153
1.00mm	UNM		1.000		.250		.711		.144
14	BA		1.000		.230		.724		.138
1 Fine	MR		1.000		.200		.755		.123
7	WALTH		1.000	140		.0335		.0030
13	WALTH		1.000	180		.0335		.0030
40	W.INS	.0400		120		.0281		.0053
14	Thury		1.022		.229		.747		.137
	ELGIN	.0408		120L		.0300		.0054
	ELGIN	.0408		200		.0348		.0030
9 ELGIN	BUTTON	.0410		120
	ELGIN	.0428		120		.0328		.0050
8	BUTTON	.0430		100
11	PROG		1.100		.275		.660		.220
1.1	SI		1.100		.250		.748		.176
1.1 Coarse	MR		1.100		.250		.793		.153
1.10mm	UNM		1.100		.250		.811		.144
1.1 Fine	MR		1.100		.200		.855		.122
5	WALTH		1.100	120		.0374		.0030
	ELGIN	.0448		110		.0340		.0054
45	W.INS	.0450		120		.0331		.0053
13	Thury		1.160		.254		.855		.153
	ELGIN	.0468		110		.0348		.0060
#00-90	NC	.0470		90		.0326		.0072
#00-90	UNRC	.0470		90		.0334		.0068
#00-96	NF	.0470		96		.0335		.0068
#00-96	UNRF	.0470		96		.0342		.0064
#00-112	Sellers	.0470		112		.0354		.0058
3, 6, & 7	BUTTON	.0470		110
12	PROG		1.200		.300		.720		.240
1.2	Delisle		1.200		.250		.825		.188
1.2	SI		1.200		.250		.848		.176
1.2 Coarse	MR		1.200		.250		.893		.153
13	BA		1.200		.250		.900		.150
1.20mm	UNM		1.200		.250		.911		.144
3	WALTH		1.200	110		.0402		.0035
1.2 Fine	MR		1.200		.200		1.077		.123
5/0-10/0	CROWN	.0480		110		.0380		.0050
	ELGIN	.0488		140		.0400		.0044
	ELGIN	.0488		200		.0436		.0026
50	W.INS	.0500		100		.0357		.0064
	ELGIN	.0508		110L		.0388		.0060
4	BUTTON	.0510		84
13	PROG		1.300		.325		.780		.260
12	BA		1.300		.282		.961		.169
12	Thury		1.316		.282		.977		.169
11	WALTH	.0528		170		.0480		.0024
5	BUTTON	.0540		84
	ELGIN	.0548		180		.0488
55	W.INS	.0550		100		.0407		.0064
14	PROG		1.400		.350		.840		.280
1.4	Delisle		1.400		.300		.950		.225
1.4	SI		1.400		.300		.978		.211
1.4 Coarse	MR		1.400		.300		1.032		.184
1.40mm	UNM		1.400		.250		1.111		.144
1.4 Fine	MR		1.400		.200		1.155		.123
.056 (17 SWG)	CEI	.0560		62		.0388		.0086
2 (pin lever)	BUTTON	.0580		84
11	Thury		1.493		.314		1.117		.188
15	PROG		1.500		.375		.900		.300
11	BA		1.500		.314		1.123		.188
1	WALTH		1.500	110		.0520		.0035
#0-80	NF	.0600		80		.0438		.0081
#0-80	UNRF	.0600		80		.0447		.0077
2 (pocket)	BUTTON	.0600		80
60	W.INS	.0600		100		.0457		.0064
	ELGIN	.0608		110		.0488		.0060
	ELGIN	.0608		110L		.0488		.0060
12-6-0	CROWN	.0610		80		.0480		.0065
1/16	BSW	.0625		60		.0387		.0107
1/16 (16 USG)	Sellers	.0625		60		.0408		.0108
1/16 (16 USG)	USS	.0625		64		.0422		.0101
1/16 (16 USG)	Sellers	.0625		72		.0445		.0090
16	PROG		1.600		.457		.869		.366
1.6 Coarse	MR		1.600		.350		1.171		.215
1.6	SI		1.600		.300		1.178		.211
1.6 Fine	MR		1.600		.200		1.355		.123
.064 (16 SWG)	CEI	.0640		62		.0468		.0086
10	Thury		1.695		.349		1.276		.209
65	W.INS	.0650		80		.0471		.0080
17	PROG		1.700		.486		.922		.389
1.7	Delisle		1.700		.350		1.175		.263
1.7	MR		1.700		.350		1.271		.215
10	BA		1.700		.349		1.281		.209
1.7	MR		1.700		.250		1.393		.153
1.7	MR		1.700		.200		1.455		.123
70	W.INS	.0700		80		.0521		.0080
	ELGIN	.0708		180L		.0648		.0030
18	PROG		1.800		.514		.978		.411
1.8	SI		1.800		.400		1.237		.281
1.8 Coarse	MR		1.800		.350		1.371		.215
1.8 Fine	MR		1.800		.200		1.555		.123
.072 (15 SWG)	CEI	.0720		62		.0548		.0086
#1-56	Sellers	.0730		56		.0498		.0116
#1-64	Sellers	.0730		64		.0527		.0102
#1-64	UNRC	.0730		64		.0538		.0096
#1-72	Sellers	.0730		72		.0550		.0090
#1-72	UNRF	.0730		72		.0560		.0085
1	BUTTON	.0740		72
19	PROG		1.900		.543		1.031		.434
9	BA		1.900		.387		1.435		.232
75	W.INS	.0750		80		.0571		.0080
9	Thury		1.923		.387		1.458		.232
	ELGIN	.0768		110L		.0708		.0030
16	CROWN	.0770		72		.0630		.0070
	ELGIN	.0772		80L		.0612		.0080
5/64	BSW	.078125		56		.0526		.0114
5/64 (14 USG)	Sellers	.078125		56		.0549		.0116
5/64 (14 USG)	USS	.078125		60		.0565		.0108
5/64 (14 USG)	Ng	.078125		64		.0578		.0102
5/64 (14 USG)	Sellers	.078125		72		.0601		.0090
20	PROG		2.000		.571		1.086		.457
2	Delisle		2.000		.400		1.400		.300
2	SI	78.7 mils	2.000		.400		1.437		.281
2 Coarse	MR		2.000		.400		1.509		.245
2 Fine	MR		2.000		.250		1.693		.153
80	W.INS	.0800		60		.0562		.0107
.080 (14 SWG)	CEI	.0800		56		.0610		.0095
.080 (14 SWG)	CEI	.0800		62		.0628		.0086
85	W.INS	.0850		60		.0612		.0107
8	Thury		2.182		.430		1.666		.258
#2-56	Sellers	.0860		56		.0628		.0116
#2-56	UNRC	.0860		56		.0641		.0110
#2-64	Sellers	.0860		64		.0657		.0101
#2-64	UNRF	.0860		64		.0668		.0096
2.2	SI		2.200		.450		1.567		.317
2.2 Coarse	MR	86.6 mils	2.200		.450		1.648		.276
8	BA		2.200		.430		1.684		.258
2.2 Fine	MR		2.200		.250		1.893		.153
0	BUTTON	.0890		60
	ELGIN	.0892		80L		.0712		.0090
90	W.INS	.0900		60		.0662		.0107
2.3	Delisle		2.300		.400		1.700		.300
2.3	MR		2.300		.400		1.801		.245
2.3	MR	90.6 mils	2.300		.350		1.871		.215
2.3	MR		2.300		.250		1.993		.153
18.0	CROWN	.0910		60		.0710		.0100
.092 (13 SWG)	CEI	.0920		56		.0730		.0095
3/32	BSW	.09375		48		.0640		.0133
3/32 (13 USG)	Sellers	.09375		48		.0667		.0135
3/32 (13 USG)	USS	.09375		50		.0678		.0130
3/32 (13 USG)	Ng	.09375		56		.0706		.0116
3/32 (13 USG)	Sellers	.09375		60		.0721		.0108
3/32 (13 USG)	Ng	.09375		100		.0808		.0065
95	W.INS	.0950		50		.0664		.0128
7	Thury		2.476		.478		1.902		.287
2.5	SI		2.500		.450		1.867		.317
7	BA		2.500		.478		1.926		.287
2.5 Coarse	MR	98.4 mils	2.500		.450		1.948		.276
2.5 Fine	MR		2.500		.350		2.071		.215
#3-32	32N	.0990		32		.0584		.0203
#3-48	Sellers	.0990		48		.0719		.0135
#3-48	UNRC	.0990		48		.0734		.0128
#3-56	Sellers	.0990		56		.0758		.0116
#3-56	UNRF	.0990		56		.0771		.0110
Designation, Size, or name	Thread Name or Series	Dia.	Dia.	Pitch	Pitch	Core Dia.	Core Dia.	Depth	Depth
Designation, Size, or name	Thread Name or Series	(Inch)	(mm)	(t.p.i.)	(mm)	(Inch)	(mm)	(Inch)	(mm)
100	W.INS	.1000		50		.0714		.0128
U	H & Co.	.1000		55.11
10/0	PEND		2.580	90			2.150	.0085
2.6	Delisle		2.600		.450		1.925		.338
2.6	MR		2.600		.500		1.987		.307
2.6	MR	102.4 mils	2.600		.450		2.048		.276
2.6	MR		2.600		.350		2.171		.215
2.6	MR		2.600		.250		2.293		.153
.104 (12 SWG)	CEI	.1040		56		.0850		.0095
.104 (12 SWG)	CEI	.1040		44		.0798		.0121
2.7	MR		2.700		.300		2.332		.184
7/64	BSW	.109375		48		.0796		.0133
7/64 (12 USG)	USS	.109375		48		.0823		.0135
6	BA		2.800		.531		2.163		.319
2.8	MR	110.2 mils	2.800		.300		2.432		.184
6	Thury		2.810		.531		2.172		.319
#4-32	32N	.1120		32		.0714		.0203
#4-32	32UNR	.1120		32		.0737		.0192
#4-36	Sellers	.1120		36		.0759		.0180
#4-40	Sellers	.1120	2.845 mm	40		.0795		.0162
#4-40	UNRC	.1120		40		.0813		.0153
#4-48	Sellers	.1120		48		.0849		.0135
#4-48	UNRF	.1120		48		.0864		.0128
.116 (11 SWG)	CEI	.1160		44		.0918		.0121
3	SI		3.000		.600		2.156		.422
3	Delisle		3.000		.500		2.250		.375
3	MR		3.000		.600		2.264		.368
3	SI	118.1 mils	3.000		.500		2.296		.352
3 Coarse	MR		3.000		.500		2.387		.307
3 Fine	MR		3.000		.350		2.632		.184
T	H & Co.	.1200		55.11
1/8	BSB	.1250		26		.0701		.0246
1/8 (11 USG), #5-32	SB, 32N	.1250		32		.0844		.0203
#5-32	32UNR	.1250		32		.0867		.0192
1/8 (11 USG), #5-36	Sellers	.1250		36		.0889		.0180
1/8	BSW	.1250		40		.0893		.0160
1/8 (11 USG), #5-40	USS	.1250	3.175 mm	40		.0925		.0162
#5-40	UNRC	.1250		40		.0943		.0153
1/8 (11 USG), #5-44	Sellers, Ng	.1250		44		.0955		.0148
#5-44	UNRF	.1250		44		.0971		.0139
1/8 (11 USG), #5-48	Sellers	.1250		48		.0979		.0135
1/8	CEI	.1250		40		.0984		.0133
5	Thury		3.189		.590		2.480		.354
5	BA		3.200		.590		2.492		.354
5/0	PEND		3.200	80			2.850	.0069
.128 (10 SWG)	CEI	.1280		40		.1014		.0133
3.3	?		3.300		.600		?		?
3.4	MR		3.400		.500		2.787		.307
S	H & Co.	.1350		55.11
3.5	Delisle		3.500		.600		2.600		.450
3.5	SI		3.500		.600		2.656		.422
3.5 Coarse	MR	137.8 mils	3.500		.600		2.764		.368
3.5 Fine	MR		3.500		.350		3.071		.215
#6-32	32N	.1380		32		.0974		.0203
#6-32	UNRC, 32UNR	.1380		32		.0997		.0192
#6-36	Sellers	.1380		36		.1019		.0203
#6-40	Sellers	.1380		40		.1055		.0162
#6-40	UNRF	.1380		40		.1073		.0153
9/64 (10 USG)	Sellers	.140625		32		.1000		.0203
9/64 (10 USG)	Sellers	.140625		36		.1045		.0180
9/64 (10 USG)	USS, Ng	.140625		40		.1081		.0162
4	BA		3.600		.656		2.813		.394
4	Thury		3.618		.656		2.831		.394
.144 (9 SWG)	CEI	.1440		40		.1174		.0133
0.148	GAS	.1480		32
R	H & Co.	.1500		55.11
#7-30	Sellers	.1510		30		.1077		.0217
#7-32	32N	.1510		32		.1104		.0203
#7-32	UNRC, 32UNR	.1510		32		.1127		.0192
#7-36	Sellers	.1510		36		.1149		.0180
#7-36	UNRF	.1510		36		.1169		.0170
0	PEND		3.900	66			3.450	.0089
.154	CEI	.1540		40		.1274		.0133
5/32	BSB	.15625		26		.1070		.0246
5/32 (9 USG)	Sellers	.15625		28		.1124		.0219
5/32 (9 USG)	Sellers	.15625		32		.1157		.0203
5/32	BSW	.15625		32		.1162		.0200
5/32 (9 USG)	USS	.15625		36		.1202		.0180
5/32 (9 USG)	Sellers	.15625		40		.1238		.0162
5/32	BSC	.15625		32		.1231		.0166
4	SI		4.000		.750		2.945		.528
4	Delisle		4.000		.700		2.950		.525
4	SI		4.000		.700		3.015		.493
4	MR		4.000		.800		3.019		.491
4	MR	157.5 mils	4.000		.750		3.080		.460
4 Coarse	MR		4.000		.700		3.141		.429
4 Fine	MR		4.000		.500		3.387		.307
.16 (8 SWG)	CEI	.1600		32		.1267		.0166
3	BA		4.100		.729		3.225		.438
3	Thury		4.106		.729		3.231		.437
Q	H & Co.	.1625		39.83
#8-30	Sellers	.1640		30		.1207		.0217
#8-32	32N	.1640		32		.1234		.0203
#8-32	UNRC, 32UNR	.1640		32		.1257		.0192
#8-36	Sellers	.1640		36		.1279		.0180
#8-36	UNRF	.1640		36		.1299		.0171
#8-40	Sellers	.1640		40		.1315		.0162
11/64 (8 USG)	USS	.171875		32		.1313		.0203
11/64 (8 USG)	Sellers	.171875		36		.1358		.0180
11/64 (8 USG)	Ng	.171875		40		.1394		.0162
12-6	PEND		4.400	66			3.950	.0089
.176 (7 SWG)	CEI	.1760		32		.1427		.0166
#9-24	Sellers	.1770		24		.1229		.0271
#9-24	UNRC	.1770		24		.1259		.0256
#9-30	Sellers	.1770		30		.1337		.0217
#9-32	32N	.1770		32		.1364		.0203
#9-32	UNRF, 32UNR	.1770		32		.1387		.0192
4.5	Delisle		4.500		.750		3.375		.563
4.5	SI		4.500		.750		3.445		.528
4.5 Coarse	MR	177.2 mils	4.500		.750		3.580		.460
4.5 Fine	MR		4.500		.500		3.887		.307
O	H & Co.	.1800		36.1
2	Thury		4.659		.810		3.687		.486
2	BA		4.700		.810		3.728		.486
3/16 (7 USG)	Sellers	.1875		20		.1225		.0325
3/16	BSW	.1875		24		.1280		.0267
3/16 (7 USG)	USS, SB	.1875		24		.1334		.0271
3/16	BSB	.1875		26		.1382		.0246
3/16 (7 USG)	27N	.1875		27		.1394		.0241
3/16 (7 USG)	Ng	.1875		28		.1411		.0232
3/16	BSF	.1875		32		.1429		.0200
3/16 (7 USG)	Sellers	.1875		30		.1442		.0217
3/16 (7 USG)	32N, Ng	.1875		32		.1469		.0203
3/16 (7 USG)	Sellers	.1875		36		.1514		.0180
3/16	CEI	.1875		32		.1542		.0166
#10-24	Sellers	.1900		24		.1359		.0271
#10-24	UNRC	.1900		24		.1389		.0256
#10-28	28N	.1900		28		.1436		.0232
#10-30	Sellers	.1900		30		.1467		.0217
#10-32	32N	.1900		32		.1494		.0203
#10-32	UNRF, 32UNR	.1900		32		.1517		.0192
#10-56	Sellers	.1900		56		.1668		.0116
P	H & Co.	.1900		39.83
0.196	GAS	.1960		32
5	SI		5.000		.900		3.733		.633
5	Delisle		5.000		.800		3.800		.600
5	SI		5.000		.800		3.874		.563
5	MR	196.9 mils	5.000		.900		3.896		.552
5	SI		5.000		.750		3.945		.528
5 Coarse	MR		5.000		.800		4.019		.491
5	?		5.000		.600		?		?
5 Fine	MR		5.000		.500		4.387		.307
16	PEND		5.000	60			4.500	.0098
N	H & Co.	.2000		36.1
13/64 (6 USG)	USS	.203125		24		.1490		.0271
13/64 (6 USG)	Sellers	.203125		32		.1625		.0203
.206	Schrader	.2060		36		.1699		.0180
1	Thury		5.287		.900		4.207		.540
1	BA		5.300		.900		4.220		.540
L	H & Co.	.2100		28.88
#12-20	Sellers	.2160		20		.1510		.0325
#12-24	Sellers	.2160		24		.1619		.0271
#12-24	UNRC	.2160		24		.1649		.0256
#12-28	NF, 28N	.2160		28		.1696		.0232
#12-28	UNRF, 28UNR	.2160		28		.1772		.0219
#12-32	32N	.2160		32		.1754		.0203
#12-32	UNREF, 32UNR	.2160		32		.1777		.0192
5.5	Delisle		5.500		.900		4.150		.675
5.5	SI		5.500		.900		4.233		.633
5.5 Coarse	MR	216.5 mils	5.500		.900		4.396		.552
5.5 Fine	MR		5.500		.500		4.887		.307
7/32	BSW	.21875		24		.1592		.0267
7/32 (5 USG)	SB	.21875		22		.1597		.0295
7/32 (5 USG)	USS	.21875		24		.1646		.0271
7/32	BSF	.21875		28		.1677		.0230
7/32 (5 USG)	Sellers	.21875		28		.1724		.0232
7/32	BSC	.21875		26		.1778		.0205
7/32 (5 USG)	32N	.21875		32		.1782		.0203
Midget	E	.21875		25		.2022		.0083
#13-14	Sellers	.2290		14		.1362		.0464
18	PEND		5.900	50			5.280	.0122
15/64 (4 USG)	USS	.234375		24		.1802		.0271
15/64 (4 USG)	Sellers, Ng	.234375		28		.1880		.0232
15/64 (4 USG)	Sellers	.234375		32		.1938		.0203
6	Delisle		6.000		1.000		4.500		.750
6	SI		6.000		1.000		4.593		.704
6 Coarse	MR		6.000		1.000		4.773		.613
0	BA	236.2 mils	6.000		1.000		4.800		.600
0	Thury		6.000		1.000		4.800		.600
6 Fine	MR		6.000		.750		5.080		.460
6	MR		6.000		.500		5.387		.307
M	H & Co.	.2400		36.1
#14-20	Sellers	.2420		20		.1770		.0325
#14-20	UNRC	.2420		20		.1807		.0307
#14-24	Sellers	.2420		24		.1879		.0271
#14-24	UNRF	.2420		24		.1909		.0256
No.4	GAS	.2460		27
1/8"	BCT	.2480		28		.2023		.0229
6.3	MR		6.300		1.000		5.073		.613
¼ (3 USG)	14N	.2500		14		.1572		.0464
¼	14UNR	.2500		14		.1624		.0438
¼ (3 USG)	SB	.2500		18		.1778		.0361
¼	BSW	.2500		20		.1786		.0320
¼ (3 USG)	USS, NC, 20N	.2500		20		.1850		.0325
¼	UNRC, 20UNR	.2500	6.350 mm	20		.1887		.0307
¼	BSF	.2500		26		.1951		.0246
¼ (3 USG)	SPARK	.2500		24		.1959		.0271
¼	BSB	.2500		26		.2007		.0246
¼ (3 USG)	27N	.2500		27		.2019		.0241
¼ (3 USG)	NF, 28N	.2500		28		.2036		.0232
¼	27UNR	.2500		27		.2046		.0227
¼	UNRF, 28UNR	.2500		28		.2062		.0219
¼	CEI	.2500		26		.2090		.0205
¼ (3 USG)	NEF, 32N	.2500		32		.2094		.0203
¼	UNREF, 32UNR	.2500		32		.2117		.0192
¼ (3 USG)	Ng	.2500		40		.2175		.0162
K	H & Co.	.2500		25.71
¼	GAS	.2600		27
17/64	CEI	.265625		26		.2246		.0205
#16-18	Sellers	.2680		18		.1958		.0361
#16-20	Sellers	.2680		20		.2030		.0325
#16-22	Sellers	.2680		22		.2090		.0295
-1	Thury		6.809		1.111		5.475		.667
7	Delisle		7.000		1.100		5.350		.825
7	SI		7.000		1.000		5.593		.704
7 Coarse	MR	275.6 mils	7.000		1.000		5.773		.613
7 Fine	MR		7.000		.750		6.080		.460
7	MR		7.000		.500		6.387		.307
9/32 (1 USG)	Ng	.28125		20		.2163		.0325
9/32	BSF	.28125		26		.2263		.0246
9/32	BSB	.28125		26		.2320		.0246
9/32 (1 USG)	Ng	.28125		28		.2349		.0232
9/32	CEI	.28125		26		.2403		.0205
J	H & Co.	.2900		25.71
#18-18	Sellers	.2940		18		.2218		.0361
#18-20	Sellers	.2940		20		.2290		.0325
.302	Schrader	.3020		32		.2614		.0203
1/16"	BSPP	.3040		28		.2530		.0229
-2	Thury		7.726		1.235		6.245		.741
5/16 (0 USG)	14N	.3125		14		.2197		.0464
5/16	14UNR	.3125		14		.2249		.0438
5/16	BSW	.3125		18		.2331		.0356
5/16 (0 USG)	USS, NC, SB, Ng	.3125		18		.2403		.0361
5/16	UNRC	.3125		18		.2443		.0341
5/16 (0 USG)	20N	.3125		20		.2475		.0325
5/16	BSF	.3125		22		.2476		.0291
5/16	20UNR	.3125		20		.2512		.0307
5/16 (0 USG)	NF	.3125		24		.2584		.0271
5/16	UNRF	.3125		24		.2614		.0256
5/16	BSB	.3125		26		.2632		.0246
5/16 (0 USG)	27N	.3125		27		.2644		.0241
5/16 (0 USG)	28N	.3125		28		.2661		.0232
5/16	27UNR	.3125		27		.2671		.0227
5/16	28UNR	.3125		28		.2687		.0219
5/16	CEI	.3125		26		.2715		.0205
5/16 (0 USG)	NEF, 32N	.3125		32		.2719		.0203
5/16	UNREF, 32UNR	.3125		32		.2742		.0192
8	Rd 405		8.000	10			5.460	.0500
8	Delisle		8.000		1.200		6.200		.900
8	SI		8.000		1.250		6.241		.880
8 Coarse	MR	315.0 mils	8.000		1.250		6.466		.767
8 Fine	MR		8.000		1.000		6.773		.613
8 Fine	MR		8.000		.750		7.080		.460
8	MR		8.000		.500		7.387		.307
#20-16	Sellers	.3200		16		.2388		.0406
#20-18	Sellers	.3200		18		.2478		.0361
#20-20	Sellers	.3200		20		.2550		.0325
I	H & Co.	.3300		25.71
5/16	GAS	.3420		27
-3	Thury		8.768		1.372		7.121		.823
H	H & Co.	.3600		19.89
#22-16	Sellers	.3460		16		.2648		.0406
#22-18	Sellers	.3460		18		.2738		.0361
9	Rd 405		9.000	10			6.460	.0500
9	Delisle		9.000		1.300		7.050		.975
9	SI		9.000		1.250		7.241		.880
9 Coarse	MR	354.3 mils	9.000		1.250		7.466		.767
9 Fine	MR		9.000		1.000		7.773		.613
9 Fine	MR		9.000		.750		8.080		.460
#24-16	Sellers	.3720		16		.2908		.0406
#24-18	Sellers	.3720		18		.2998		.0361
3/8	14N	.3750		14		.2822		.0464
3/8	BSW	.3750		16		.2857		.0400
3/8	14UNR	.3750		14		.2874		.0428
3/8	USS, NC, SB	.3750		16		.2938		.0406
3/8	UNRC	.3750		16		.2983		.0383
3/8	Sellers	.3750		18		.3028		.0361
3/8	BSF	.3750		20		.3036		.0320
3/8	20N	.3750		20		.3100		.0325
3/8	20UNR	.3750		20		.3137		.0307
3/8	ADM	.3750		24		.3155		.0267
3/8	NF, SPARK	.3750	9.525 mm	24		.3209		.0271
3/8	UNRF	.3750		24		.3239		.0256
3/8	BSB	.3750		26		.3257		.0246
3/8	27N	.3750		27		.3269		.0241
3/8 (000 USG)	28N, Ng	.3750		28		.3286		.0232
3/8	27UNR	.3750		27		.3296		.0227
3/8	28UNR	.3750		28		.3312		.0219
3/8	CEI	.3750		26		.3340		.0205
3/8	NEF, 32N	.3750		32		.3344		.0203
3/8	UNREF, 32UNR	.3750		32		.3367		.0192
Miniature	E	.3750		14		.3454		.0148
1/8"	BSPP	.3830		28		.3320		.0229
¼"	BCT	.3890		20		.3250		.0320
3/8	GAS	.3900		27
25/64	UNR	.390625		27		.3452		.0227
25/64	ABMA	.390625		32		.3500		.0203
25/64	ABMA	.390625		32		.3523		.0192
-4	Thury		9.949		1.524		8.120		.914
10	Rd 15403		10.000		3.000		6.700		1.650
10	Rd 405		10.000	10			7.460	.0500
10	SI		10.000		1.500		7.889		1.055
10	Delisle		10.000		1.400		7.900		1.050
10 Coarse	MR		10.000		1.500		8.160		.920
10 Fine	MR		10.000		1.250		8.466		.767
10MM	SPARK	393.7 mils	10.000		1.000		8.701		.650
10 Fine	MR		10.000		1.000		8.773		.613
10 Fine	MR		10.000		.750		9.080		.460
Designation, Size, or name	Thread Name or Series	Dia.	Dia.	Pitch	Pitch	Core Dia.	Core Dia.	Depth	Depth
Designation, Size, or name	Thread Name or Series	(Inch)	(mm)	(t.p.i.)	(mm)	(Inch)	(mm)	(Inch)	(mm)
1/8"	NPSM	.3970		27		.3489		.0241
#26-14	Sellers	.3980		14		.3052		.0464
#26-16	Sellers	.3980		16		.3168		.0406
1/8"	WPIPE	.40625		28		.3605		.0229
G	H & Co.	.4100		19.89
#28-14	Sellers	.4240		14		.3312		.0464
#28-16	Sellers	.4240		16		.3428		.0406
11	Rd 405		11.000	10			8.460	.0500
11	SI		11.000		1.500		8.889		1.055
11 Coarse	MR		11.000		1.500		9.160		.920
11	MR		11.000		1.250		9.466		.767
11 Fine	MR		11.000		1.000		9.773		.613
11 Fine	MR		11.000		.750		10.080		.460
7/16	BSW	.4375		14		.3355		.0457
7/16	USS, NC, SB, 14N	.4375		14		.3447		.0464
7/16	UNRC, 14UNR	.4375		14		.3499		.0438
7/16	BSF	.4375		18		.3581		.0358
7/16	NF, 20N	.4375		20		.3725		.0325
7/16	UNRF, 20UNR	.4375		20		.3762		.0307
7/16	ADM	.4375		24		.3780		.0267
7/16	Sellers	.4375		24		.3834		.0271
7/16	CEI	.4375	11.113 mm	20		.3843		.0266
7/16	BSB	.4375		26		.3882		.0246
7/16	27N	.4375		27		.3894		.0241
7/16 (00000 USG)	28N, Ng	.4375		28		.3911		.0232
7/16	27UNR	.4375		27		.3921		.0227
7/16	UNREF, 28UNR	.4375		28		.3937		.0219
7/16	CEI	.4375		26		.3965		.0205
7/16	NEF, 32N	.4375		32		.3969		.0203
7/16	32UNR	.4375		32		.3992		.0192
-5	Thury		11.290		1.694		9.258		1.016
#30-14	Sellers	.4500		14		.3572		.0464
#30-16	Sellers	.4500		16		.3688		.0406
F	H & Co.	.4500		16.5
7/16	GAS	.4590		27
Candelabra	E	.46875		10		.4273		.0207
15/32	ABMA	.46875		32		.4282		.0203
15/32	ABMA	.46875		32		.4304		.0192
12	Rd 15403		12.000		3.000		8.700		1.650
12	Rd 405		12.000	10			9.460	.0500
12	SI		12.000		1.750		9.537		1.231
12	Delisle		12.000		1.600		9.600		1.200
12 Coarse	MR		12.000		1.750		9.853		1.074
12 Fine	MR	472.4 mils	12.000		1.500		10.160		.920
12 Fine	MR		12.000		1.250		10.467		.767
12MM	SPARK		12.000		1.000		10.701		.650
12 Fine	MR		12.000		1.000		10.773		.613
12	MR		12.000		.750		10.783		,460
Pg7	Panzerrohr		12.500	20			12.452	.0238
½	BSW	.5000		12		.3810		.0534
½	Sellers	.5000		12		.3917		.0541
½	UNRC	.5000		12		.3978		.0511
½	USS, NC, SB	.5000		13		.4001		.0500
½	UNR	.5000		13		.4056		.0472
½	14N	.5000		14		.4072		.0464
½	14UNR	.5000		14		.4124		.0438
½	BSF	.5000		16		.4107		.0400
½	ADM	.5000		20		.4286		.0320
½	NF, 20N	.5000		20		.4350		.0325
½	UNRF, 20UNR	.5000		20		.4387		.0307
½	BSB	.5000		26		.4407		.0246
½	Sellers	.5000		24		.4459		.0271
½	CEI	.5000		20		.4467		.0266
½	27N	.5000		27		.4519		.0241
½	NEF, 28N	.5000		28		.4536		.0232
½	27UNR	.5000		27		.4546		.0227
½	UNREF, 28UNR	.5000		28		.4562		.0219
½	CEI	.5000		26		.4590		.0205
½	32N	.5000		32		.4594		.0203
½	32UNR	.5000		32		.4617		.0192
E	H & Co.	.5000		13.09
-6	Thury		12.812		1.882		10.554		1.129
3/8"	BCT	.5140		20		.4500		.0320
½	GAS	.5150		27
¼"	BSPP	.5180		19		.4428		.0337
¼"	NPSM	.5260		18		.4538		.0361
¼"	WPIPE	.53125		19		.4638		.0337
14	Rd 15403		14.000		3.000		10.700		1.650
14	Rd 405		14.000	8			10.825	.0625
14	SI		14.000		2.000		11.185		1.407
14	Delisle		14.000		1.800		11.300		1.350
14 Coarse	MR		14.000		2.000		11.546		1.227
14 Fine	MR		14.000		1.500		12.160		.920
14MM	SPARK	551.2 mils	14.000		1.250		12.376		.812
14 Fine	MR		14.000		1.250		12.466		.767
14 Fine	MR		14.000		1.000		12.773		.613
14	E		14.000	9			12.831	.0230
D	H & Co.	.5600		13.09
9/16	BSW	.5625		12		.4435		.0534
9/16	USS, NC	.5625		12		.4542		.0541
9/16	UNRC	.5625		12		.4603		.0511
9/16	14N	.5625		14		.4697		.0464
9/16	14UNR	.5625		14		.4749		.0438
9/16	BSF	.5625		16		.4732		.0400
9/16	NF	.5625		18		.4903		.0361
9/16	ADM	.5625		20		.4911		.0320
9/16	UNRF	.5625		18		.4943		.0341
9/16	20N, Ng	.6250		20		.4975		.0325
9/16	NEF	.5625		24		.5084		.0271
9/16	CEI	.5625		20		.5092		.0266
9/16	20UNR	.5625		20		.5012		.0307
9/16	UNREF	.5625		24		.5114		.0256
9/16	BSB	.5625		26		.5132		.0246
9/16	27N	.5625		27		.5144		.0241
9/16	28N	.5625		28		.5161		.0232
9/16	27UNR	.5625		27		.5171		.0227
9/16	28UNR	.5625		28		.5187		.0219
9/16	CEI	.5625		26		.5215		.0205
9/16	32N	.5625		32		.5219		.0203
9/16	32UNR	.5625		32		.5242		.0192
9/16	CEI	.5625		30		.5270		.0178
-7	Thury		14.538		2.091		12.029		1.254
9/16	GAS	.5780		27
75/128	ABMA	.5859375		32		.5453		.0203
75/128	ABMA	.5859375		32		.5476		.0192
15 Fine	MR		15.000		1.500		13.160		.920
15 Fine	MR		15.000		1.000		13.773		.613
Pg9	Panzerrohr		15.200	18			15.147	.0265
5/8	BSW	.6250		11		.4951		.0582
5/8	USS, NC	.6250		11		.5069		.0590
5/8	UNRC	.6250		11		.5135		.0558
5/8	BSF	.6250		14		.5230		.0457
5/8	14N	.6250		14		.5322		.0464
5/8	14UNR	.6250		14		.5374		.0438
5/8	ADM	.6250		20		.5536		.0320
5/8	NF	.6250		18		.5528		.0361
5/8	UNRF	.6250		18		.5568		.0341
5/8	20N	.6250		20		.5600		.0325
5/8	20UNR	.6250		20		.5637		.0307
5/8	NEF	.6250		24		.5709		.0271
5/8	CEI	.6250		20		.5717		.0266
5/8	UNREF	.6250		24		.5739		.0256
5/8	BSB	.6250		26		.5757		.0246
5/8	27N	.6250		27		.5769		.0241
5/8	28N	.6250		28		.5786		.0232
5/8	27UNR	.6250		27		.5796		.0227
5/8	28UNR	.6250		28		.5812		.0219
5/8	CEI	.6250		26		.5840		.0205
5/8	32N	.6250		32		.5844		.0203
5/8	32UNR	.6250		32		.5867		.0192
DD	H & Co.	.6250		13.09
Intermediate	E	.65625		10		.6148		.0207
16	Rd 15403		16.000		4.000		11.600		2.200
16	Rd 405		16.000	8			12.825	.0625
16	Delisle		16.000		2.000		13.000		1.500
16	SI		16.000		2.000		13.185		1.407
16 Coarse	MR		16.000		2.000		13.546		1.227
16 Fine	MR		16.000		1.500		14.160		.920
16 Fine	MR		16.000		1.000		14.773		.613
5/8	GAS	.6370		27
½"	BCT	.6390		20		.5750		.0320
-8	Thury		16.498		2.323		13.710		1.394
3/8"	BSPP	.6560		19		.5808		.0337
3/8"	NPSM	.6620		18		.5898		.0361
85/128	ABMA	.6640625		32		.6234		.0203
85/128	ABMA	.6640625		32		.5457		.0192
17 Fine	MR		17.000		1.500		15.160		.920
17 Fine	MR		17.000		1.000		15.773		.613
11/16	BSW	.6875		11		.5576		.0582
11/16	USS	.6875		11		.5694		.0590
11/16	Sellers	.6875		12		.5792		.0541
11/16	BSF	.6875		14		.5855		.0457
11/16	14N	.6875		14		.5947		.0464
11/16	14UNR	.6875		14		.5999		.0438
11/16	Sellers	.6875		16		.6063		.0406
3/8"	WPIPE	.6875		19		.6201		.0337
11/16	ADM	.6875		20		.6161		.0320
11/16	CEI	.6875		20		.6342		.0266
11/16	20N	.6875		20		.6225		.0325
11/16	20UNR	.6875		20		.6262		.0307
11/16	UNREF	.6875		24		.6364		.0256
11/16	27N	.6875		27		.6394		.0241
11/16	28N	.6875		28		.6411		.0232
11/16	27UNR	.6875		27		.6421		.0227
11/16	28UNR	.6875		28		.6437		.0219
11/16	32N	.6875		32		.6469		.0203
11/16	32UNR	.6875		32		.6492		.0192
11/16	BSB	.6875		26		.6382		.0246
11/16	CEI	.6875		26		.6465		.0205
18	Rd 15403		18.000		4.000		13.600		2.200
18	SI		18.000		2.500		14.482		1.759
18	Delisle		18.000		2.200		14.700		1.650
18	Rd 405		18.000	8			14.825	.0625
18 Coarse	MR		18.000		2.500		14.933		1.534
18 Fine	MR		18.000		2.000		15.546		1.227
18MM	SPARK		18.000		1.500		16.051		.974
18 Fine	MR		18.000		1.500		16.160		.920
18 Fine	MR		18.000		1.000		16.773		.613
18	E		18.000	8.5			16.762	.0244
Pg11	Panzerrohr		18.600	18	18.574			.0265
-9	Thury		18.721		2.581		15.624		1.549
¾	BSW	.7500		10		.6072		.0640
¾	USS, NC	.7500		10		.6201		.0650
¾	UNRC	.7500		10		.6273		.0613
¾	BSF	.7500		12		.6310		.0534
¾	Sellers	.7500		12		.6417		.0541
¾	14UNR	.7500		14		.6624		.0438
¾	ADM	.7500		14		.6480		.0457
¾	NF	.7500		16		.6688		.0406
¾	UNRF	.7500		16		.6733		.0625
¾	NEF, 20N	.7500		20		.6850		.0325
¾	UNREF, 20UNR	.7500		20		.6887		.0307
¾	CEI	.7500		20		.6967		.0266
¾	BSB	.7500		26		.7007		.0246
¾	27N	.7500		27		.7019		.0241
¾	28N	.7500		28		.7036		.0232
¾	27UNR	.7500		27		.7046		.0227
¾	28UNR	.7500		28		.7062		.0219
¾	CEI	.7500		26		.7090		.0205
¾	32N	.7500		32		.7094		.0203
¾	32UNR	.7500		32		.7117		.0192
C	H & Co.	.7500		9.45
5/8"	BCT	.7640		20		.7000		.0320
¾	GAS	.7700		27
25/32	ABMA	.78125		32		.7407		.0203
25/32	ABMA	.78125		32		.7429		.0192
20	Rd 15403		20.000		4.000		15.600		2.200
20	Delisle		20.000		2.400		16.400		1.800
20	SI		20.000		2.500		16.482		1.759
20	Rd 405		20.000	8			16.825	.0625
20 Coarse	MR		20.000		2.500		16.933		1.534
20 Fine	MR		20.000		2.000		17.546		1.227
20 Fine	MR		20.000		1.500		18.160		.920
20 Fine	MR		20.000		1.000		18.773		.613
Pg13.5	Panzerrohr		20.400	18			20.347	.0265
13/16	BSW	.8125		10		.6697		.0640
13/16	ADM	.8125		14		.7105		.0457
13/16	NEF, 20N	.8125		20		.7475		.0325
13/16	UNREF, 20UNR	.8125		20		.7512		.0307
13/16	27N	.8125		27		.7644		.0241
13/16	28N	.8125		28		.7661		.0232
13/16	27UNR	.8125		27		.7671		.0227
13/16	28UNR	.8125		28		.7687		.0219
13/16	32N	.8125		32		.7719		.0203
13/16	32UNR	.8125		32		.7729		.0192
½"	NPSM	.8230		14		.7302		.0464
½"	BSPP	.8250		14		.7230		.0457
-10	Thury		21.244		2.868		17.803		1.721
½"	WPIPE	.84375		14		.7523		.0457
22	Rd 15403		22.000		4.000		17.600		2.200
22	Delisle		22.000		2.800		17.800		2.100
22	SI		22.000		2.500		18.482		1.759
22	Rd 405		22.000	8			18.825	.0625
22 Coarse	MR		22.000		2.500		18.933		1.534
22 Fine	MR		22.000		2.000		19.546		1.227
22 Fine	MR		22.000		1.500		20.160		.920
22 Fine	MR		22.000		1.000		20.773		.613
7/8	BSW	.8750		9		.7163		.0711
7/8	NC	.8750		9		.7307		.0722
7/8	UNRC	.8750		9		.7387		.0682
7/8	BSF	.8750		11		.7451		.0582
7/8	ADM	.8750		14		.7730		.0457
7/8	NF, 14N	.8750		14		.7822		.0464
7/8	UNRF, 14UNR	.8750		14		.7874		.0438
7/8	SPARK	.8750		18		.8028		.0361
7/8	NEF, 20N	.8750		20		.8100		.0325
7/8	UNREF, 20UNR	.8750		20		.8137		.0307
7/8	CEI	.8750		20		.8218		.0266
7/8	BSB	.8750		26		.8257		.0246
7/8	27N	.8750		27		.8269		.0241
7/8	28N	.8750		28		.8286		.0232
7/8	27UNR	.8750		27		.8296		.0227
7/8	CEI	.8750		24		.8306		.0222
7/8	28UNR	.8750		28		.8312		.0219
7/8	32N	.8750		32		.8344		.0203
7/8	32UNR	.8750		32		.8367		.0192
B	H & Co.	.8750		8.25
7/8	GAS	.8850		27
Pg16	Panzerrohr		22.500	18			22.447	.0265
¾"	BCT	.8890		20		.7125		.0320
5/8"	BSPP	.9020		14		.8000		.0457
15/16	BSW	.9375		9		.7788		.0711
15/16	ADM	.9375		14		.8355		.0447
5/8"	WPIPE	.9375		14		.8460		.0447
15/16	NEF, 20N	.9375		20		.8725		.0325
15/16	UNREF, 20UNR	.9375		20		.8762		.0307
15/16	27N	.9375		27		.8894		.0241
15/16	28N	.9375		28		.8911		.0232
15/16	27UNR	.9375		27		.8921		.0227
15/16	28UNR	.9375		28		.8937		.0219
15/16	32N	.9375		32		.8969		.0203
15/16	32UNR	.9375		32		.8992		.0192
24	Delisle		24.000		2.800		19.800		2.100
24	SI		24.000		3.000		19.778		2.111
24 Coarse	MR		24.000		3.000		20.319		1.840
24	Rd 405		24.000	8			20.825	.0625
24 Fine	MR		24.000		2.000		21.546		1.227
24 Fine	MR		24.000		1.500		22.160		.920
24 Fine	MR		24.000		1.000		22.773		.613
-11	Thury		24.107		3.187		20.283		1.912
31/32	ABMA	.96875		32		.9282		.0203
31/32	ABMA	.96875		32		.9304		.0192
31/32	CEI	.96875		30		.9332		.0178
25	Rd 15403		25.000		4.000		20.600		2.200
25 Fine	MR		25.000		2.000		22.546		1.227
25 Fine	MR		25.000		1.500		23.160		.920
25 Fine	MR		25.000		1.000		23.773		.613
1	BSW	1.0000		8		.8214		.0800
1	NC, 8N	1.0000		8		.8376		.0812
1	UNRC	1.0000		8		.8466		.0767
1	BSF	1.0000		10		.8572		.0640
1	ADM	1.0000		12		.8810		.0534
1	UNRF	1.0000		12		.8978		.0511
1	NF, 14N	1.0000		14		.9072		.0464
1	14UNR	1.0000		14		.9124		.0438
1	NEF, 20N	1.0000		20		.9350		.0325
1	UNREF, 20UNR	1.0000		20		.9387		.0307
1	BSB	1.0000		26		.9507		.0246
1	27N	1.0000		27		.9519		.0241
1	28N	1.0000		28		.9536		.0232
1	27UNR	1.0000		27		.9546		.0227
1	CEI	1.0000		24		.9557		.0222
1	28UNR	1.0000		28		.9562		.0219
1	CEI	1.0000		26		9590		.0205
1	32N	1.0000		32		.9594		.0203
1	32UNR	1.0000		32		.9617		.0192
1	CEI	1.0000		30		.9645		.0178
A	H & Co.	1.0000		6.58
1	GAS	1.0060		27
7/8"	BCT	1.0140		20		.8375		.0320
26	Delisle		26.000		3.200		21.200		2.400
26	Rd 405		26.000	8			22.825	.0625
26 Fine	MR		26.000		1.500		24.160		.920
¾"	NPSM	1.0340		14		.9412		.0464
¾"	BSPP	1.0410		14		.9390		.0457
1 1/16	ADM	1.0625		12		.9435		.0534
¾"	GHT	1.0625		11.5		.9495		.0565
1 1/16	UNRF	1.0625		12		.9603		.0511
¾"	WPIPE	1.0625		14		.9710		.0447
1 1/16	UNREF	1.0625		18		.9943		.0341
1 1/16	20N	1.0625		20		.9975		.0325
1 1/16	20UNR	1.0625		20		1.0012		.0307
Medium	E	1.0625		7		1.0033		.0296
1 1/16	28N	1.0625		28		1.0161		.0232
1 1/16	28UNR	1.0625		28		1.0187		.0219
27	SI		27.000		3.000		22.778		2.111
27 Coarse	MR		27.000		3.000		23.319		1.840
27 Fine	MR		27.000		2.000		24.546		1.227
27 Fine	MR		27.000		1.500		25.160		.920
27 Fine	MR		27.000		1.000		25.773		.613
-12	Thury		27.356		3.541		23.108		2.124
28	Delisle		28.000		3.200		23.200		2.400
28	Rd 15403		28.000		4.000		23.600		2.200
28	Rd 405		28.000	8			24.825	.0625
28 Fine	MR		28.000		2.000		25.546		1.227
28 Fine	MR		28.000		1.500		26.160		.920
28 Fine	MR		28.000		1.000		26.773		.613
Pg21	Panzerrohr		28.300	16			28.240	.0298
1 1/8	BSW	1.1250		7		.9209		.0915
1 1/8	UNRC	1.1250		7		.9497		.0876
1 1/8	BSF	1.1250		9		.9663		.0711
1 1/8	ADM	1.1250		12		1.0060		.0534
1 1/8	UNRF	1.1250		12		1.0228		.0511
1 1/8	14N	1.1250		14		1.0322		.0464
1 1/8	14UNR	1.1250		14		1.0374		.0438
1 1/8	UNREF	1.1250		18		1.0568		.0341
1 1/8	20N	1.1250		20		1.0600		.0325
1 1/8	20UNR	1.1250		20		1.0637		.0307
1 1/8	BSB	1.1250		26		1.0757		.0246
1 1/8	28N	1.1250		28		1.0786		.0232
1 1/8	28UNR	1.1250		28		1.0812		.0219
1"	BCT	1.1550		20		.9785		.0320
1 11/64	ABMA	1.171875		18		1.0997		.0361
1 11/64	ABMA	1.171875		18		1.1037		.0341
30	Delisle		30.000		3.600		24.600		2.700
30	SI		30.000		3.500		25.074		2.463
30 Coarse	MR		30.000		3.500		25.706		2.147
30 Fine	MR		30.000		3.000		26.319		1.840
30	Rd 405		30.000	8			26.825	.0625
30 Fine	MR		30.000		2.000		27.546		1.227
30 Fine	MR		30.000		1.500		28.160		.920
30 Fine	MR		30.000		1.000		28.773		.613
1 3/16	ADM	1.1875		12		1.0685		.0534
1 3/16	UNRF	1.1875		12		1.0853		.0511
1 3/16	UNREF	1.1875		18		1.1193		.0341
1 3/16	20N	1.1875		20		1.1225		.0325
1 3/16	20UNR	1.1875		20		1.1262		.0307
1 3/16	28N	1.1875		28		1.1411		.0232
1 3/16	28UNR	1.1875		28		1.1437		.0219
7/8"	BSPP	1.1890		14		1.0870		.0457
7/8"	WPIPE	1.21875		14		1.1273		.0447
-13	Thury		31.043		3.934		26.322		2.360
1¼	BSW	1.2500		7		1.0459		.0915
1¼	UNRC	1.2500		7		1.0747		.0876
1¼	BSF	1.2500		9		1.0913		.0711
1¼	ADM	1.2500		12		1.1310		.0534
1¼	UNRF	1.2500		12		1.1478		.0511
1¼	14N	1.2500		14		1.1572		.0464
1¼	14UNR	1.2500		14		1.1624		.0438
1¼	UNREF	1.2500		18		1.1818		.0341
1¼	BSB	1.2500		26		1.2007		.0246
1¼	20N	1.2500		20		1.1850		.0325
1¼	20UNR	1.2500		20		1.1887		.0307
1¼	28N	1.2500		28		1.2036		.0232
1¼	28UNR	1.2500		28		1.2062		.0219
32	Rd 15403		32.000		4.000		27.600		2.200
32	Delisle		32.000		3.600		28.600		2.700
32	Rd 405		32.000	8			28.825	.0625
32 Fine	MR		32.000		2.000		29.546		1.227
32 Fine	MR		32.000		1.500		30.160		.920
Designation, Size, or name	Thread Name or Series	Dia.	Dia.	Pitch	Pitch	Core Dia.	Core Dia.	Depth	Depth
Designation, Size, or name	Thread Name or Series	(Inch)	(mm)	(t.p.i.)	(mm)	(Inch)	(mm)	(Inch)	(mm)
1.29	CEI	1.2900		24		1.2457		.0222
1"	NPSM	1.2930		11.5		1.1800		.0565
33	SI		33.000		3.500		28.074		2.463
33 Coarse	MR		33.000		3.500		28.706		2.147
33 Fine	MR		33.000		3.000		29.319		1.840
33 Fine	MR		33.000		2.000		30.546		1.227
33 Fine	MR		33.000		1.500		31.160		.920
1"	BSPP	1.3090		11		1.1791		.0582
1 5/16	ADM	1.3125		12		1.1935		.0534
1 5/16	UNRF	1.3125		12		1.2103		.0511
1 5/16	ABMA	1.3125		18		1.2403		.0361
1 5/16	UNREF, ABMA	1.3125		18		1.2443		.0341
1 5/16	20N	1.3125		20		1.2475		.0325
1 5/16	20UNR	1.3125		20		1.2512		.0307
1 5/16	28N	1.3125		28		1.2661		.0232
1 5/16	28UNR	1.3125		28		1.2687		.0219
Admedium	E	1.3125		11.5		1.2765		.0180
34	Rd 405		34.000	8			30.825	.0625
1"	WPIPE	1.34375		11		1.2273		.0582
1.37	CEI	1.3700		24		1.3257		.0222
1 3/8	BSW	1.3750		6		1.1369		.1067
1 3/8	UNRC	1.3750		6		1.1705		.1022
1 3/8	BSF	1.3750		8		1.1964		.0800
¾", 1"	NH	1.3750		8		1.2126		.0812
1 3/8	ADM	1.3750		12		1.2560		.0534
1 3/8	UNRF	1.3750		12		1.2728		.0511
1 3/8	14N	1.3750		14		1.2822		.0464
1 3/8	14UNR	1.3750		14		1.2874		.0438
1 3/8	ABMA	1.3750		18		1.3028		.0361
1 3/8	UNREF, ABMA	1.3750		18		1.3068		.0341
1 3/8	20N	1.3750		20		1.3100		.0325
1 3/8	20UNR	1.3750		20		1.3137		.0307
1 3/8	28N	1.3750		28		1.3286		.0232
1 3/8	28UNR	1.3750		28		1.3312		.0219
1 3/8	E	1.3750		18		1.3520	.	.0115
35 Fine	MR		35.000		2.000		32.546		1.227
35 Fine	MR		35.000		1.500		33.160		.920
-14	Thury		35.227		4.371		29.981		2.623
1¼"	BCT	1.405		20		1.3410		.0320
36	Delisle		36.000		4.000		30.000		3.000
36	SI		36.000		4.000		30.371		2.815
36	Rd 15403		36.000		5.000		30.500		2.750
36 Coarse	MR		36.000		4.000		31.093		2.454
36 Fine	MR		36.000		3.000		32.319		1.840
36	Rd 405		36.000	8			32.825	.0625
36 Fine	MR		36.000		2.000		33.546		1.227
36 Fine	MR		36.000		1.500		34.160		.920
1 7/16	ADM	1.4375		12		1.3185		.0534
1 7/16	UNRF	1.4325		12		1.3353		.0511
1 7/16	UNREF	1.4375		18		1.3693		.0341
1 7/16	20N	1.4375		20		1.3725		.0325
1 7/16	20UNR	1.4375		20		1.3762		.0307
1 7/16	28N	1.4375		28		1.3911		.0232
1 7/16	CEI	1.4375		24		1.3932		.0222
1 7/16	28UNR	1.4375		28		1.3937		.0219
Pg29	Panzerrohr		37.000	16			36.940	.0298
38	Rd 405		38.000	8			34.825	.0625
38	MR		38.000		1.500		36.160		.920
1½	BSW	1.5000		6		1.2619		.1067
1½	UNRC	1.5000		6		1.2955		.1022
1½	BSF	1.5000		8		1.3214		.0800
1½	ADM	1.5000		12		1.3810		.0534
1½	UNRF	1.5000		12		1.3978		.0511
1½	14N	1.5000		14		1.4072		.0464
1½	14UNR	1.5000		14		1.4124		.0438
1½	UNREF	1.5000		18		1.4318		.0341
1½	BSB	1.5000		26		1.4507		.0246
1½	28N	1.5000		28		1.4536		.0232
1½	CEI	1.5000		24		1.4556		.0222
1½	28UNR	1.5000		28		1.4562		.0219
Mogul	E	1.5625		4		1.4589		.0518
1 9/16	ABMA	1.5625		18		1.4903		.0361
1 9/16	UNREF, ABMA	1.5625		18		1.4943		.0341
39	SI		39.000		4.000		33.371		2.815
39 Coarse	MR		39.000		4.000		34.093		2.454
39 Fine	MR		39.000		3.000		35.319		1.840
39 Fine	MR		39.000		2.000		36.546		1.227
39 Fine	MR		39.000		1.500		37.160		.920
-15	Thury		39.975		4.857		34.146		2.914
40	Delisle		40.000		4.400		33.400		3.300
40	Rd 15403		40.000		5.000		34.500		2.750
40	Rd 405		40.000	6			35.767	.0833
40 Fine	MR		40.000		3.000		36.319		1.840
40 Fine	MR		40.000		2.000		37.546		1.227
40 Fine	MR		40.000		1.500		38.160		.920
1 5/8	BSW	1.6250		5		1.3393		.1281
1 5/8	BSF	1.6250		8		1.4464		.0800
1 5/8	14N	1.6250		14		1.5322		.0464
1 5/8	14UNR	1.6250		14		1.5374		.0438
1 5/8	UNREF	1.6250		18		1.5018		.0341
1¼"	NPSM	1.6380		11.5		1.5250		.0565
1¼"	BSPP	1.6500		11		1.5201		.0582
42	SI		42.000		4.500		35.667		3.166
42 Coarse	MR		42.000		4.500		36.479		2.760
42	Rd 15403		42.000		5.000		36.500		2.750
42 Fine	MR		42.000		4.000		37.093		2.454
42	Rd 405		42.000	6			37.767	.0833
42 Fine	MR		42.000		3.000		38.319		1.840
42 Fine	MR		42.000		2.000		39.546		1.227
42 Fine	MR		42.000		1.500		40.160		.920
42	MR		42.000		.750		41.080		.460
1¼"	BCT	1.6550		20		1.5910		.0320
1¼"	NH	1.6710		9		1.5267		.0722
1¼"	WPIPE	1.6875		11		1.5711		.0582
1 11/16	UNREF	1.6875		18		1.6193		.0341
44	Rd 405		44.000	6			39.767	.0833
1 49/64	ABMA	1.765625		18		1.6935		.0361
1 49/64	ABMA	1.765625		18		1.6975		.0341
1¾	BSW	1.7500		5		1.4643		.1281
1¾	BSF	1.7500		7		1.5459		.0915
1¾	UNRC	1.7500		5		1.5046		.1227
1¾	14N	1.7500		14		1.6572		.0464
1¾	14UNR	1.7500		14		1.6624		.0438
1¾	UNREF	1.7500		16		1.6733		.0383
45	SI		45.000		4.500		38.667		3.166
45 Coarse	MR		45.000		4.500		39.479		2.760
45	Rd 15403		45.000		5.000		39.500		2.750
45 Fine	MR		45.000		4.000		40.093		2.454
45 Fine	MR		45.000		3.000		41.319		1.840
45 Fine	MR		45.000		2.000		42.546		1.227
45 Fine	MR		45.000		1.500		43.160		.920
-16	Thury		45.362		5.397		38.886		3.238
46	Rd 405		46.000	6			41.767	.0833
Pg36	Panzerrohr		47.000	16			46.940	.0298
1 7/8	BSW	1.8750		4.5		1.5576		.1423
1 7/8	14N	1.8750		14		1.7822		.0464
1 7/8	14UNR	1.8750		14		1.7874		.0438
1 7/8	E	1.8750		13.75		1.8449		.0151
1½"	NPSM	1.8770		11.5		1.7640		.0565
1½"	BSPP	1.8820		11		1.7521		.0582
48	SI		48.000		4.500		40.964		3.518
48 Coarse	MR		48.000		5.000		41.866		3.067
48	Rd 15403		48.000		5.000		42.500		2.750
48 Fine	MR		48.000		4.000		43.093		2.454
48	Rd 405		48.000	6			43.767	.0833
48 Fine	MR		48.000		3.000		44.319		1.840
48 Fine	MR		48.000		2.000		45.546		1.227
48 Fine	MR		48.000		1.500		46.160		.920
1½"	WPIPE	1.90625		11		1.7898		.0582
1¾"	BCT	1.9290		16		1.8490		.0400
50	Rd 15403		50.000		5.000		44.500		2.750
50	Rd 405		50.000	6			45.767	.0833
50 Fine	MR		50.000		3.000		46.319		1.840
50 Fine	MR		50.000		2.000		47.546		1.227
50 Fine	MR		50.000		1.500		48.160		.920
1 31/32	ABMA	1.96875		18		1.8966		.0361
1 31/32	ABMA	1.96875		18		1.9006		.0341
1½"	NH	1.9900		9		1.8457		.0722
2	BSW	2.0000		4.5		1.6826		.1423
2	UNRC	2.0000		4.5		1.6835		.1582
2	BSF	2.0000		7		1.7959		.0915
2	14N	2.0000		14		1.9072		.0464
2	14UNR	2.0000		14		1.9124		.0438
2	UNREF	2.0000		16		1.9233		.0383
-17	Thury		51.476		5.996		44.280		3.598
52	SI		52.000		4.500		44.964		3.518
52 Coarse	MR		52.000		5.000		45.866		3.067
52 Fine	MR		52.000		4.000		47.093		2.454
52	Rd 405		52.000	6			47.767	.0833
52 Fine	MR		52.000		3.000		48.319		1.840
52 Fine	MR		52.000		2.000		49.546		1.227
52 Fine	MR		52.000		1.500		50.160		.920
53	Rd 15403		53.000		5.000		47.500		2.750
1¼"	BSPP	2.1160		11		1.9861		.0582
Pg42	Panzerrohr		54.000	16			53.940	.0298
1¾"	WPIPE	2.15625		11		2.0398		.0582
2 5/32	ABMA	2.15625		18		2.0841		.0361
55 Fine	MR		55.000		4.000		50.093		2.454
55	Rd 405		55.000	6			50.767	.0833
55 Fine	MR		55.000		3.000		51.319		1.840
55 Fine	MR		55.000		2.000		52.546		1.227
55 Fine	MR		55.000		1.500		53.160		.920
2"	BCT	2.1790		16		2.0990		.0400
2 13/64	ABMA	2.203125		18		2.1310		.0361
56	SI		56.000		5.500		48.260		3.870
56 Coarse	MR		56.000		5.500		49.252		3.374
56	Rd 15403		56.000		5.000		50.500		2.750
56 Fine	MR		56.000		4.000		51.093		2.455
56 Fine	MR		56.000		3.000		52.319		1.840
56 Fine	MR		56.000		2.000		53.546		1.227
56 Fine	MR		56.000		1.500		54.160		.920
2¼	BSW	2.2500		4		1.8929		.1601
2¼	BSF	2.2500		6		2.0119		.1067
2¼	UNRC	2.2500		4.5		1.9774		.1363
2¼	14N	2.2500		14		2.1572		.0464
2¼	14UNR	2.2500		14		2.1624		.0438
58	Rd 405		58.000	6			53.767	.0833
58 Fine	MR		58.000		4.000		55.093		2.454
58 Fine	MR		58.000		3.000		54.319		1.840
58 Fine	MR		58.000		2.000		55.546		1.227
58 Fine	MR		58.000		1.500		56.160		.920
-18	Thury		58.413		6.662		50.419		3.997
Pg48	Panzerrohr		59.300	16			59.240	.0298
2"	BSPP	2.3470		11		2.2171		.0582
F48	Panzerrohr	2.3470		11		2.2604		.0298
2"	NPSM	2.3510		11.5		2.2380		.0565
2 23/64	ABMA	2.359375		18		2.2872		.0361
60	SI		60.000		5.500		52.260		3.870
60	Rd 15403		60.000		6.000		53.400		3.300
60 Coarse	MR		60.000		5.500		53.252		3.374
60 Fine	MR Fine		60.000		4.000		55.093		2.454
60	Rd 405		60.000	6			55.767	.0833
60 Fine	MR		60.000		3.000		56.319		1.840
60 Fine	MR		60.000		2.000		57.546		1.227
60 Fine	MR		60.000		1.500		58.160		.920
2"	WPIPE	2.3750		11		2.2586		.0582
2 13/32	ABMA	2.40625		18		2.3341		.0361
2¼"	BCT	2.4290		16		2.3490		.0400
62	Rd 405		62.000	6			54.639	.0833
62 Fine	MR		62.000		4.000		57.093		2.454
62 Fine	MR		62.000		3.000		58.319		1.840
62 Fine	MR		62.000		2.000		59.546		1.227
62 Fine	MR		62.000		1.500		60.160		.920
63	Rd 15403		63.000		6.000		56.400		3.300
2½	BSW	2.5000		4		2.1429		.1601
2½	NC, 4N	2.5000		4		2.1752		.1624
2½	UNRC, 4UNR	2.5000		4		2.1933		.1534
2½	BSF	2.5000		6		2.2619		.1067
2½	14N	2.5000		14		2.4072		.0464
2½	14UNR	2.5000		14		2.4124		.0438
2"	NH	2.5150		8		2.3526		.0812
64	SI		64.000		6.000		55.556		4.222
64 Coarse	MR		64.000		6.000		56.639		3.681
64 Fine	MR		64.000		4.000		59.093		2.454
64 Fine	MR		64.000		3.000		60.319		1.840
64 Fine	MR		64.000		2.000		63.546		1.227
64 Fine	MR		64.000		1.500		62.160		.920
2 35/64	ABMA	2.546875		18		2.4747		.0361
65 Fine	MR		65.000		4.000		60.093		2.454
65	Rd 405		65.000	6			60.767	.0833
65 Fine	MR		65.000		3.000		61.319		1.840
65 Fine	MR		65.000		2.000		62.546		1.227
65 Fine	MR		65.000		1.500		63.160		.920
-19	Thury		66.286		7.403		57.403		4.442
2¼"	WPIPE	2.6250		11		2.5086		.0582
2 5/8	4N	2.6250		4		2.3002		.1624
2 5/8	4UNR	2.6250		4		2.3183		.1534
2 5/8	ABMA	2.6250		18		2.5528		.0361
67	Rd 15403		67.000		6.000		60.400		3.300
68	SI		68.000		6.000		59.556		4.222
68 Coarse	MR		68.000		6.000		60.639		3.681
68 Fine	MR		68.000		4.000		63.093		2.454
68	Rd 405		68.000	6			63.767	.0833
68 Fine	MR		68.000		3.000		64.319		1.840
68 Fine	MR		68.000		2.000		65.546		1.227
68 Fine	MR		68.000		1.500		66.160		.920
2½"	BCT	2.6790		16		2.5990		.0400
2¾	BSW	2.7500		3.5		2.3419		.1830
2¾	NC, 4N	2.7500		4		2.4252		.1624
2¾	UNRC, 4UNR	2.7500		4		2.4433		.1534
2¾	BSF	2.7500		6		2.5119		.1067
2¾	14N	2.7500		14		2.6572		.0464
2¾	14UNR	2.7500		14		2.6624		.0438
2¾	ABMA	2.7500		18		2.6778		.0361
70	Rd 15403		70.000		6.000		63.400		3.300
70 Coarse	MR		70.000		6.000		62.639		3.681
70 Fine	MR		70.000		4.000		65.093		2.454
70 Fine	MR		70.000		3.000		66.319		1.840
70 Fine	MR		70.000		2.000		67.546		1.227
70 Fine	MR		70.000		1.500		68.160		.920
72	SI		72.000		6.500		62.853		4.574
72 Coarse	MR		72.000		6.000		64.639		3.681
72 Fine	MR		72.000		4.000		67.093		2.454
72	Rd 405		72.000	6			67.767	.0833
72 Fine	MR		72.000		3.000		68.319		1.840
72 Fine	MR		72.000		2.000		69.546		1.227
72 Fine	MR		72.000		1.500		70.160		.920
2½"	NPSM	2.8410		8		2.6786		.0812
2 7/8	4N	2.8750		4		2.5502		.1624
2 7/8	4UNR	2.8750		4		2.5683		.1534
2¾"	BCT	2.9290		16		2.8490		.0400
2 15/16	ABMA	2.9375		12		1.8292		.0541
75 Coarse	MR		75.000		6.000		67.639		3.681
75	Rd 15403		75.000		6.000		68.400		3.300
75 Fine	MR		75.000		4.000		70.093		2.454
75	Rd 405		75.000	6			70.767	.0833
75 Fine	MR		75.000		3.000		71.319		1.840
75 Fine	MR		75.000		2.000		72.546		1.227
75 Fine	MR		75.000		1.500		73.160		.920
-20	Thury		75.220		8.225		65.349		4.935
76	SI		76.000		6.500		66.853		4.574
3	USS	3.0000		3.5		2.6288		.1856
3	NC, 4N	3.0000		4		2.6752		.1624
3	UNRC, 4UNR	3.0000		4		2.6933		.1534
3	14N	3.0000		14		2.9072		.0464
3	14UNR	3.0000		14		2.9124		.0438
2½"	WPIPE	3.0000		11		2.8836		.0582
2½"	NH	3.0686		8		2.9062		.0812
reference	MR, UNR	1.226869322		1		0		.613434466
Designation, Size, or name	Thread Name or Series	Dia.	Dia.	Pitch	Pitch	Core Dia.	Core Dia.	Depth	Depth
Designation, Size, or name	Thread Name or Series	(Inch)	(mm)	(t.p.i.)	(mm)	(Inch)	(mm)	(Inch)	(mm)
80	SI		80.000		7.000		70.149		4.926
3"	BCT	3.2030		16		3.1230		.0400
3¼	USS	3.2500		3.5		2.8788		.1856
-21	Thury		85.357		9.139		74.390		5.484
3½	USS	3.5000		3.25		3.1003		.1999
3¾	USS	3.7500		3		3.3170		.2165
-22	Thury		96.861		10.155		84.675		6.093
4	USS	4.0000		3		3.5670		.2165
4¼	USS	4.2500		2.875		3.5482		.2259
-23	Thury		109.915		11.283		96.376		6.770
4½	USS	4.5000		2.75		4.0276		.2362
4¾	USS	4.7500		2.625		4.2551		.2474
-24	Thury		124.729		12.537		109.685		7.522
5	USS	5.0000		2.5		4.4804		.2598
5¼	USS	5.2500		2.5		4.7304		.2598
5½	USS	5.5000		2.375		4.9530		.2735
-25	Thury		141.539		13.930		124.823		8.358
5¾	USS	5.7500		2.375		5.2030		.2735
6	USS	6.0000		2.25		5.4226		.2887

Notes on Methods Used:

The second column contains thread-form names which are descriptive, but no attempt has been made to list all the official names. Joseph Whitworth, William Sellers, Karl Delisle and Thury proposed thread forms and screw series that have been known in many countries and by many names.
The second column also contains some examples of thread series which include a particular screw. No attempt at thoroughness has been made. The series listed exist, though some are not government sanctioned. The 10 t.p.i. and 14 t.p.i. constant-pitch series are two examples.
Columns are sorted firstly by Major Diameter, secondly by Minor Diameter.
With some threads the external and internal versions have different basic forms. In these cases the table reflects the "primary" form; the "derivative" form is neglected. Usually the "primary" form is the external, in the case of the Edison Thread, it is the internal.
All entries new to this edition were figured on a Radio Shack EC-4023 scientific calculator (please excuse any typos;-). The diagrams were printed and served as a handy reference.
<shameless plug>
For years "The GiMP" has been my graphics program of choice. http://www.gimp.org
</shameless plug>
Here are links to the thread form diagrams: (bitmaps, 4.052MB each)
Acme 29° · British Association · Cycle Engineers Institute · Delisle · Edison · Knuckle Thread · Panzerrohrgewinde · Round Thread (DIN 405) · Round Thread (DIN 15403) · Sellers · Système International · Thury · UNJ · UNR · Whitworth

Notes on Whitworth bolts and screws:

The "Dia. (Inch)" column contains diameters of unthreaded stock; f.ex.: the shank of the bolt.
The Major Diameters of threaded portions sre slightly smaller and are given by D_shank-(.147835136·p).
This must be remembered when trying to identify war-era fasteners.
The additional Crest Shortening is equal to the Rounding Height of crests (also the Rounding Depth of roots).
All this has no effect on Thread Depth; it only deals with the "radial displacement" of the threads from the axis of the fastener's cylinder.
(this form: per BSI No. 84, 1940)
British pipe threads are simpler; threaded portions have the quoted Major Diameter while unthreaded pipe diameters vary slightly from one sample to another.
(this form: per BSI No. 84, 1940)

Notes on the Unified National thread form:

The basic Unified National form does not specify the shape of the root. Thread Depth and Minor Diameter depend on the root shape!
For flat roots, the Thread Depth is given by .541265877·p and Minor Diameter is given by D-(1.082531755·p).
The "R" variant specifies a root radius of .144337567·p, and so, it is the form described here.
The "R" variant thread depth is given by sin60·¹⁷/₂₄·p

Notes on the Unified National High-Strength thread form:

The UNJ standard specifies a Root Radius of .180421958·p.
The Thread Depth is given by sin60·²/₃·p
The UNJ form originated with the Society of Automotive Engineers. I don't know if they specified the root's form.
For flat roots, the Thread Depth is given by .487139289·p and Minor Diameter is given by D-(.974278579·p).

---- Afterthoughts: ----

After two months of research I finally identified those 2.9 mm and 3.4 mm computer screws! This page simply records what I learned along the way.
I know that some series extend to larger or smaller diameters than are shown here; I simply lack the information.
Karl Delisle first proposed his thread form in 1876. In 1894 Dr. Löwenherz proposed a fastener series which used Delisle's thread form. There seem to be two variants of the form: one with rounded roots and one with flat roots as described on this page.
John J. Holtzapffel was a master lathe designer and builder; his series was designed to facilitate the cutting of threads. The Pitches are produced by various combinations of change-wheels working in conjunction with the standard Holtzapffel lathe nose thread of approximately 9.45 t.p.i.
H & Co. offered tools for cutting shallow (called 50°) and deep (called either 60° or 70°) threads. It would seem that, in current terminology, these figures correspond to Flank Angles of 80° and 60° or 40° respectively.
The thread tools were numbered from 1 to 12. The tap tools were designated by letters. An internal thread might be described as "tap C, thread No. 3". Roots and crests were not specified and varied according to tool wear and the machinist's habbit.
Begining in the 1840s, tools were offered for producing threads with pitches of even fractions of an English Inch.
The "Self-Tapping & Thread-Forming" group includes two broad catagories of thread-cutting and thread-forming screws:
-ST; "Spaced-Thread"; broad roots, varoius screw tips
-TF; "Thread Forming" (aka "Thread Rolling"); (e.g. Tap-Tite®), thread form is similar to machine screws, various screw tips
Some threads are very difficult to research:
-Edison Thread: Czech form, diameters and pitches from various sources and real-world measurments.
-"old French": appears to have Wm. Sellers' form, with fasteners having metric measurments
-"Self-Tapping & Thread-Forming": radii are as shown on Australian diagrams, diameters and pitches from the ISO specification and real-world measurments. These are not precision fasteners. The averaged form shown here is usually within official tolerances. Quite often, actual screws are not.
-SI Thread: Most diagrams disagree with each other and individual diagrams often contain conflicting measurments. I have heard of three forms, all called "SI": Professor Sauvage's series with a form identical to Wm. Sellers' thread, one with flat roots and rounded crests, and the variant shown here with both roots and crests rounded.
Unified National (High-Strength form) fasteners are not included, save for the Miniature series (e.g. UNM).
For each of the official Unified National diameter/pitch combinations there is a corresponding high-strength version.
"Thury" threads are the basis for British Association threads. Professor Marc Thury lead a conference that adopted this series in 1876. It was published in "Systématique des vis horologères" in 1878. Here's my take on Thury threads:
> During the 1800s it made sense to list ideal values and instruct manufacturers to come as close as possible. To wit:
> Flank Angle = 47½°
> Thread Depth = .6·P
> Crests and Roots are smoothly rounded.
> Pitch in millimeters = .9 x^y size#
> Other thread-form parameters are derivative.
> There are many lists of Thury diameters. Although they mirror each other perfectly, those diameters cannot be described by a simple equasion. The diameters listed here were obtained from the following equasion:
Diameter in millimeters = 6·((.9x^ysize#)·(.9x^y(size#/5)))
One often reads that Thury and BA fasteners are designed so that the Minor Diameter of a given screw equals the Major Diameter of the next smaller screw. This is incorrect! Pitches and diameters do not change at the same rate.
> Major Diameter = .881233526 × the next larger diameter.
British Association threads are defined thusly:
> Flank Angle = 47½°
> Crests and Roots are smoothly rounded.
> Root and Crest Radii were originally specified as 2/11·p and later as .1808346·p.
> Other thread-form parameters are derivative.
> The official Diameters and Pitches are rounded to two decimal places on a per-size basis.
Tapered threads are not included in this listing.
The American thread-forming screws are not included here.
The various Whitworth and metric constant-pitch series are not included here due to a lack of information.
The Unified National Fine series ends at 1½".
The United States Standard series (USS) specifies one pitch per diameter. It pre-dates the American National Coarse series. Beginning with 3-inch bolts, the pitches are coarser than the NC series.
The generic "Sellers" designation includes SAE Regular, SAE Fine, ASME Standard, ASME Special (aka Fine), Stove Bolt and other series not specifically identified as well as fasteners which belong to no standardized series.
The Unified National Extra Fine series begins with size #12.
Though a wide variety of American National Form and Unified National Form 27 t.p.i. taps and dies are available, I have found no references to 27 t.p.i. or 32 t.p.i. "gas threads", save for the original versions of this page. The "Gas Brass" series of Britain is another name for British Standard Brass (aka BSB).
The bicycle and motorcycle threads of many countries are, in fact, subsets of CEI/BSCy.
Oh, for an HTML-to-spreadsheet converter!
Best viewed @ 1024x768:-/

Original compilation by Andy Pugh of Bodgesoc Industries, Sheffield, UK	email a.c.pugh@sheffield.ac.uk
Additions and layout by Ian W. Wright, Sheffield, UK	email: ian@iw63.freeserve.co.uk

This compilation by Pete Randolph of Lamoille County, Vermont-- email geminga@theinternet.com/google

The data presented here was found freely available on the internet from:

British, German, American, Czech, Australian, Japanese, Korean, French and Estonian sources The only printed source consulted was, for what it was worth: the Standard Handbook for Mechanical Engineers, Seventh Edition by Baumeister & Marks (McGraw-Hill, 1967)

Thury	•	Swiss Instrument Thread	Sellers	•	American National Thread
SI	•	Système International (Fra. & Deu.)	W.INS	•	Whitworth Instrument
SPARK	•	Spark Plug threads	WALTH		Waltham Clock thread
Rd 405	•	Round Thread, DIN 405	BSW	•	British Standard Whitworth
NPSM	•	Am. Nat'l Str. Pipe, Mechan'l	UNR, MR	•	Unified National (Rounded Roots)
ADM	•	Admiralty Fine Thread	SB	•	Stove Bolt
CROWN		watch crown threads	BSF	•	British Standard Fine
Ng	•	Nähmaschinengewinde (sewing mach. thread)	GAS		Gas (Brass Pipe) thread
BSPP	•	British Standard Pipe, Parallel	Pg	•	Stahlpanzerrohrgewinde (steel conduit thread)
BUTTON		watch button threads	WPIPE	•	Whitworth Pipe thread
Rd 20400	•	Round Thread, DIN 20400	USF	•	United States Form
H & Co		Holtzapffel & Co. Thread	ELGIN		Elgin watch screws
BSB	•	British Standard Brass thread	Delisle	•	Delisle Thread (aka Löwenherz, VDI)
PEND		watch pendant threads	CEI, Fg	•	Cycle Engineers Institute
UNM	•	Unified National (High-Strength)	PROG		Progress Clock thread
BA	•	British Association	E	•	Edison Thread
Rd 15403	•	Round Thread, DIN 15403	USS	•	United States Standard