A Compilation of Thread Size Information
Key:
BA = British association. CEI = Cycle Engineers
Institute. ADM = Admiralty. M = ISO Metric.
Whit = Whitworth. UNF/UNC = Unified national Fine/Coarse. BSF = British Standard
Fine.
W.INS = Whitworth Instrument. W.Pipe = Whitworth Pipe Thread Brass = Brass
thread.
PROG = Progress Thread. BSP = British Standard Pipe Thread. WALTH = Waltham
Thread
PEND = Watch Pendant Thread. GAS = Gas (Brass Pipe) Thread THURY = Swiss Screw
Thread.
ASME = ASME Thread. HOLTZ= Holtzapfels Threads. LOEW = Loewenhertz Threads.
SPARK = Spark Plug Threads. Elgin = Elgin watch screw threads (L = left hand
thread)
CROWN = Watch crown threads. BUTTON = Watch button threads
COND = Steel conduit thread (DIN 40430)
DUNLOP = Tire valves.
EDISON = Lamp socket thread
V = Sharp V thread
S&H = Siemens & Halske
| Size | Thread | Dia/ | Dia/ | Pitch/ | Pitch/ | Core | Core | Depth/ | Depth/ | Thread | |||
| Designation | Name | Inch | mm | TPI | mm | Dia/" | Dia/mm | Inch | mm | Angle | |||
| 10 | W.INS | 0.0100 | 0.254 | 400.0 | 0.064 | 0.0068 | 0.173 | 0.0016 | 0.041 | 55º | |||
| 25 | THURY | 0.0100 | 0.254 | 353.8 | 0.072 | 47½º | |||||||
| 11 | W.INS | 0.0110 | 0.279 | 400.0 | 0.064 | 0.0078 | 0.198 | 0.0016 | 0.041 | 55º | |||
| 24 | THURY | 0.0114 | 0.289 | 318.3 | 0.080 | 47½º | |||||||
| 12 | W.INS | 0.0120 | 0.305 | 350.0 | 0.073 | 0.0083 | 0.212 | 0.0018 | 0.046 | 55º | |||
| 23 | THURY | 0.0129 | 0.328 | 286.7 | 0.089 | 47½º | |||||||
| 23 | BA | 0.0130 | 0.330 | 282.2 | 0.090 | 0.0087 | 0.220 | 0.0022 | 0.055 | 47½º | |||
| 13 | W.INS | 0.0130 | 0.330 | 350.0 | 0.073 | 0.0093 | 0.237 | 0.0018 | 0.046 | 55º | |||
| Elgin | 0.0132 | 0.330 | 360.0 | 0.071 | 0.0112 | 0.280 | 45º ¹ | ||||||
| 23 | WALTH | 0.0138 | 0.350 | 254.0 | 0.100 | 0.0107 | 0.270 | 0.0016 | 0.040 | 45º ¹ | |||
| 14 | W.INS | 0.0140 | 0.356 | 300.0 | 0.085 | 0.0097 | 0.247 | 0.0021 | 0.054 | 55º | |||
| 22 | BA | 0.0146 | 0.370 | 259.2 | 0.098 | 0.0098 | 0.250 | 0.0024 | 0.060 | 47½º | |||
| 22 | THURY | 0.0146 | 0.372 | 257.9 | 0.099 | 47½º | |||||||
| Elgin | 0.0148 | 0.370 | 320.0 | 0.079 | 0.0120 | 0.280 | 0.0014 | 0.036 | 45º ¹ | ||||
| 15 | W.INS | 0.0150 | 0.381 | 300.0 | 0.085 | 0.0107 | 0.273 | 0.0021 | 0.054 | 55º | |||
| 4 | PROG | 0.0157 | 0.400 | 254.0 | 0.100 | 0.0094 | 0.240 | 0.0031 | 0.080 | 50º | |||
| 16 | W.INS | 0.0160 | 0.406 | 300.0 | 0.085 | 0.0117 | 0.298 | 0.0021 | 0.054 | 55º | |||
| 21 | BA | 0.0165 | 0.420 | 230.9 | 0.110 | 0.0114 | 0.290 | 0.0026 | 0.065 | 47½º | |||
| 21 | THURY | 0.0168 | 0.426 | 233.0 | 0.109 | 47½º | |||||||
| Elgin | 0.0168 | 0.420 | 260.0 | 0.098 | 0.0132 | 0.330 | 0.0018 | 0.046 | 45º ¹ | ||||
| 17 | W.INS | 0.0170 | 0.432 | 250.0 | 0.102 | 0.0119 | 0.302 | 0.0026 | 0.065 | 55º | |||
| 21 | WALTH | 0.0177 | 0.450 | 240.0 | 0.106 | 0.0134 | 0.340 | 0.0022 | 0.055 | 45º ¹ | |||
| 4 1/ 2 | PROG | 0.0177 | 0.450 | 254.0 | 0.100 | 0.0114 | 0.290 | 0.0031 | 0.080 | 50º | |||
| 18 | W.INS | 0.0180 | 0.457 | 250.0 | 0.102 | 0.0129 | 0.327 | 0.0026 | 0.065 | 55º | |||
| 20 | THURY | 0.0189 | 0.479 | 208.2 | 0.122 | 47½º | |||||||
| 20 | BA | 0.0189 | 0.480 | 211.7 | 0.120 | 0.0134 | 0.340 | 0.0028 | 0.070 | 47½º | |||
| 19 | W.INS | 0.0190 | 0.483 | 250.0 | 0.102 | 0.0139 | 0.353 | 0.0026 | 0.065 | 55º | |||
| 5 | PROG | 0.0197 | 0.500 | 203.2 | 0.125 | 0.0118 | 0.300 | 0.0039 | 0.100 | 50º | |||
| 20 | W.INS | 0.0200 | 0.508 | 210.0 | 0.121 | 0.0139 | 0.353 | 0.0030 | 0.077 | 55º | |||
| Elgin | 0.0208 | 0.520 | 220.0 | 0.115 | 0.0168 | 0.420 | 0.0020 | 0.051 | 45º ¹ | ||||
| 19 | BA | 0.0213 | 0.540 | 181.4 | 0.140 | 0.0146 | 0.370 | 0.0033 | 0.085 | 47½º | |||
| 19 | THURY | 0.0214 | 0.543 | 188.1 | 0.135 | 47½º | |||||||
| 19 | WALTH | 0.0217 | 0.550 | 220.0 | 0.115 | 0.0177 | 0.450 | 0.0020 | 0.050 | 45º ¹ | |||
| 5 1/ 2 | PROG | 0.0217 | 0.550 | 203.2 | 0.125 | 0.0138 | 0.350 | 0.0039 | 0.100 | 50º | |||
| 22 | W.INS | 0.0220 | 0.559 | 210.0 | 0.121 | 0.0159 | 0.404 | 0.0030 | 0.077 | 55º | |||
| Elgin | 0.0228 | 0.570 | 260.0 | 0.098 | 0.0188 | 0.470 | 0.0020 | 0.051 | 45º ¹ | ||||
| 6 | PROG | 0.0236 | 0.600 | 169.3 | 0.150 | 0.0142 | 0.360 | 0.0047 | 0.120 | 50º | |||
| 24 | W.INS | 0.0240 | 0.610 | 210.0 | 0.121 | 0.0179 | 0.455 | 0.0030 | 0.077 | 55º | |||
| 18 | THURY | 0.0243 | 0.616 | 169.3 | 0.150 | 47½º | |||||||
| 18 | BA | 0.0244 | 0.620 | 169.3 | 0.150 | 0.0173 | 0.440 | 0.0035 | 0.090 | 47½º | |||
| Elgin | 0.0248 | 0.620 | 220.0 | 0.115 | 0.0200 | 0.500 | 0.0024 | 0.061 | 45º ¹ | ||||
| 17 | WALTH | 0.0256 | 0.650 | 200.0 | 0.127 | 0.0213 | 0.540 | 0.0022 | 0.055 | 45º ¹ | |||
| 6 1/ 2 | PROG | 0.0256 | 0.650 | 169.3 | 0.150 | 0.0161 | 0.410 | 0.0047 | 0.120 | 50º | |||
| 26 | W.INS | 0.0260 | 0.660 | 180.0 | 0.141 | 0.0189 | 0.480 | 0.0036 | 0.090 | 55º | |||
| Elgin | 0.0268 | 0.670 | 180.0 | 0.141 | 0.0220 | 0.550 | 0.0024 | 0.061 | 45º ¹ | ||||
| 17 | THURY | 0.0275 | 0.699 | 152.1 | 0.167 | 47½º | |||||||
| 17 | BA | 0.0276 | 0.700 | 149.4 | 0.170 | 0.0197 | 0.500 | 0.0039 | 0.100 | 47½º | |||
| 7 | PROG | 0.0276 | 0.700 | 145.1 | 0.175 | 0.0165 | 0.420 | 0.0055 | 0.140 | 50º | |||
| 28 | W.INS | 0.0280 | 0.711 | 180.0 | 0.141 | 0.0209 | 0.531 | 0.0036 | 0.090 | 55º | |||
| Elgin | 0.0288 | 0.720 | 220.0 | 0.115 | 0.0248 | 0.620 | 0.0020 | 0.051 | 45º ¹ | ||||
| 7 1/ 2 | PROG | 0.0295 | 0.750 | 145.1 | 0.175 | 0.0185 | 0.470 | 0.0055 | 0.140 | 50º | |||
| 30 | W.INS | 0.0300 | 0.762 | 180.0 | 0.141 | 0.0229 | 0.581 | 0.0036 | 0.090 | 55º | |||
| 12 Swiss | BUTTON | 0.0300 | 0.760 | 140.0 | 0.181 | ||||||||
| Elgin | 0.0308 | 0.770 | 180.0 | 0.141 | 0.0248 | 0.620 | 0.0030 | 0.076 | 45º ¹ | ||||
| Elgin | 0.0308 | 0.770 | 220.0 | 0.115 | 0.0268 | 0.670 | 0.0020 | 0.051 | 45º ¹ | ||||
| 16 | BA | 0.0311 | 0.790 | 133.7 | 0.190 | 0.0220 | 0.560 | 0.0045 | 0.115 | 47½º | |||
| 16 | THURY | 0.0313 | 0.794 | 137.3 | 0.185 | 47½º | |||||||
| 8 | PROG | 0.0315 | 0.800 | 127.0 | 0.200 | 0.0189 | 0.480 | 0.0063 | 0.160 | 50º | |||
| 32 | W.INS | 0.0320 | 0.813 | 180.0 | 0.141 | 0.0249 | 0.632 | 0.0036 | 0.090 | 55º | |||
| 15 | WALTH | 0.0327 | 0.830 | 180.0 | 0.141 | 0.0280 | 0.710 | 0.0024 | 0.060 | 45º ¹ | |||
| 11 Swiss | BUTTON | 0.0330 | 0.840 | 140.0 | 0.181 | ||||||||
| 8 1/ 2 | PROG | 0.0335 | 0.850 | 127.0 | 0.200 | 0.0209 | 0.530 | 0.0063 | 0.160 | 50º | |||
| 34 | W.INS | 0.0340 | 0.864 | 150.0 | 0.169 | 0.0255 | 0.647 | 0.0043 | 0.108 | 55º | |||
| 10A Swiss | BUTTON | 0.0340 | 0.860 | 110.0 | 0.231 | ||||||||
| 10 Swiss | BUTTON | 0.0350 | 0.890 | 110.0 | 0.231 | ||||||||
| 15 | BA | 0.0354 | 0.900 | 121.0 | 0.210 | 0.0256 | 0.650 | 0.0049 | 0.125 | 47½º | |||
| 9 | PROG | 0.0354 | 0.900 | 112.9 | 0.225 | 0.0213 | 0.540 | 0.0071 | 0.180 | 50º | |||
| 15 | THURY | 0.0355 | 0.901 | 123.3 | 0.206 | 47½º | |||||||
| 10 US | BUTTON | 0.0360 | 0.900 | 113.0 | 0.225 | ||||||||
| 10B | BUTTON | 0.0360 | 0.910 | 110.0 | 0.231 | ||||||||
| 36 | W.INS | 0.0360 | 0.914 | 150.0 | 0.169 | 0.0275 | 0.698 | 0.0043 | 0.108 | 55º | |||
| 9 | WALTH | 0.0366 | 0.930 | 160.0 | 0.159 | 0.0280 | 0.710 | 0.0043 | 0.110 | 45º ¹ | |||
| Elgin | 0.0368 | 0.920 | 140.0 | 0.181 | 0.0280 | 0.700 | 0.0044 | 0.112 | 45º ¹ | ||||
| Elgin | 0.0368 | 0.920 | 220.0 | 0.115 | 0.0268 | 0.670 | 0.0050 | 0.127 | 45º ¹ | ||||
| 9 1/ 2 | PROG | 0.0374 | 0.950 | 112.9 | 0.225 | 0.0232 | 0.590 | 0.0071 | 0.180 | 50º | |||
| 38 | W.INS | 0.0380 | 0.965 | 120.0 | 0.212 | 0.0273 | 0.694 | 0.0053 | 0.135 | 55º | |||
| 9 Swiss | BUTTON | 0.0390 | 0.990 | 110.0 | 0.231 | ||||||||
| 1 | LOEW | 0.0394 | 1.000 | 101.6 | 0.250 | 0.0246 | 0.625 | 0.0074 | 0.188 | 53º 8' | |||
| 10 | PROG | 0.0394 | 1.000 | 101.6 | 0.250 | 0.0236 | 0.600 | 0.0079 | 0.200 | 50º | |||
| 13 | WALTH | 0.0394 | 1.000 | 180.0 | 0.141 | 0.0335 | 0.850 | 0.0030 | 0.075 | 45º ¹ | |||
| 14 | BA | 0.0394 | 1.000 | 110.4 | 0.230 | 0.0283 | 0.720 | 0.0055 | 0.140 | 47½º | |||
| 7 | WALTH | 0.0394 | 1.000 | 140.0 | 0.181 | 0.0335 | 0.850 | 0.0030 | 0.075 | 45º ¹ | |||
| M1 | Coarse | 0.0394 | 1.000 | 101.6 | 0.250 | 0.0295 | 0.750 | 0.0049 | 0.125 | 60º | |||
| 40 | W.INS | 0.0400 | 1.016 | 120.0 | 0.212 | 0.0293 | 0.745 | 0.0053 | 0.135 | 55º | |||
| Elgin | 0.0408 | 1.020 | 120L | 0.212 | 0.0300 | 0.750 | 0.0054 | 0.137 | 45º ¹ | ||||
| Elgin | 0.0408 | 1.020 | 200.0 | 0.127 | 0.0348 | 0.870 | 0.0030 | 0.076 | 45º ¹ | ||||
| 9 Elgin | BUTTON | 0.0410 | 1.030 | 120.0 | 0.212 | ||||||||
| Elgin | 0.0428 | 1.070 | 120.0 | 0.212 | 0.0328 | 0.820 | 0.0050 | 0.127 | 45º ¹ | ||||
| 8 | BUTTON | 0.0430 | 1.090 | 100.0 | 0.254 | ||||||||
| 11 | PROG | 0.0433 | 1.100 | 92.4 | 0.275 | 0.0260 | 0.660 | 0.0087 | 0.220 | 50º | |||
| 5 | WALTH | 0.0433 | 1.100 | 120.0 | 0.212 | 0.0374 | 0.950 | 0.0030 | 0.075 | 45º ¹ | |||
| M1.1 | Coarse | 0.0433 | 1.100 | 101.6 | 0.250 | 0.0335 | 0.850 | 0.0049 | 0.125 | 60º | |||
| 14 | THURY | 0.0434 | 1.102 | 110.9 | 0.229 | 47½º | |||||||
| Elgin | 0.0448 | 1.120 | 110.0 | 0.231 | 0.0340 | 0.850 | 0.0054 | 0.137 | 45º ¹ | ||||
| 45 | W.INS | 0.0450 | 1.143 | 120.0 | 0.212 | 0.0343 | 0.872 | 0.0053 | 0.135 | 55º | |||
| 13 | THURY | 0.0457 | 1.160 | 100.0 | 0.254 | 47½º | |||||||
| Elgin | 0.0468 | 1.170 | 110.0 | 0.231 | 0.0348 | 0.870 | 0.0060 | 0.152 | 45º ¹ | ||||
| 3, 6, & 7 | BUTTON | 0.0470 | 1.190 | 110.0 | 0.231 | ||||||||
| 1.2 | LOEW | 0.0472 | 1.200 | 101.6 | 0.250 | 0.0325 | 0.825 | 0.0074 | 0.188 | 53º 8' | |||
| 12 | PROG | 0.0472 | 1.200 | 84.7 | 0.300 | 0.0283 | 0.720 | 0.0094 | 0.240 | 50º | |||
| 13 | BA | 0.0472 | 1.200 | 101.6 | 0.250 | 0.0354 | 0.900 | 0.0059 | 0.150 | 47½º | |||
| 3 | WALTH | 0.0472 | 1.200 | 110.0 | 0.231 | 0.0402 | 1.020 | 0.0035 | 0.090 | 45º ¹ | |||
| 5/0 - 10/0 | CROWN | 0.0480 | 1.200 | 110.0 | 0.231 | 0.0380 | 0.950 | 0.0050 | 0.127 | ||||
| M1.2 | Coarse | 0.0480 | 1.200 | 101.6 | 0.250 | 0.0374 | 0.950 | 0.0053 | 0.135 | 60º | |||
| 36 | S&H | 0.0480 | 1.220 | 115.5 | 0.220 | 50º | |||||||
| Elgin | 0.0488 | 1.240 | 140.0 | 0.181 | 0.0400 | 1.000 | 0.0044 | 0.112 | 45º ¹ | ||||
| Elgin | 0.0488 | 1.240 | 200.0 | 0.127 | 0.0436 | 1.090 | 0.0026 | 0.066 | 45º ¹ | ||||
| 50 | W.INS | 0.0500 | 1.270 | 100.0 | 0.254 | 0.0372 | 0.945 | 0.0064 | 0.163 | 55º | |||
| Elgin | 0.0508 | 1.270 | 110L | 0.231 | 0.0388 | 0.970 | 0.0060 | 0.152 | 45º ¹ | ||||
| 4 | BUTTON | 0.0510 | 1.290 | 84.0 | 0.302 | ||||||||
| 12 | BA | 0.0510 | 1.300 | 90.9 | 0.282 | 0.0375 | 0.953 | 0.0066 | 0.168 | 47½º | |||
| 13 | PROG | 0.0512 | 1.300 | 78.2 | 0.325 | 0.0307 | 0.780 | 0.0102 | 0.260 | 50º | |||
| 12 | THURY | 0.0520 | 1.320 | 90.1 | 0.282 | 47½º | |||||||
| 11 | WALTH | 0.0528 | 1.340 | 170.0 | 0.149 | 0.0480 | 1.220 | 0.0024 | 0.060 | 45º ¹ | |||
| 5 | BUTTON | 0.0540 | 1.360 | 84.0 | 0.302 | ||||||||
| Elgin | 0.0548 | 1.370 | 180.0 | 0.141 | 0.0488 | 1.220 | 45º ¹ | ||||||
| 55 | W.INS | 0.0550 | 1.397 | 100.0 | 0.254 | 0.0422 | 1.072 | 0.0064 | 0.163 | 55º | |||
| 1.4 | LOEW | 0.0551 | 1.400 | 84.7 | 0.300 | 0.0374 | 0.950 | 0.0089 | 0.225 | 53º 8' | |||
| 14 | PROG | 0.0551 | 1.400 | 72.6 | 0.350 | 0.0331 | 0.840 | 0.0110 | 0.280 | 50º | |||
| M1.4 | Coarse | 0.0551 | 1.400 | 84.7 | 0.300 | 0.0433 | 1.100 | 0.0059 | 0.150 | 60º | |||
| 2 (pin lever) | BUTTON | 0.0580 | 1.470 | 84.0 | 0.302 | ||||||||
| 11 | THURY | 0.0587 | 1.490 | 80.9 | 0.314 | 47½º | |||||||
| 11 | BA | 0.0590 | 1.500 | 82.0 | 0.314 | 0.0445 | 1.130 | 0.0073 | 0.185 | 47½º | |||
| 1 | WALTH | 0.0591 | 1.500 | 110.0 | 0.231 | 0.0520 | 1.320 | 0.0035 | 0.090 | 45º ¹ | |||
| 15 | PROG< |