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) Size Thread Dia/ Dia/ Pitch/ Pitch/ Core Core Depth/ Depth/ Designation Name Inch mm TPI mm "Dia/""" Dia/mm Inch mm 10 W.INS 0.01 0.254 400 0.064 0.0068 0.173 0.0016 0.041 25 THURY 0.01 0.254 353.8 0.072 11 W.INS 0.011 0.279 400 0.064 0.0078 0.198 0.0016 0.041 24 THURY 0.0114 0.289 318.3 0.080 12 W.INS 0.012 0.305 350 0.073 0.0083 0.212 0.0018 0.046 23 THURY 0.0129 0.328 286.7 0.089 23 BA 0.013 0.33 282.2 0.090 0.0087 0.22 0.0022 0.055 13 W.INS 0.013 0.33 350 0.073 0.0093 0.237 0.0018 0.046 Elgin 0.0132 0.33 360 0.071 0.0112 0.28 23 WALTH 0.0138 0.35 254 0.100 0.0107 0.27 0.0016 0.04 14 W.INS 0.014 0.356 300 0.085 0.0097 0.247 0.0021 0.054 22 BA 0.0146 0.37 259.2 0.098 0.0098 0.25 0.0024 0.06 22 THURY 0.0146 0.372 257.9 0.099 Elgin 0.0148 0.37 320 0.079 0.012 0.28 0.0014 0.03556 15 WINS 0.015 0.381 300 0.085 0.0107 0.273 0.0021 0.054 4 PROG 0.0157 0.4 254 0.100 0.0094 0.24 0.0031 0.08 16 W.INS 0.016 0.406 300 0.085 0.0117 0.298 0.0021 0.054 21 BA 0.0165 0.42 230.9 0.110 0.0114 0.29 0.0026 0.065 21 THURY 0.0168 0.426 233 0.109 Elgin 0.0168 0.42 260 0.098 0.0132 0.33 0.0018 0.04572 17 W.INS 0.017 0.432 250 0.102 0.0119 0.302 0.0026 0.065 21 WALTH 0.0177 0.45 240 0.106 0.0134 0.34 0.0022 0.055 4 1/2 PROG 0.0177 0.45 254 0.100 0.0114 0.29 0.0031 0.08 18 W.INS 0.018 0.457 250 0.102 0.0129 0.327 0.0026 0.065 20 THURY 0.0189 0.479 208.2 0.122 20 BA 0.0189 0.48 211.7 0.120 0.0134 0.34 0.0028 0.07 19 W.INS 0.019 0.483 250 0.102 0.0139 0.353 0.0026 0.065 5 PROG 0.0197 0.5 203.2 0.125 0.0118 0.3 0.0039 0.1 20 W.INS 0.02 0.508 210 0.121 0.0139 0.353 0.003 0.077 Elgin 0.0208 0.52 220 0.115 0.0168 0.42 0.0020 0.0508 19 BA 0.0213 0.54 181.4 0.140 0.0146 0.37 0.0033 0.085 19 THURY 0.0214 0.543 188.1 0.135 19 WALTH 0.0217 0.55 220 0.115 0.0177 0.45 0.002 0.05 5 1/2 PROG 0.0217 0.55 203.2 0.125 0.0138 0.35 0.0039 0.1 22 W.INS 0.022 0.559 210 0.121 0.0159 0.404 0.003 0.077 Elgin 0.0228 0.57 260 0.098 0.0188 0.47 0.0020 0.0508 6 PROG 0.0236 0.6 169.3 0.150 0.0142 0.36 0.0047 0.12 24 W.INS 0.024 0.61 210 0.121 0.0179 0.455 0.003 0.077 18 THURY 0.0243 0.616 169.3 0.150 18 BA 0.0244 0.62 169.3 0.150 0.0173 0.44 0.0035 0.09 Elgin 0.0248 0.62 220 0.115 0.02 0.5 0.0024 0.06096 17 WALTH 0.0256 0.65 200 0.127 0.0213 0.54 0.0022 0.055 6 1/2 PROG 0.0256 0.65 169.3 0.150 0.0161 0.41 0.0047 0.12 26 W.INS 0.026 0.66 180 0.141 0.0189 0.48 0.0036 0.09 Elgin 0.0268 0.67 180 0.141 0.022 0.55 0.0024 0.06096 17 THURY 0.0275 0.699 152.1 0.167 17 BA 0.0276 0.7 149.4 0.170 0.0197 0.5 0.0039 0.1 7 PROG 0.0276 0.7 145.1 0.175 0.0165 0.42 0.0055 0.14 28 W.INS 0.028 0.711 180 0.141 0.0209 0.531 0.0036 0.09 Elgin 0.0288 0.72 220 0.115 0.0248 0.62 0.0020 0.0508 7 1/2 PROG 0.0295 0.75 145.1 0.175 0.0185 0.47 0.0055 0.14 30 W.INS 0.03 0.762 180 0.141 0.0229 0.581 0.0036 0.09 12 Swiss BUTTON 0.03 0.76 140 0.181 Elgin 0.0308 0.77 180 0.141 0.0248 0.62 0.0030 0.0762 Elgin 0.0308 0.77 220 0.115 0.0268 0.67 0.0020 0.0508 16 BA 0.0311 0.79 133.7 0.190 0.022 0.56 0.0045 0.115 16 THURY 0.0313 0.794 137.3 0.185 8 PROG 0.0315 0.8 127 0.200 0.0189 0.48 0.0063 0.16 32 W.INS 0.032 0.813 180 0.141 0.0249 0.632 0.0036 0.09 15 WALTH 0.0327 0.83 180 0.141 0.028 0.71 0.0024 0.06 11 Swiss BUTTON 0.033 0.84 140 0.181 8 1/2 PROG 0.0335 0.85 127 0.200 0.0209 0.53 0.0063 0.16 34 W.INS 0.034 0.864 150 0.169 0.0255 0.647 0.0043 0.108 10A Swiss BUTTON 0.034 0.86 110 0.231 10 Swiss BUTTON 0.035 0.89 110 0.231 15 BA 0.0354 0.9 121 0.210 0.0256 0.65 0.0049 0.125 9 PROG 0.0354 0.9 112.9 0.225 0.0213 0.54 0.0071 0.18 15 THURY 0.0355 0.901 123.3 0.206 10 US BUTTON 0.036 0.9 113 0.225 10B BUTTON 0.036 0.91 110 0.231 36 W.INS 0.036 0.914 150 0.169 0.0275 0.698 0.0043 0.108 9 WALTH 0.0366 0.93 160 0.159 0.028 0.71 0.0043 0.11 Elgin 0.0368 0.92 140 0.181 0.028 0.7 0.0044 0.11176 Elgin 0.0368 0.92 220 0.115 0.0268 0.67 0.0050 0.127 9 1/2 PROG 0.0374 0.95 112.9 0.225 0.0232 0.59 0.0071 0.18 38 W.INS 0.038 0.965 120 0.212 0.0273 0.694 0.0053 0.135 9 Swiss BUTTON 0.039 0.99 110 0.231 1 LOEW 0.0394 1 101.6 0.250 0.0246 0.625 0.0074 0.188 10 PROG 0.0394 1 101.6 0.250 0.0236 0.6 0.0079 0.2 13 WALTH 0.0394 1 180 0.141 0.0335 0.85 0.003 0.075 14 BA 0.0394 1 110.4 0.230 0.0283 0.72 0.0055 0.14 7 WALTH 0.0394 1 140 0.181 0.0335 0.85 0.003 0.075 M1 Coarse 0.0394 1 101.6 0.250 0.0295 0.75 0.0049 0.12538 40 W.INS 0.04 1.016 120 0.212 0.0293 0.745 0.0053 0.135 Elgin 0.0408 1.02 120L 0.212 0.03 0.75 0.0054 0.13716 Elgin 0.0408 1.02 200 0.127 0.0348 0.87 0.0030 0.0762 9 Elgin BUTTON 0.041 1.03 120 0.212 Elgin 0.0428 1.07 120 0.212 0.0328 0.82 0.0050 0.127 8 BUTTON 0.043 1.09 100 0.254 11 PROG 0.0433 1.1 92.4 0.275 0.026 0.66 0.0087 0.22 5 WALTH 0.0433 1.1 120 0.212 0.0374 0.95 0.003 0.075 M1.1 Coarse 0.0433 1.1 101.6 0.250 0.0335 0.85 0.0049 0.12491 14 THURY 0.0434 1.102 110.9 0.229 Elgin 0.0448 1.12 110 0.231 0.034 0.85 0.0054 0.13716 45 W.INS 0.045 1.143 120 0.212 0.0343 0.872 0.0053 0.135 13 THURY 0.0457 1.16 100 0.254 Elgin 0.0468 1.17 110 0.231 0.0348 0.87 0.0060 0.1524 "3, 6, & 7" BUTTON 0.047 1.19 110 0.231 1.2 LOEW 0.0472 1.2 101.6 0.250 0.0325 0.825 0.0074 0.188 12 PROG 0.0472 1.2 84.7 0.300 0.0283 0.72 0.0094 0.24 13 BA 0.0472 1.2 101.6 0.250 0.0354 0.9 0.0059 0.15 3 WALTH 0.0472 1.2 110 0.231 0.0402 1.02 0.0035 0.09 5/0 - 10/0 CROWN 0.048 1.2 110 0.231 0.038 0.95 0.0050 0.127 M1.2 Coarse 0.048 1.2 101.6 0.250 0.0374 0.95 0.0053 0.1346 Elgin 0.0488 1.22 140 0.181 0.04 1 0.0044 0.11176 Elgin 0.0488 1.22 200 0.127 0.0436 1.09 0.0026 0.06604 50 W.INS 0.05 1.27 100 0.254 0.0372 0.945 0.0064 0.163 Elgin 0.0508 1.27 110L 0.231 0.0388 0.97 0.0060 0.1524 4 BUTTON 0.051 1.29 84 0.302 12 BA 0.051 1.3 90.9 0.282 0.0375 0.953 0.0066 0.168 13 PROG 0.0512 1.3 78.2 0.325 0.0307 0.78 0.0102 0.26 12 THURY 0.052 1.32 90.1 0.282 11 WALTH 0.0528 1.34 170 0.149 0.048 1.22 0.0024 0.06 5 BUTTON 0.054 1.36 84 0.302 Elgin 0.0548 1.37 180 0.141 0.0488 1.22 55 W.INS 0.055 1.397 100 0.254 0.0422 1.072 0.0064 0.163 1.4 LOEW 0.0551 1.4 84.7 0.300 0.0374 0.95 0.0089 0.225 14 PROG 0.0551 1.4 72.6 0.350 0.0331 0.84 0.011 0.28 M1.4 Coarse 0.0551 1.4 84.7 0.300 0.0433 1.1 0.0059 0.14977 2 (pin lever) BUTTON 0.058 1.47 84 0.302 11 THURY 0.0587 1.49 80.9 0.314 11BA 0.059 1.5 82 0.314 0.0445 1.13 0.0073 0.185 1 WALTH 0.0591 1.5 110 0.231 0.052 1.32 0.0035 0.09 15 PROG 0.0591 1.5 67.7 0.375 0.0354 0.9 0.0118 0.3 0-80 ASME 0.06 1.524 80 0.318 0.0438 1.113 0.0081 0.206 2 (pocket) BUTTON 0.06 1.55 80 0.318 60 W.INS 0.06 1.524 100 0.254 0.0472 1.199 0.0064 0.163 Elgin 0.0608 1.52 110 0.231 0.0488 1.22 0.0060 0.1524 Elgin 0.0608 1.52 110L 0.231 0.0488 1.22 0.0060 0.1524 12 - 6 - 0 CROWN 0.061 1.53 80 0.318 0.048 1.2 0.0065 0.1651 16 PROG 0.063 1.6 55.6 0.457 0.0342 0.869 0.0144 0.366 M1.6 Coarse 0.063 1.6 72.6 0.350 0.0492 1.25 0.0069 0.1751 10 THURY 0.0646 1.64 72.8 0.349 65 W.INS 0.065 1.651 80 0.318 0.049 1.245 0.008 0.203 1.7 LOEW 0.0669 1.7 72.6 0.350 0.0463 1.175 0.0103 0.263 17 PROG 0.0669 1.7 52.3 0.486 0.0363 0.922 0.0153 0.389 10 BA 0.067 1.7 72.5 0.349 0.0503 1.278 0.0083 0.211 70 W.INS 0.07 1.778 80 0.318 0.054 1.372 0.008 0.203 Elgin 0.0708 1.77 180L 0.141 0.0648 1.62 0.0030 0.0762 18 PROG 0.0709 1.8 49.4 0.514 0.0385 0.978 0.0162 0.411 M1.8 Coarse 0.0709 1.8 72.6 0.350 0.0571 1.45 0.0069 0.17543 1 - 56 ASME 0.073 1.854 56 0.454 0.0498 1.265 0.0116 0.295 1 - 64 ASME 0.073 1.854 64 0.397 0.0527 1.339 0.0102 0.258 1 - 72 ASME 0.073 1.854 72 0.353 0.055 1.397 0.009 0.229 1 BUTTON 0.074 1.88 72 0.353 19 PROG 0.0748 1.9 46.8 0.543 0.0406 1.031 0.0171 0.434 75 W.INS 0.075 1.905 80 0.318 0.059 1.499 0.008 0.203 9 BA 0.075 1.9 64.9 0.387 0.0564 1.433 0.0092 0.234 9 THURY 0.0756 1.92 65.6 0.387 Elgin 0.0768 1.92 110L 0.231 0.0708 1.77 0.0030 0.0762 16 CROWN 0.077 1.93 72 0.353 0.063 1.58 0.0070 0.1778 Elgin 0.0772 1.93 80L 0.318 0.0612 1.53 0.0080 0.2032 2 LOEW 0.0787 2 63.5 0.400 0.0551 1.4 0.0118 0.3 20 PROG 0.0787 2 44.5 0.571 0.0428 1.086 0.018 0.457 M2 Coarse 0.0787 2 63.5 0.400 0.0630 1.6 0.0079 0.19949 80 W.INS 0.08 2.032 60 0.423 0.0587 1.49 0.0107 0.271 85 W.INS 0.085 2.159 60 0.423 0.0637 1.617 0.0107 0.271 8 THURY 0.0858 2.18 59.1 0.430 2 - 56 ASME 0.086 2.184 56 0.454 0.0628 1.595 0.0116 0.295 2 - 64 ASME 0.086 2.184 64 0.397 0.0657 1.669 0.0101 0.258 8 BA 0.087 2.2 59.2 0.430 0.0664 1.687 0.01 0.257 M2.2 Coarse 0.087 2.2 56.4 0.450 0.0689 1.75 0.0091 0.2299 0 BUTTON 0.89 2.26 60 0.423 Elgin 0.0892 2.23 80L 0.318 0.0712 1.78 0.0090 0.2286 90 W.INS 0.09 2.286 60 0.423 0.0687 1.744 0.0107 0.271 95 W.INS 0.09 2.286 50 0.508 0.0644 1.636 0.0128 0.325 2.3 LOEW 0.0906 2.3 63.5 0.400 0.0669 1.7 0.0118 0.3 18.0 CROWN 0.091 2.28 60 0.423 0.071 1.78 0.0100 0.254 7 THURY 0.0976 2.48 53.1 0.478 7 BA 0.098 2.5 52.9 0.478 0.0758 1.925 0.011 0.287 M2.5 Coarse 0.098 2.5 56.4 0.450 0.0807 2.05 0.0086 0.2196 3 - 48 ASME 0.099 2.515 48 0.529 0.0719 1.827 0.0135 0.344 3 - 56 ASME 0.099 2.515 56 0.454 0.0758 1.925 0.0116 0.295 100 W.INS 0.1 2.54 50 0.508 0.0744 1.89 0.0128 0.325 U HOLTZ 0.1 2.54 55 0.462 10/0 PEND 0.1016 2.58 90 0.282 0.0846 2.15 0.0085 0.215 2.6 LOEW 0.1024 2.6 56.4 0.450 0.0758 1.925 0.0133 0.338 6 BA 0.11 2.8 47.9 0.531 0.085 2.164 0.013 0.318 6 THURY 0.1106 2.81 47.8 0.531 4 - 32 ASME 0.112 2.845 32 0.794 0.0714 1.814 0.0203 0.516 4 - 36 ASME 0.112 2.845 36 0.706 0.0759 1.928 0.018 0.458 4 - 40 ASME 0.112 2.845 40 0.635 0.0795 2.02 0.0162 0.412 4 - 40 UNC 0.112 2.845 40 0.635 0.081 2.065 0.015 0.39 4 - 48 ASME 0.112 2.845 48 0.529 0.0849 2.157 0.0135 0.344 M3 Coarse 0.118 3 50.8 0.500 0.094 2.387 0.012 0.307 3 LOEW 0.1181 3 50.8 0.500 0.0886 2.25 0.0148 0.375 T HOLTZ 0.12 3.048 55 0.462 1/8 BRASS 0.125 3.175 26 0.977 0.0758 1.925 0.0246 0.625 1/8 CEI 0.125 3.175 40 0.635 0.0984 2.499 0.0133 0.338 1/8 WHIT 0.125 3.175 40 0.635 0.093 2.362 0.016 0.406 5 - 36 ASME 0.125 3.175 36 0.706 0.0889 2.258 0.018 0.458 5 - 40 ASME 0.125 3.175 40 0.635 0.0925 2.35 0.0162 0.412 5 - 44 ASME 0.125 3.175 44 0.577 0.0955 2.425 0.0148 0.375 5 THURY 0.1256 3.19 43.1 0.590 5/0 PEND 0.126 3.2 80 0.318 0.1122 2.85 0.0069 0.175 5 BA 0.126 3.2 43.1 0.590 0.098 2.489 0.014 0.353 3.5 LOEW 0.1378 3.5 42.3 0.600 0.1024 2.6 0.0177 0.45 6 - 32 ASME 0.138 3.505 32 0.794 0.0974 2.474 0.0203 0.516 6 - 32 UNC 0.138 3.5 32 0.794 0.1 2.532 0.019 0.487 6 - 36 ASME 0.138 3.505 36 0.706 0.1019 2.589 0.018 0.458 6 - 40 ASME 0.138 3.505 40 0.635 0.1055 2.68 0.0162 0.412 M3.5 Coarse 0.138 3.5 42.3 0.600 0.109 2.764 0.014 0.368 4 BA 0.142 3.6 38.5 0.656 0.111 2.807 0.016 0.396 4 THURY 0.1425 3.62 38.7 0.656 0.148 GAS 0.148 3.759 32 0.794 R HOLTZ 0.15 3.81 55 0.462 7 - 30 ASME 0.151 3.835 30 0.847 0.1077 2.736 0.0217 0.55 7 - 32 ASME 0.151 3.835 32 0.794 0.1104 2.804 0.0203 0.516 7 - 36 ASME 0.151 3.835 36 0.706 0.1149 2.919 0.018 0.458 0 PEND 0.1535 3.9 66 0.385 0.1358 3.45 0.0089 0.225 5/32 CEI 0.1563 3.97 32 0.794 0.1231 3.127 0.0166 0.422 M4 Coarse 0.157 4 36.3 0.700 0.124 3.141 0.019 0.492 4 LOEW 0.1575 4 36.3 0.700 0.1161 2.95 0.0207 0.525 3 BA 0.161 4.1 34.8 0.729 0.127 3.226 0.017 0.437 3 THURY 0.1618 4.11 34.8 0.729 Q HOLTZ 0.162 4.115 39.9 0.637 8 - 30 ASME 0.164 4.166 30 0.847 0.1207 3.066 0.0217 0.55 8 - 32 ASME 0.164 4.166 32 0.794 0.1234 3.134 0.0203 0.516 8 - 32 UNC 0.164 4.166 32 0.794 0.126 3.2 0.019 0.487 8 - 36 ASME 0.164 4.166 36 0.706 0.1279 3.249 0.018 0.458 8 - 40 ASME 0.164 4.166 40 0.635 0.1315 3.341 0.0162 0.412 12 - 6 PEND 0.1732 4.4 66 0.385 0.1555 3.95 0.0089 0.225 9 - 24 ASME 0.177 4.496 24 1.058 0.1229 3.121 0.0271 0.687 9 - 30 ASME 0.177 4.496 30 0.847 0.1337 3.396 0.0217 0.55 9 - 32 ASME 0.177 4.496 32 0.794 0.1364 3.465 0.0203 0.516 M4.5 Coarse 0.177 4.5 33.9 0.750 0.141 3.58 0.018 0.46 4.5 LOEW 0.1772 4.5 33.9 0.750 0.1329 3.375 0.0221 0.563 0 HOLTZ 0.18 4.572 36.1 0.704 2 THURY 0.1835 4.66 31.4 0.810 2 BA 0.185 4.7 31.4 0.810 0.147 3.729 0.019 0.485 S HOLTZ 0.185 4.699 55 0.462 3/16 CEI 0.1875 4.763 32 0.794 0.1543 3.919 0.0166 0.422 3/16 BSF 0.188 4.763 32 0.794 0.148 3.747 0.02 0.508 3/16 WHIT 0.188 4.763 24 1.058 0.134 3.406 0.027 0.678 10 - 24 ASME 0.19 4.826 24 1.058 0.1359 3.451 0.0271 0.687 10 - 24 UNC 0.19 4.826 24 1.058 0.139 3.528 0.026 0.649 10 - 28 ASME 0.19 4.826 28 0.907 0.1436 3.648 0.0232 0.589 10 - 30 ASME 0.19 4.826 30 0.847 0.1467 3.726 0.0217 0.55 10 - 32 ASME 0.19 4.826 32 0.794 0.1494 3.795 0.0203 0.516 10 - 32 UNF 0.19 4.826 32 0.794 0.152 3.853 0.019 0.487 P HOLTZ 0.19 4.826 39.9 0.637 0.196 GAS 0.196 4.978 32 0.794 16 PEND 0.1969 5 60 0.423 0.1772 4.5 0.0098 0.25 5 LOEW 0.1969 5 31.8 0.800 0.1496 3.8 0.0236 0.6 M5 Coarse 0.197 5 31.8 0.800 0.158 4.018 0.019 0.491 N HOLTZ 0.2 5.08 36.1 0.704 1 THURY 0.2083 5.29 28.2 0.900 1 BA 0.209 5.3 28.3 0.900 0.166 4.224 0.021 0.538 L HOLTZ 0.21 5.334 28.9 0.879 12 - 24 ASME 0.216 5.486 24 1.058 0.1619 4.112 0.0271 0.687 12 - 28 ASME 0.216 5.486 28 0.907 0.1696 4.308 0.0232 0.589 12 - 32 ASME 0.216 5.486 32 0.794 0.1754 4.455 0.0203 0.516 5.5 LOEW 0.2165 5.5 28.2 0.900 0.1634 4.15 0.0266 0.675 7/32 CEI 0.2188 5.558 26 0.977 0.1778 4.516 0.0205 0.521 7/32 BSF 0.219 5.558 28 0.907 0.173 4.394 0.023 0.582 18 PEND 0.2323 5.9 50 0.508 0.2079 5.28 0.0122 0.31 0 BA 0.236 6 25.4 1.000 0.189 4.8 0.024 0.6 M6 Coarse 0.236 6 25.4 1.000 0.188 4.773 0.024 0.613 0 THURY 0.2362 6 25.4 1.000 6 LOEW 0.2362 6 25.4 1.000 0.1772 4.5 0.0295 0.75 M HOLTZ 0.24 6.096 36.1 0.704 14 - 20 ASME 0.242 6.147 20 1.270 0.177 4.497 0.0325 0.825 14 - 24 ASME 0.242 6.147 24 1.058 0.1879 4.772 0.0271 0.687 No.4 GAS 0.246 6.248 27 0.941 1/4 BRASS 0.25 6.35 26 0.977 0.2008 5.1 0.0246 0.625 1/4 BSF 0.25 6.35 26 0.977 0.201 5.1 0.025 0.625 1/4 CEI 0.25 6.35 26 0.977 0.209 5.309 0.0205 0.521 1/4 UNC 0.25 6.35 20 1.270 0.189 4.793 0.031 0.779 1/4 UNF 0.25 6.35 28 0.907 0.206 5.237 0.022 0.557 1/4 WHIT 0.25 6.35 20 1.270 0.186 4.724 0.032 0.813 1/4 SPARK 0.25 6.35 24 1.058 0.1959 4.975 0.0271 0.687 K HOLTZ 0.25 6.35 25.7 0.990 1/4 GAS 0.26 6.604 27 0.941 16-18 ASME 0.268 6.807 18 1.411 0.1958 4.974 0.0361 0.917 16-20 ASME 0.268 6.807 20 1.270 0.203 5.157 0.0325 0.825 16-22 ASME 0.268 6.807 22 1.155 0.209 5.307 0.0295 0.75 -1 THURY 0.2681 6.81 23.1 1.100 7 LOEW 0.2756 7 23.1 1.100 0.2106 5.35 0.0325 0.825 M7 Coarse 0.276 7 25.4 1.000 0.227 5.773 0.024 0.613 9/32 CEI 0.2813 7.145 26 0.977 0.2403 6.104 0.0205 0.521 J HOLTZ 0.29 7.366 25.7 0.990 18-18 ASME 0.294 7.468 18 1.411 0.2218 5.635 0.0361 0.917 18-20 ASME 0.294 7.468 20 1.270 0.229 5.818 0.0325 0.825 -2 THURY 0.3043 7.73 20.7 1.230 5/16 CEI 0.3125 7.938 26 0.977 0.2715 6.896 0.0205 0.521 5/16 BSF 0.313 7.938 22 1.155 0.254 6.459 0.029 0.739 5/16 UNC 0.313 7.938 18 1.411 0.244 6.205 0.034 0.866 5/16 UNF 0.313 7.938 24 1.058 0.261 6.64 0.026 0.649 5/16 WHIT 0.313 7.938 18 1.411 0.241 6.132 0.036 0.904 8 LOEW 0.315 8 21.2 1.200 0.2441 6.2 0.0354 0.9 M8 Coarse 0.315 8 20.3 1.250 0.255 6.466 0.03 0.767 M8 Fine 0.315 8 25.4 1.000 0.267 6.773 0.024 0.613 20-16 ASME 0.32 8.128 16 1.588 0.2388 6.066 0.0406 1.031 20-18 ASME 0.32 8.128 18 1.411 0.2478 6.295 0.0361 0.917 20-20 ASME 0.32 8.128 20 1.270 0.255 6.478 0.0325 0.825 I HOLTZ 0.33 8.382 25.7 0.990 5/16 GAS 0.342 8.687 27 0.941 -3 THURY 0.3453 8.77 18.5 1.370 22-16 ASME 0.346 8.788 16 1.588 0.2648 6.726 0.0406 1.031 22-18 ASME 0.346 8.788 18 1.411 0.2738 6.955 0.0361 0.917 9 LOEW 0.3543 9 19.5 1.300 0.2776 7.05 0.0384 0.975 H HOLTZ 0.36 9.144 19.9 1.277 24-16 ASME 0.372 9.449 16 1.588 0.2908 7.387 0.0406 1.031 24-18 ASME 0.372 9.449 18 1.411 0.2998 7.616 0.0361 0.917 3/8 ADM 0.375 9.525 24 1.058 0.3216 8.17 0.0267 0.678 3/8 BRASS 0.375 9.525 26 0.977 0.3258 8.275 0.0246 0.625 3/8 BSF 0.375 9.525 20 1.270 0.311 7.899 0.032 0.813 3/8 CEI 0.375 9.525 26 0.977 0.334 8.484 0.0205 0.521 3/8 UNC 0.375 9.525 16 1.588 0.298 7.577 0.038 0.974 3/8 UNF 0.375 9.525 24 1.058 0.324 8.227 0.026 0.649 3/8 WHIT 0.375 9.525 16 1.588 0.295 7.493 0.04 1.016 3/8 SPARK 0.375 9.525 24 1.058 0.3209 8.15 0.0271 0.687 3/8 BSP 0.383 9.728 28 0.907 0.337 8.56 0.023 0.582 3/8 GAS 0.39 9.906 27 0.941 -4 THURY 0.3917 9.95 16.7 1.520 10 LOEW 0.3937 10 18.1 1.400 0.311 7.9 0.0413 1.05 M10 Coarse 0.394 10 16.9 1.500 0.321 8.16 0.036 0.92 M10 Fine 0.394 10 20.3 1.250 0.333 8.467 0.03 0.767 26-14 ASME 0.398 10.109 14 1.814 0.3052 7.752 0.0464 1.178 26-16 ASME 0.398 10.109 16 1.588 0.3168 8.047 0.0406 1.031 1/8 WPIPE 0.4063 10.319 28 0.907 0.3603 9.15 0.023 0.584 G HOLTZ 0.41 10.414 19.9 1.277 28-14 ASME 0.424 10.77 14 1.814 0.3312 8.413 0.0464 1.178 28-16 ASME 0.424 10.77 16 1.588 0.3428 8.707 0.0406 1.031 7/16 ADM 0.4375 11.113 24 1.058 0.3841 9.757 0.0267 0.678 7/16 BSF 0.4375 11.113 18 1.411 0.3663 9.304 0.0356 0.904 7/16 CEI 0.4375 11.113 26 0.977 0.3965 10.071 0.0205 0.521 7/16 CEI20 0.4375 11.113 20 1.270 0.3843 9.761 0.0266 0.676 7/16 UNC 0.4375 11.113 14 1.814 0.3499 8.887 0.0438 1.113 7/16 UNF 0.4375 11.113 20 1.270 0.3762 9.555 0.3067 7.79 7/16 WHIT 0.4375 11.113 14 1.814 0.346 8.788 0.0457 1.161 -5 THURY 0.4449 11.3 15 1.690 30-14 ASME 0.45 11.43 14 1.814 0.3572 9.073 0.0464 1.178 30-16 ASME 0.45 11.43 16 1.588 0.3688 9.368 0.0406 1.031 F HOLTZ 0.45 11.43 16.5 1.539 7/16 GAS 0.459 11.659 27 0.941 M12 Coarse 0.4724 12 14.5 1.750 0.3879 9.853 0.0423 1.074 M12 Fine 0.4724 12 20.3 1.250 0.4121 10.467 0.0302 0.767 12 LOEW 0.4724 12 15.9 1.600 0.378 9.6 0.0472 1.2 12MM SPARK 0.4724 12 25.4 1.000 0.4252 10.8 0.0236 0.6 Pg7 COND 0.492 12.5 20 1.270 0.444 11.28 0.0240 0.61 1/2 ADM 0.5 12.7 20 1.270 0.436 11.074 0.032 0.813 1/2 BRASS 0.5 12.7 26 0.977 0.4508 11.45 0.0246 0.625 1/2 BSF 0.5 12.7 16 1.588 0.42 10.668 0.04 1.016 1/2 CEI 0.5 12.7 26 0.977 0.459 11.659 0.0205 0.521 1/2 CEI20 0.5 12.7 20 1.270 0.4468 11.349 0.0266 0.676 1/2 UNC 0.5 12.7 13 1.954 0.4056 10.302 0.0438 1.113 1/2 UNF 0.5 12.7 20 1.270 0.4387 11.143 0.05 1.27 1/2 WHIT 0.5 12.7 12 2.117 0.3933 9.99 0.0534 1.356 E HOLTZ 0.5 12.7 13.1 1.940 -6 THURY 0.5039 12.8 13.5 1.880 1/2 GAS 0.515 13.081 27 0.941 1/4 BSP 0.518 13.157 19 1.337 0.451 11.455 0.0335 0.851 1/4 WPIPE 0.5313 13.494 19 1.337 0.4643 11.792 0.0335 0.851 M15 Coarse 0.5512 14 12.7 2.000 0.4546 11.546 0.0483 1.227 14 LOEW 0.5512 14 14.1 1.800 0.4449 11.3 0.0531 1.35 14MM SPARK 0.5512 14 20.3 1.250 0.4908 12.466 0.0302 0.767 9/16 ADM 0.5556 14.111 20 1.270 0.4915 12.485 0.032 0.813 D HOLTZ 0.56 14.224 13.1 1.940 9/16 BSF 0.5625 14.288 16 1.588 0.4825 12.256 0.04 1.016 9/16 CEI 0.5625 14.288 26 0.977 0.5215 13.246 0.0205 0.521 9/16 CEI20 0.5625 14.288 20 1.270 0.5093 12.936 0.0266 0.676 9/16 UNC 0.5625 14.288 12 2.117 0.4603 11.692 0.0511 1.298 9/16 UNF 0.5625 14.288 18 1.411 0.4943 12.555 0.0341 0.866 9/16 WHIT 0.5625 14.288 12 2.117 0.4558 11.577 0.0534 1.356 -7 THURY 0.5709 14.5 12.2 2.090 9/16 GAS 0.578 14.681 27 0.941 Pg9 COND 0.598 15.2 18 1.411 0.546 13.86 0.0264 0.67 5/8 ADM 0.625 15.875 20 1.270 0.561 14.249 0.032 0.813 5/8 BRASS 0.625 15.875 26 0.977 0.5758 14.625 0.0246 0.625 5/8 BSF 0.625 15.875 14 1.814 0.5336 13.553 0.0457 1.161 5/8 CEI 0.625 15.875 26 0.977 0.584 14.834 0.0205 0.521 5/8 CEI20 0.625 15.875 20 1.270 0.5718 14.524 0.0266 0.676 5/8 UNC 0.625 15.875 11 2.309 0.5135 13.043 0.0558 1.417 5/8 UNF 0.625 15.875 18 1.411 0.5568 14.143 0.0341 0.866 5/8 WHIT 0.625 15.875 11 2.309 0.5086 12.918 0.0582 1.478 DD HOLTZ 0.625 15.875 13.1 1.940 M16 Coarse 0.6299 16 12.7 2.000 0.5333 13.546 0.0483 1.227 M16 Fine 0.6299 16 16.9 1.500 0.5575 14.16 0.0362 0.92 16 LOEW 0.6299 16 12.7 2.000 0.5118 13 0.0591 1.5 5/8 GAS 0.637 16.18 27 0.941 -8 THURY 0.6496 16.5 10.9 2.320 3/8 BSP 0.656 16.662 19 1.337 0.589 14.961 0.0335 0.851 11/16 ADM 0.6875 17.463 20 1.270 0.6235 15.836 0.032 0.813 11/16 CEI 0.6875 17.463 26 0.977 0.6465 16.421 0.0205 0.521 11/16 CEI20 0.6875 17.463 20 1.270 0.6343 16.111 0.0266 0.676 3/8 WPIPE 0.6875 17.463 19 1.337 0.6205 15.761 0.0335 0.851 M18 Coarse 0.7087 18 10.2 2.500 0.5879 14.933 0.0604 1.534 18 LOEW 0.7087 18 11.5 2.200 0.5787 14.7 0.065 1.65 18MM SPARK 0.7087 18 16.9 1.500 0.6362 16.16 0.0362 0.92 Pg11 COND 0.732 18.6 18 1.411 0.680 17.26 0.0264 0.67 -9 THURY 0.7362 18.7 9.8 2.580 3/4 ADM 0.75 19.05 14 1.814 0.6585 16.727 0.0457 1.162 3/4 BRASS 0.75 19.05 26 0.977 0.7008 17.8 0.0246 0.625 3/4 BSF 0.75 19.05 12 2.117 0.6432 16.337 0.0534 1.356 3/4 CEI 0.75 19.05 26 0.977 0.709 18.009 0.0205 0.521 3/4 CEI20 0.75 19.05 20 1.270 0.6968 17.699 0.0266 0.676 3/4 UNC 0.75 19.05 10 2.540 0.6273 15.933 0.0613 1.558 3/4 UNF 0.75 19.05 16 1.588 0.6733 17.102 0.0625 1.588 3/4 WHIT 0.75 19.05 10 2.540 0.6219 15.796 0.064 1.626 C HOLTZ 0.75 19.05 9.5 2.688 3/4 GAS 0.77 19.558 27 0.941 M20 Coarse 0.7874 20 10.2 2.500 0.6666 16.933 0.0604 1.534 M20 Fine 0.7874 20 16.9 1.500 0.715 18.16 0.0362 0.92 Pg13.5 COND 0.803 20.4 18 1.411 0.750 19.06 0.0264 0.67 13/16 ADM 0.8125 20.638 14 1.814 0.721 18.314 0.0457 1.162 1/2 BSP 0.825 20.955 14 1.814 0.734 18.644 0.0457 1.161 -10 THURY 0.8346 21.2 8.9 2.870 1/2 WPIPE 0.8438 21.431 14 1.814 0.7548 19.171 0.0445 1.13 M22 Coarse 0.8661 22 10.2 2.500 0.7454 18.933 0.0604 1.534 7/8 ADM 0.875 22.225 14 1.814 0.7835 19.902 0.0457 1.162 7/8 BRASS 0.875 22.225 26 0.977 0.8258 20.975 0.0246 0.625 7/8 BSF 0.875 22.225 11 2.309 0.7586 19.268 0.0582 1.478 7/8 UNC 0.875 22.225 9 2.822 0.7387 18.763 0.0682 1.731 7/8 UNF 0.875 22.225 14 1.814 0.7874 20 0.0438 1.113 7/8 WHIT 0.875 22.225 9 2.822 0.7327 18.611 0.0711 1.806 7/8 SPARK 0.875 22.225 18 1.411 0.8028 20.392 0.0361 0.917 B HOLTZ 0.875 22.225 8.3 3.079 7/8 GAS 0.885 22.479 27 0.941 Pg16 COND 0.886 22.5 18 1.411 0.833 21.16 0.0264 0.67 5/8 BSP 0.902 22.911 14 1.814 0.811 20.599 0.0457 1.161 15/16 ADM 0.9375 23.813 14 1.814 0.846 21.489 0.0457 1.162 5/8 WPIPE 0.9375 23.813 14 1.814 0.8485 21.552 0.0445 1.13 M24 Coarse 0.9449 24 8.5 3.000 0.8 20.319 0.0725 1.84 M24 Fine 0.9449 24 12.7 2.000 0.8483 21.546 0.0483 1.226 -11 THURY 0.9492 24.11 8 3.190 1 ADM 1 25.4 12 2.117 0.8933 22.689 0.0534 1.355 1 BRASS 1 25.4 26 0.977 0.9508 24.15 0.0246 0.625 1 BSF 1 25.4 10 2.540 0.872 22.149 0.064 1.626 1 UNC 1 25.4 8 3.175 0.8466 21.504 0.0767 1.948 1 UNF 1 25.4 12 2.117 0.8978 22.804 0.0511 1.298 1 WHIT 1 25.4 8 3.175 0.8399 21.333 0.08 2.032 A HOLTZ 1 25.4 6.6 3.860 1 GAS 1.006 25.552 27 0.941 1 1/8 BRASS 1.04 26.416 26 0.977 0.9908 25.166 0.0246 0.625 3/4 BSP 1.041 26.441 14 1.814 0.95 24.13 0.0457 1.161 1 1/16 ADM 1.0625 26.988 12 2.117 0.9558 24.277 0.0534 1.355 3/4 WPIPE 1.0625 26.988 14 1.814 0.9735 24.727 0.0445 1.13 M27 Coarse 1.063 27 8.5 3.000 0.9181 23.319 0.0725 1.84 -12 THURY 1.0787 27.4 7.2 3.540 Pg21 COND 1.114 28.3 16 1.588 1.054 26.78 0.0299 0.76 1 1/8 1.125 28.575 7 3.629 0.942 23.927 0.0915 2.324 1 1/8 ADM 1.125 28.575 12 2.117 1.0183 25.864 0.0534 1.355 1 1/8 BSF 1.125 28.575 9 2.822 0.9828 24.963 0.0711 1.806 1 1/8 UNC 1.125 28.575 7 3.629 0.9497 24.122 0.0876 2.226 1 1/8 UNF 1.125 28.575 12 2.117 1.0228 25.979 0.0511 1.298 M30 Coarse 1.1811 30 7.3 3.500 1.012 25.706 0.0845 2.147 M30 Fine 1.1811 30 12.7 2.000 1.0845 27.546 0.0483 1.226 1 3/16 ADM 1.1875 30.163 12 2.117 1.0808 27.452 0.0534 1.355 7/8 BSP 1.189 30.201 14 1.814 1.098 27.889 0.0457 1.161 -13 THURY 1.2048 31 6.5 3.930 7/8 WPIPE 1.2188 30.956 14 1.814 1.1298 28.696 0.0445 1.13 1 1/4 BRASS 1.25 31.75 26 0.977 1.2008 30.5 0.0246 0.625 1 1/4 BSF 1.25 31.75 9 2.822 1.1078 28.138 0.0711 1.806 1 1/4 UNC 1.25 31.75 7 3.629 1.0747 27.297 0.0876 2.226 1 1/4 UNF 1.25 31.75 12 2.117 1.1478 29.154 0.0511 1.298 1 1/4 WHIT 1.25 31.75 7 3.629 1.067 27.102 0.0915 2.324 1 1/4 ADM 1.25 31.75 12 2.117 1.1433 29.039 0.0534 1.355 M33 Coarse 1.2992 33 7.3 3.500 1.1302 28.706 0.0845 2.147 1 BSP 1.309 33.249 11 2.309 1.193 30.302 0.0582 1.478 1 5/16 ADM 1.3125 33.338 12 2.117 1.2058 30.627 0.0534 1.355 1 WPIPE 1.3438 34.131 11 2.309 1.2278 31.185 0.058 1.473 1 3/8 ADM 1.375 34.925 12 2.117 1.2683 32.214 0.0534 1.355 1 3/8 BSF 1.375 34.925 8 3.175 1.215 30.861 0.08 2.032 1 3/8 UNC 1.375 34.925 6 4.233 1.1705 29.731 0.1022 2.597 1 3/8 UNF 1.375 34.925 12 2.117 1.2728 32.329 0.0511 1.298 -14 THURY 1.3858 35.2 5.8 4.370 M36 Coarse 1.4173 36 6.4 4.000 1.2241 31.092 0.0966 2.454 M36 Fine 1.4173 36 8.5 3.000 1.2724 32.319 0.0725 1.841 1 7/16 ADM 1.4375 36.513 12 2.117 1.3308 33.802 0.0534 1.355 Pg29 COND 1.457 37 16 1.588 1.397 35.48 0.0299 0.76 1 1/2 ADM 1.5 38.1 12 2.117 1.3933 35.389 0.0534 1.355 1 1/2 BRASS 1.5 38.1 26 0.977 1.4508 36.85 0.0246 0.625 1 1/2 BSF 1.5 38.1 8 3.175 1.34 34.036 0.08 2.032 1 1/2 UNC 1.5 38.1 6 4.233 1.2955 32.906 0.1022 2.597 1 1/2 UNF 1.5 38.1 12 2.117 1.3978 35.504 0.0511 1.298 1 1/2 WHIT 1.5 38.1 6 4.233 1.2866 32.68 0.1067 2.71 M39 Coarse 1.5354 39 6.4 4.000 1.3422 34.092 0.0966 2.454 -15 THURY 1.5748 40 5.2 4.860 1 5/8 BSF 1.625 41.275 8 3.175 1.4649 37.208 0.08 2.032 M42 Coarse 1.6535 42 5.6 4.500 1.4362 36.479 0.1087 2.761 M42 Fine 1.6535 42 8.5 3.000 1.5065 38.265 0.0725 1.841 1 1/4 WPIPE 1.6875 42.863 11 2.309 1.5715 39.916 0.058 1.473 1 3/4 1.75 44.45 5 5.080 1.4939 37.945 0.1281 3.254 1 3/4 BSF 1.75 44.45 7 3.629 1.567 39.802 0.0915 2.324 1 3/4 UNC 1.75 44.45 5 5.080 1.5046 38.217 0.1227 3.116 M45 Coarse 1.7717 45 5.6 4.500 1.5543 39.479 0.1087 2.761 -16 THURY 1.7874 45.4 4.7 5.400 Pg36 COND 1.850 47 16 1.588 1.791 45.48 0.0299 0.76 M48 Coarse 1.8898 48 5.1 5.000 1.6482 41.865 0.1208 3.067 M48 Fine 1.8898 48 8.5 3.000 1.7433 44.28 0.0725 1.841 1 1/2 WPIPE 1.9063 48.419 11 2.309 1.7903 45.472 0.058 1.473 2 BSF 2 50.8 7 3.629 1.817 46.152 0.0915 2.324 2 UNC 2 50.8 4.5 5.644 1.7274 43.876 0.1363 3.463 2 WHIT 2 50.8 4.5 5.644 1.7154 43.571 0.1423 3.614 -17 THURY 2.0276 51.5 4.2 6.000 M52 Coarse 2.0472 52 5.1 5.000 1.8057 45.865 0.1208 3.067 Pg42 COND 2.126 54 16 1.588 2.066 52.48 0.0299 0.76 1 3/4 WPIPE 2.1563 54.769 11 2.309 2.0403 51.822 0.058 1.473 M56 Coarse 2.2047 56 4.6 5.500 1.9391 49.252 0.1328 3.374 M56 Fine 2.2047 56 6.4 4.000 2.0115 51.093 0.0967 2.455 2 1/4 BSF 2.25 57.15 6 4.233 2.0366 51.73 0.1067 2.71 -18 THURY 2.2992 58.4 3.8 6.660 Pg48 COND 2.335 59.3 16 1.588 2.275 57.78 0.0299 0.76 M60 Coarse 2.3622 60 4.6 5.500 2.0965 53.252 0.1328 3.374 2 WPIPE 2.375 60.325 11 2.309 2.259 57.379 0.058 1.473 2 1/2 BSF 2.5 63.5 6 4.233 2.2866 58.08 0.1067 2.71 M64 Coarse 2.5197 64 4.2 6.000 2.2299 56.639 0.1449 3.681 M64 Fine 2.5197 64 6.4 4.000 2.3254 59.065 0.0967 2.455 -19 THURY 2.6102 66.3 3.4 7.400 2 1/4 WPIPE 2.625 66.675 11 2.309 2.509 63.729 0.058 1.473 M68 Coarse 2.6772 68 4.2 6.000 2.3874 60.639 0.1449 3.681 2 3/4 BSF 2.75 69.85 6 4.233 2.5366 64.43 0.1067 2.71 -20 THURY 2.9606 75.2 3.1 8.230 2 1/2 WPIPE 3 76.2 11 2.309 2.884 73.254 0.058 1.473 3 BSF 3 76.2 5 5.080 2.7439 69.695 0.128 3.251 2 3/4 WPIPE 3.25 82.55 11 2.309 3.134 79.604 0.058 1.473 3 WPIPE 3.5 88.9 11 2.309 3.384 85.954 0.058 1.473 3 1/4 WPIPE 3.75 95.25 11 2.309 3.634 92.304 0.058 1.473 5 1/2 WPIPE 4 101.6 11 2.309 3.884 98.654 0.058 1.473 3 3/4 WPIPE 4.25 107.95 11 2.309 4.134 105.004 0.058 1.473 4 WPIPE 4.5 114.3 11 2.309 4.384 111.354 0.058 1.473 4 1/2 WPIPE 5 127 11 2.309 4.884 124.054 0.058 1.473 5 WPIPE 5.5 139.7 11 2.309 5.384 136.754 0.058 1.473 5 1/2 WPIPE 6 152.4 11 2.309 5.884 149.454 0.058 1.473 6 WPIPE 6.5 165.1 11 2.309 6.384 162.154 0.058 1.473 "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