PLEASE NOTE PHOTO IS FOR ILLUSTRATION PURPOSE ONLY,ACTUAL ONE SUPPLIED MY VARY IN DESIGN.
YOU CANNOT MEASURE A BSP THREAD WITH A RULER/TAPE MEASURE
Check chart below on how to use BSP sizes
| G / R size | Thread pitch | Major diameter | Minor diameter | Gauge length | Tapping drill | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| R 95% | G 80% | |||||||||
| (in) | (in−1) | (mm) | (in) | (mm) | (in) | (mm) | (in) | (mm) | (mm) | (mm) |
| 1⁄16 | 28 | 0.907 | 0.3041 | 7.723 | 0.2583 | 6.561 | 5⁄32 | 4.0 | 6.6 | 6.8 |
| 1⁄8 | 28 | 0.907 | 0.3830 | 9.728 | 0.3372 | 8.566 | 5⁄32 | 4.0 | 8.6 | 8.8 |
| 1⁄4 | 19 | 1.337 | 0.5180 | 13.157 | 0.4506 | 11.445 | .2367 | 6.0 | 11.5 | 11.8 |
| 3⁄8 | 19 | 1.337 | 0.6560 | 16.662 | 0.5886 | 14.950 | 1⁄4 | 6.4 | 15.0 | 15.3 |
| 1⁄2 | 14 | 1.814 | 0.8250 | 20.955 | 0.7335 | 18.631 | .3214 | 8.2 | 18.7 | 19.1 |
| 5⁄8 | 14 | 1.814 | 0.9020 | 22.911 | 0.8105 | 20.587 | .3214 | 8.2 | 20.7 | 21.1 |
| 3⁄4 | 14 | 1.814 | 1.0410 | 26.441 | 0.9495 | 24.117 | 3⁄8 | 9.5 | 24.2 | 24.6 |
| 7⁄8 | 14 | 1.814 | 1.1890 | 30.201 | 1.0975 | 27.877 | 3⁄8 | 9.5 | 28.0 | 28.3 |
| 1 | 11 | 2.309 | 1.3090 | 33.249 | 1.1926 | 30.291 | .4091 | 10.4 | 30.4 | 30.9 |
| 11⁄8 | 11 | 2.309 | 1.4920 | 37.897 | 1.3756 | 34.939 | .4091 | 10.4 | 35.1 | 35.5 |
| 11⁄4 | 11 | 2.309 | 1.6500 | 41.910 | 1.5335 | 38.952 | 1⁄2 | 12.7 | 39.1 | 39.5 |
| 13⁄8 | 11 | 2.309 | 1.7450 | 44.323 | 1.6285 | 41.365 | 1⁄2 | 12.7 | 41.5 | 42.0 |
| 11⁄2 | 11 | 2.309 | 1.8820 | 47.803 | 1.7656 | 44.845 | 1⁄2 | 12.7 | 45.0 | 45.4 |
| 15⁄8 | 11 | 2.309 | 2.0820 | 52.883 | 1.9656 | 49.926 | 5⁄8 | 15.9 | 50.1 | 50.5 |
| 13⁄4 | 11 | 2.309 | 2.1160 | 53.746 | 1.9995 | 50.788 | 5⁄8 | 15.9 | 50.9 | 51.4 |
| 17⁄8 | 11 | 2.309 | 2.2440 | 56.998 | 2.1276 | 54.041 | 5⁄8 | 15.9 | 54.2 | 54.6 |
| 2 | 11 | 2.309 | 2.3470 | 59.614 | 2.2306 | 56.656 | 5⁄8 | 15.9 | 56.8 | 57.2 |
| 21⁄4 | 11 | 2.309 | 2.5870 | 65.710 | 2.4706 | 62.752 | 11⁄16 | 17.5 | 62.9 | 63.3 |
| 21⁄2 | 11 | 2.309 | 2.9600 | 75.184 | 2.8435 | 72.226 | 11⁄16 | 17.5 | 72.4 | 72.8 |
| 23⁄4 | 11 | 2.309 | 3.2100 | 81.534 | 3.0935 | 78.576 | 13⁄16 | 20.6 | 78.7 | 79.2 |
| 3 | 11 | 2.309 | 3.4600 | 87.884 | 3.3435 | 84.926 | 13⁄16 | 20.6 | 85.1 | 85.5 |
| 31⁄4 | 11 | 2.309 | 3.7000 | 93.980 | 3.5835 | 91.022 | 7⁄8 | 22.2 | 91.2 | 91.6 |
| 31⁄2 | 11 | 2.309 | 3.9500 | 100.330 | 3.8335 | 97.372 | 7⁄8 | 22.2 | 97.5 | 98.0 |
| 33⁄4 | 11 | 2.309 | 4.2000 | 106.680 | 4.0835 | 103.722 | 7⁄8 | 22.2 | 103.9 | 104.3 |
| 4 | 11 | 2.309 | 4.4500 | 113.030 | 4.3335 | 110.072 | 1 | 25.4 | 110.2 | 110.7 |
| 41⁄2 | 11 | 2.309 | 4.9500 | 125.730 | 4.8335 | 122.772 | 1 | 25.4 | 122.9 | 123.4 |
| 5 | 11 | 2.309 | 5.4500 | 138.430 | 5.3335 | 135.472 | 11⁄8 | 28.6 | 135.6 | 136.1 |
| 51⁄2 | 11 | 2.309 | 5.9500 | 151.130 | 5.8335 | 148.172 | 11⁄8 | 28.6 | 148.3 | 148.8 |
| 6 | 11 | 2.309 | 6.4500 | 163.830 | 6.3335 | 160.872 | 11⁄8 | 28.6 | 161.0 | 161.5 |
| 7 | 10 | 2.540 | 7.4500 | 189.230 | 7.3220 | 185.979 | 13⁄8 | 34.9 | 186.1 | 186.6 |
| 8 | 10 | 2.540 | 8.4500 | 214.630 | 8.3220 | 211.379 | 11⁄2 | 38.1 | 211.5 | 212.0 |
| 9 | 10 | 2.540 | 9.4500 | 240.030 | 9.3220 | 236.779 | 11⁄2 | 38.1 | 236.9 | 237.4 |
| 10 | 10 | 2.540 | 10.4500 | 265.430 | 10.3220 | 262.179 | 15⁄8 | 41.3 | 262.3 | 262.8 |
| 11 | 8 | 3.175 | 11.4500 | 290.830 | 11.2900 | 286.766 | 15⁄8 | 41.3 | 287.0 | 287.6 |
| 12 | 8 | 3.175 | 12.4500 | 316.230 | 12.2900 | 312.166 | 15⁄8 | 41.3 | 312.4 | 313.0 |
| 13 | 8 | 3.175 | 13.6800 | 347.472 | 13.5200 | 343.408 | 15⁄8 | 41.3 | 343.6 | 344.2 |
| 14 | 8 | 3.175 | 14.6800 | 372.872 | 14.5200 | 368.808 | 13⁄4 | 44.5 | 369.0 | 369.6 |
| 15 | 8 | 3.175 | 15.6800 | 398.272 | 15.5200 | 394.208 | 13⁄4 | 44.5 | 394.4 | 395.0 |
| 16 | 8 | 3.175 | 16.6800 | 423.672 | 16.5200 | 419.608 | 17⁄8 | 47.6 | 419.8 | 420.4 |
| 17 | 8 | 3.175 | 17.6800 | 449.072 | 17.5200 | 445.008 | 2 | 50.8 | 445.2 | 445.8 |
| 18 | 8 | 3.175 | 18.6800 | 474.472 | 18.5200 | 470.408 | 2 | 50.8 | 470.6 | 471.2 |
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