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British fine thread for clocks and optical devices. The flank angle is 47.5°. Advertising: Thread No. | Major Diameter mm | Major Diameter Inch | Pitch mm | TPI | Tapping Drill Size mm | 10 | 0.254 | 0.010 | 0.064 | 400 | 0.173 | 11 | 0.279 | 0.011 | 0.064 | 400 | 0.198 | 12 | 0.305 | 0.012 | 0.073 | 350 | 0.212 | 13 | 0.330 | 0.013 | 0.073 | 350 | 0.237 | 14 | 0.356 | 0.014 | 0.085 | 300 | 0.247 | 16 | 0.406 | 0.016 | 0.085 | 300 | 0.298 | 17 | 0.432 | 0.017 | 0.102 | 250 | 0.302 | 18 | 0.457 | 0.018 | 0.102 | 250 | 0.327 | 19 | 0.483 | 0.019 | 0.102 | 250 | 0.353 | 20 | 0.508 | 0.020 | 0.121 | 210 | 0.353 | 22 | 0.559 | 0.022 | 0.121 | 210 | 0.404 | 24 | 0.610 | 0.024 | 0.121 | 210 | 0.455 | 26 | 0.660 | 0.026 | 0.141 | 180 | 0.480 | 28 | 0.711 | 0.028 | 0.141 | 180 | 0.531 | 30 | 0.762 | 0.030 | 0.141 | 180 | 0.581 | 32 | 0.813 | 0.032 | 0.141 | 180 | 0.632 | 34 | 0.864 | 0.034 | 0.169 | 150 | 0.647 | 36 | 0.914 | 0.036 | 0.169 | 150 | 0.698 | 38 | 0.965 | 0.038 | 0.212 | 120 | 0.694 | 40 | 1.016 | 0.040 | 0.212 | 120 | 0.745 | 45 | 1.143 | 0.045 | 0.212 | 120 | 0.872 | 50 | 1.270 | 0.050 | 0.254 | 100 | 0.945 | 55 | 1.397 | 0.055 | 0.254 | 100 | 1.072 | 60 | 1.524 | 0.060 | 0.254 | 100 | 1.199 | 65 | 1.651 | 0.065 | 0.318 | 80 | 1.245 | 70 | 1.778 | 0.070 | 0.318 | 80 | 1.372 | 75 | 1.905 | 0.075 | 0.318 | 80 | 1.499 | 80 | 2.032 | 0.080 | 0.423 | 60 | 1.490 | 85 | 2.159 | 0.085 | 0.423 | 60 | 1.617 | 90 | 2.286 | 0.090 | 0.423 | 60 | 1.744 | 95 | 2.286 | 0.095 | 0.508 | 50 | 1.636 | 100 | 2.540 | 0.100 | 0.508 | 50 | 1.890 |  |
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