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Clock screw thread. This thread was developed by engineer and university professor Thury from Geneva before 1900. The flank angle is 47.5°. Advertising: Thread No. | Major Diameter mm | Pitch mm | Tapping Drill Size mm | 0 | 6.000 | 1.000 | 4.800 | 1 | 5.290 | 0.900 | 4.220 | 2 | 4.660 | 0.810 | 3.728 | 3 | 4.110 | 0.729 | 3.224 | 4 | 3.620 | 0.656 | 2.808 | 5 | 3.190 | 0.590 | 2.492 | 6 | 2.810 | 0.530 | 2.164 | 7 | 2.480 | 0.480 | 1.924 | 8 | 2.180 | 0.430 | 1.684 | 9 | 1.920 | 0.390 | 1.432 | 10 | 1.640 | 0.349 | 1.280 | 11 | 1.490 | 0.310 | 1.128 | 12 | 1.320 | 0.280 | 0.964 | 13 | 1.160 | 0.250 | 0.900 | 14 | 1.102 | 0.230 | 0.724 | 15 | 0.901 | 0.210 | 0.648 | 16 | 0.794 | 0.190 | 0.562 | 17 | 0.699 | 0.170 | 0.496 | 18 | 0.616 | 0.150 | 0.440 | 19 | 0.543 | 0.140 | 0.372 | 20 | 0.479 | 0.120 | 0.336 | 21 | 0.426 | 0.110 | 0.288 | 22 | 0.372 | 0.099 | 0.252 | 23 | 0.328 | 0.089 | 0.223 | 24 | 0.289 | 0.080 | 0.194 | 25 | 0.254 | 0.072 | 0.164 |  |
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