Specifications of historical Thread Standards

Clock screw thread.
This thread was developed by engineer and university professor Thury from Geneva before 1900.
The flank angle is 47.5°.

Thread No.Major Diameter
mm
Pitch
mm
Tapping Drill Size
mm
06.0001.0004.800
15.2900.9004.220
24.6600.8103.728
34.1100.7293.224
43.6200.6562.808
53.1900.5902.492
62.8100.5302.164
72.4800.4801.924
82.1800.4301.684
91.9200.3901.432
101.6400.3491.280
111.4900.3101.128
121.3200.2800.964
131.1600.2500.900
141.1020.2300.724
150.9010.2100.648
160.7940.1900.562
170.6990.1700.496
180.6160.1500.440
190.5430.1400.372
200.4790.1200.336
210.4260.1100.288
220.3720.0990.252
230.3280.0890.223
240.2890.0800.194
250.2540.0720.164
Thury Thread