Specifications of historical Thread Standards

Siemens & Halske Thread was used in telephones approx. 1900 AD.
The flank angle ranges from 50° to 68°.

Thread No.
 
Major Diameter
mm
Tapping Drill Size
mm
Pitch
mm
Thread Angle
°
118.957.01.2150
147.205.71.0558
176.004.60.8955
185.754.50.7858
215.124.00.7858
254.003.180.6661
273.372.580.6668
292.802.220.5366
312.161.630.4968
331.781.390.3459
341.631.290.3055
361.220.950.2250
S & H Gewinde