Specifications of historical Thread Standards

Precision mechanic thread. Was mainly used in Germany and Austria.
Originally it was a V-Thread. The flattened form was admitted as standard on the Congress for Introduction of Standardized Threads for Fixing Screws in Fine Mechanics which was held in Munich in 1892. Was replaced by the metric thread DIN 13 later.
The flank angle is 53° 8'.

Major
Diameter
mm
Tapping
Drill Size
mm
Pitch
mm
Wrench Size
mm
1.0000.6250.2503
1.2000.8250.2504
1.4000.9500.3005
1.7001.1750.3505
2.0001.4000.4006
2.3001.7000.4006
2.6001.9250.4507
3.0002.2500.5007
3.5002.6000.6008
4.0002.9500.7008
4.5003.3750.75010
5.0003.8000.80010
5.5004.1500.90012
6.0004.5001.00012
7.0005.3501.10014
8.0006.2001.20014
9.0007.0501.30017
10.0007.9001.40017
Löwenherz Thread