Löwenherz Thread

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 thread angle is 53° 8'.

Major
Diameter
mm		 Tapping
Drill Size
mm		 Pitch
mm		 Wrench Size
mm
1.000 0.625 0.250 3
1.200 0.825 0.250 4
1.400 0.950 0.300 5
1.700 1.175 0.350 5
2.000 1.400 0.400 6
2.300 1.700 0.400 6
2.600 1.925 0.450 7
3.000 2.250 0.500 7
3.500 2.600 0.600 8
4.000 2.950 0.700 8
4.500 3.375 0.750 10
5.000 3.800 0.800 10
5.500 4.150 0.900 12
6.000 4.500 1.000 12
7.000 5.350 1.100 14
8.000 6.200 1.200 14
9.000 7.050 1.300 17
10.000 7.900 1.400 17

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