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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 flank angle is 53° 8'.

Major	Tapping	Pitch	Wrench Size
Diameter	Drill Size	mm	mm
mm	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