Ducommun Steinle Thread

Thread for mechanical and optical instruments, established in 1873 by the Ducommunschen Werkstätten (Heilmann, Ducommun & Steinle) in Mülhausen i. E.
The flank angle is 60°.

Major Diameter mm	Pitch mm	Tapping Drill Size mm
3.00	0.50	2.33
4.00	0.75	3.00
5.00	0.75	4.00
6.00	1.00	4.67
7.00	1.25	5.33
8.00	1.25	6.33
9.00	1.50	7.00
10.00	1.50	8.00
12.00	1.75	9.67
15.00	2.00	12.33
18.00	2.50	14.67
20.00	2.50	16.67
23.00	3.00	19.00
25.00	3.00	21.00
28.00	3.00	24.00
30.00	3.50	25.33
32.00	3.50	27.33
35.00	4.00	29.67
38.00	4.00	31.67
40.00	4.00	34.68
45.00	4.50	39.00
48.00	5.00	40.33
50.00	5.00	43.33
55.00	5.00	48.33
60.00	6.00	52.00
65.00	6.00	57.00
70.00	7.00	60.67
75.00	7.00	65.67
80.00	7.00	70.67
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