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Siemens and Halske Thread German electrical engineering company that later became part of Siemens AG. Siemens & Halske Thread was used in telephones around 1900 AD. Siemens and Halske | Thread No. | Major Diameter mm | Tapping Drill Size mm | Pitch mm | Thread Angle ° | | 11 | 8,95 | 7,0 | 1,21 | 50 | | 14 | 7,20 | 5,7 | 1,05 | 58 | | 17 | 6,00 | 4,6 | 0,89 | 55 | | 18 | 5,75 | 4,5 | 0,78 | 58 | | 21 | 5,12 | 4,0 | 0,78 | 58 | | 25 | 4,00 | 3,18 | 0,66 | 61 | | 27 | 3,37 | 2,58 | 0,66 | 68 | | 29 | 2,80 | 2,22 | 0,53 | 66 | | 31 | 2,16 | 1,63 | 0,49 | 68 | | 33 | 1,78 | 1,39 | 0,34 | 59 | | 34 | 1,63 | 1,29 | 0,30 | 55 | | 36 | 1,22 | 0,95 | 0,22 | 50 |
See also: Thread.
  
Subjects:- Mechanical Engineering
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