3/16 x 30

This topic has 3 replies, 3 voices, and was last updated 5 August 2026 at 21:25 by Jim Nic.

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5 August 2026 at 17:41 #859507
Peter Howell 1
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@peterhowell1
In a job lot of second hand dies there is one marked 3/16 x 30. I can’t find this thread in any of my charts. Can anyone help identify it?

Peter
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5 August 2026 at 18:20 #859514
Roderick Jenkins
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@roderickjenkins93242
A.I Says:

“A 3/16″ x 30 TPI thread is a rare British Whitworth-form screw specification famously used for grip retention screws on historical firearms like the German Luger pistol, featuring a 55-degree thread angle rather than the modern standard 60-degree profile.”
5 August 2026 at 19:46 #859518
Peter Howell 1
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@peterhowell1
Interesting. Most of the others were BA and BSF, I wonder where it came from.
5 August 2026 at 21:25 #859533
Jim Nic
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@jimnic
I have a set of taps and die 3/16 x 30 in the Model Engineer thread form as well as others of varying sizes. They produce a fine thread used in steam pipe fittings.

Jim
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3/16 x 30

3/16 x 30

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