Luger Grip Screw Thread Size

DonVoigt · 03-03-2017, 02:58 PM

The first screw machines they bought were from the UK, at least that is what I read.
Whitworth predates "standardized" metric pitches, IIRC.

The luger screws and threads are a hybrid, metric diameters and TPI. Whitworth is a 55 degree angle thread, the current standard is 60 degrees, so depending on the use/tolerance/number of threads, a 30 TPI Whitworth will "fit"(close enough) a 30 TPI modern thread.

Changing the gearing from TPI to metric is a bear and old "english system" lathes just won't do it.

03-03-2017, 02:58 PM	#22
DonVoigt User Join Date: Apr 2015 Location: near Charlotte NC Posts: 4,683 Thanks: 1,443 Thanked 4,358 Times in 2,042 Posts	The first screw machines they bought were from the UK, at least that is what I read. Whitworth predates "standardized" metric pitches, IIRC. The luger screws and threads are a hybrid, metric diameters and TPI. Whitworth is a 55 degree angle thread, the current standard is 60 degrees, so depending on the use/tolerance/number of threads, a 30 TPI Whitworth will "fit"(close enough) a 30 TPI modern thread. Changing the gearing from TPI to metric is a bear and old "english system" lathes just won't do it. __________________ 03man(Don Voigt); Luger student and collector. Looking for DWM side plate: 69 ; Dreyse 1907 pistol K.S. Gendarmerie

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