Does anyone know the size of the screws that hold the grips on a Webley mk 1 pistol? I thought that they might have been 3ba or 4ba but they don;t seem to be. Can one of you engineers types measure up and get the thread gauge out please? Thanks
Does anyone know the size of the screws that hold the grips on a Webley mk 1 pistol? I thought that they might have been 3ba or 4ba but they don;t seem to be. Can one of you engineers types measure up and get the thread gauge out please? Thanks
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9/64" x 36TPI x 3/8" - Head Diameter 3/8" - Pan Head Depth (Approx.) 3/32" (Centre)
Last edited by Troubledshooter; 09-11-2011 at 02:11 AM. Reason: Adjusted measurements
Sounds like it's British Standard Whitworth (BSW)
1/8" BSW (8/64") is 40 tpi
5/32" BSW (10/64") is 32 tpi
So logic suggests that 9/64" x 36 tpi, a diameter and pitch sitting midway between those, would be from the same thread series.
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If you need to tap a thread to take the grip screw, you can get away with using a 4mm tap. The fit is a bit loose but the screw will go in and tighten up.
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It's not listed in any of my thread charts, but I'm awaiting a call from a 'thread expert' who may be able to identify it.
Apparently, the coloquial term for these odd threads as used in older gun manufacture, is 'Enfield Thread'.
Update: Tracy Tools have one tap with the size 9/64 x 36tpi on it, but, unfortunately, it doesn't say what specific thread form it is.
Last edited by Troubledshooter; 09-11-2011 at 01:33 PM. Reason: Update.