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Screw threads.


Stour-boy
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Stour-boy,

The problem with gunmakers is that they used anything to hand at the time of manufacture.

You do need to remember that metric can be various metric pitches. If the gun ever had a sniff of Birmingham it could be a number of threads from bsf, ba, bc etc.

Measure the diameter if it is a metric size it will be a metric thread, if it is an inch fractional size it will be a british thread. Once you have the diameter and thread pitch you should be able to sort it out using 'Google / thread sizes'

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You do need to remember that metric can be various metric pitches

 

Casting my mind back I can remember a reference to "French metric" could be wrong ?

 

Unless you can measure the Dia"/Pitch you'll probably never know for sure, if there's a Toolroom/Engineering place not far from you it could be worth a visit, failing that just convert them to metric yourself.

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