Anyone know the thread/tap size for the screws that attach the trigger guard to a Argentine 1909? One of the screws was threaded incorrectly by the previous owner, and I can't seat the trigger guard properly. I was hoping to rethread and retap it.
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Anyone know the thread/tap size for the screws that attach the trigger guard to a Argentine 1909? One of the screws was threaded incorrectly by the previous owner, and I can't seat the trigger guard properly. I was hoping to rethread and retap it.
I just measured on my 1908 Brazilean rifle. Argentine should be the same.
Measured 6.43 on shank, 22 tpi (close) from thread gauge.
Allowing for production tolerances, that sounds like it could have been a nominal 6.5 mm x 1.2 mm pitch in round-number metric units. But no guarantee!
In "The Mauser Bolt Actions" by Jerry Kuhnhausen it says: 0.250" x 22. But because of the shank measurement, which is way over 1/4", I would be a bit cautious in assuming that Mauser used precise inch dimensions. Get someone to thread a piece of rod to 0.250" x 22 and try it!
Patrick
I think the .250-22 thing came about as a "close enough" substitute that could be made on non metric lathes. However, I'm just a machinist, not a real Mauser guy...
In the past, I've used Scott Stonehill for hard to find screws ... :)
Evans Obsolete Screws (click here)
Regards,
Badger
I still find it amazing that I found a 1/4x30 tpi tap and die at a boot sale in York. Guess what they are good for!
Patrick
The screws I am good on. Its just a matter or retapping the attachment point on the receiver.Quote:
Originally Posted by Badger
So what IS it good for? Something too obvious for my pea brain to dredge up...Quote:
Originally Posted by Patrick Chadwick
...Lee Metford and Lee Enfield front trigger guard screws, including all SMLE types, also P14 and M1917 (but not No 4 and later - those are 1/4" x26 BSF);).
Patrick
Patrick- I note you are in Germany. Are there any German gunsmiths who could re-tap that Argy Mauser? Just a thought.
I knew it would be something obvious:madsmile:. Never had to made or repair any of those, but I've scads of SMLE front screws...Quote:
Originally Posted by Patrick Chadwick
So what about the 1909 Mauser screws? Somebody ought to have all that info squirreled away (that lives in Metricland, that is!).
tower06 and Calif-Steve.
It is difficult to give relevant advice if one doesn't even know in which country you are located. In Germany it is no problem to get the correct trigger guard screws. Elsewhere, Evans Obsolete Screws (as suggested by Badger) is an obvious possibility. And you don't need a gunsmith to cut a screw thread for a trigger guard screw. For myself, I would never try to recut the boss on the system to a different thread. That woul dpresent enormous problems with residual wall thickness on the boss and trigger guard screw holes. Up to now, the most I have found necessary was to clean out the thread.
The old dodge for this is to get hold of one of the correct screws and grind a slot along the side, to make it into a crude one-flute tap. This can then be used to clean up the female thread in the threaded boss.
jmoore: 1909 screws are no different from any other of the Gew98/Kar98 family, as far as I can tell. But your question is a good one. I have never actually seen a table of Mauser screw usage. If I find one I shall certainly make it available to the forum.
Patrick
Patrick, I'm reviving this thread to ask: Have you come across a "table of Mauser screw usage"? (Anyone else? Feel free to speak up!)Quote:
Originally Posted by Patrick Chadwick
Regarding making a screw into an ersatz tap: I need to chase the threads in the nosecap of a 1909 Argentine Cavalry Carbine. The surplus screw I obtained for this was putty-soft and broke off. (I think I have that handled.) Do you think there might be a way to harden another one of these surplus screws to make it more servicable as an impromptu chasing tap?