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Re: Thread size

Posted by Pete Nelson on Sunday, 16 May 2010, at 10:00 p.m., in response to Re: Thread size, posted by Ernie on Sunday, 16 May 2010, at 5:36 p.m.

Hello, "Son",

I think that the biggest probably would be finding a "bottoming" tap of that size since it is such a shallow blind hole. I was putting together a mock-up showing how the Allin Breech System works to take to one of the gun shows last year and using a Barreled Action (from Al) with had a barrel with a beautiful outside finish but a "shot-out, pitted, pretty lousy bore". One of the two Rear Sight Screw holes has some slightly "buggered" threads, so I compromised and made myself a "bottoming" tap out of a brand-new #8-32 with the tikp round off the the threads cleaned up and squared off with a small whetstone in my Dremel rotary tool. I wouldn't use that method with a nice "minty" show Rifle or Carbine, but for this mock-up it actually workerd out pretty decently. I could at least get the slotless screws (for an M1873 Rear Sight) to both go in and bottom.

I had solicited the dealer to whom I was alluding in my earlier post to see whether he was interested in having his tap/die supplier make up some of the other taps/dies for other of the Springfield threads:

TANG SCREW: 0.215"-26

TRIGGER PIVOT SCREW: 0.116"-26

and others.

The Hammer Screw appears to be a 0.187"-26 and the (2) Lock Assembly Screws (which pass through the Stock) are a 0.195"-26, and those are the (2) which came in my tap/die set I bought from him.

And as best I could measure it, the Breech Screw (and the fermale thread at the rear of the Receiver) is a 0.712"-16 pitch Buttress-type thread (perhaps a modified Whitworth). I had begun to canvass a number of tool & die firms (like Vermont and others), but I couldn't find anybody interested unless I were talking large-volume orders.

Best,

PETE


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