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Junior Member

169 Posts

Posted - 01/09/2018 :  12:11:04 AM  Show Profile  Reply with Quote
I have an old (1924) Reising semi-aoto .22 that I'm trying to clean-up the screws and holes to mount the grips. From my limited knowledge I've measured the screws at .125" diameter with 56 tpi. Would this be a 5-56NF? From my searches I'm finding that taps and dies are non-existent for this size. Can anyone help me find this or tell me if I'm off base in my sizing?

Advanced Member

18284 Posts

Posted - 01/09/2018 :  01:50:07 AM  Show Profile  Reply with Quote
Wouldn't be National Fine, as that's 44 TPI, for .0125 diameter, #5 screw. The screw size for 56 TPI, is #3, with a much smaller diameter.

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Advanced Member

5847 Posts

Posted - 01/09/2018 :  01:57:29 AM  Show Profile  Reply with Quote
A #5 is 0.12 close to an 1/8. 56 TPI is usually #3. Gun screws are often weird and usually have finer pitches so you could be spot on.

One for sale, maybe they would look for you.

I think you can get both a tap and die made in that size for $.

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Junior Member

450 Posts

Posted - 01/09/2018 :  02:02:08 AM  Show Profile  Reply with Quote
That is a standard but seldom used U. S. Standard thread. High Standard used that thread for their grip screws and side plate screws. I believe Brownells sells the old High Standard grip screws. You might contact them.

John Stimson, Jr.
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Advanced Member

8856 Posts

Posted - 01/09/2018 :  12:00:57 PM  Show Profile  Reply with Quote
#5-56 UNS

Tap is around $45 to your door.
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Advanced Member

36686 Posts

Posted - 01/14/2018 :  8:35:18 PM  Show Profile  Reply with Quote
besides Brownells screw kit and good dies and taps years ago i went to Boeing surplus in wichita and they had big drums of screws/??? on pallets and you dipped out scoops of however much you wanted and it sold by the pound ..has served me well for years
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