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Old 08-30-2020, 02:13 AM
Hondo44 Hondo44 is offline
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Originally Posted by Milton View Post
I have the noted revolver( 1922 manufactured ? ) that needs the threads cleaned up in the frame of the revolver where the rear most side plate screw fits.
What size tap do I need for this?
For pre WWII I, K, and N frame Smiths, it's a proprietary size: slightly smaller diameter (.118") than a National fine #5 (.122") x 44. So don't run a #5 x 44 too much past the point of the tap or it'll be too big for the original screw.

If you have to go deeper to clean up the threads, get a post war S&W #5 x 44 side plate screw so it's not too loose in the hole.

3 x 48 if it's a .22 M frame
S&WCA #819

Last edited by Hondo44; 08-30-2020 at 03:36 AM.
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