Stith Side Scope Mount Screw Thread Size

[concretus]

Hello,
Would anyone by chance know the thread size of the (5ea) screws used to mount the Stith type side scope mount? Thanks.

[Rifleman]

Unless anyone posts the answer, I'll take one off of a Stith I have on a Savage 99 and see what that is. Assume it would be the same for a Remington 8/81.

[Hibby83]

I wish i had a way to measure the pitch on the screws, any thread pitch gauge i have access to doesn't go that small.

Pure guess from looking at other posts on the forum. 5-48 range ???

Best would be a good genuine gunsmith or well outfitted gun shop to help.

[Phyrbird]

I got one of these in SAE & metric:

https://www.amazon.com/Screw-Chekr-Thre ... 20&sr=8-20

Works great for testing & is hard enough to act as a file plate to clean up cut offs. It is not hard enough to act as a shear though..
I recall the Lyman 41AT is supposed to be 5-28 but one of mine is a 6-32, so be aware this is not set in stone.

[concretus]

My gunsmith and I have a feeling they are 8-40 thread.

[Sarge756]

Have a couple extra Stith sets with screws. The screws are 6-48. Couldnt find my pitch gauge but did a side by side with a 6-48 from my Weaver scope screw kit and it matches up.
Joe

[concretus]

I’ll check. Thank… I want to take off the mount and place plugs in the holes so I want yo get the right size.

[concretus]

I’m digging the ideas of an attaching piece of picatinny rail using the holes for the rear sight and placing an Sig Romeo 5 RDO on it. Anyone know the hole spacing for the rear sight?