Ruger scope ring thread

[1stmar]

Does anyone know what the threads are for ruger rings?
8-40 or 6-48?

 

[Dixie Gunsmithing]

I'm pretty sure the rail screws are 6-48.

 

[1stmar]

Thanks Dixie I'm looking for the screws for the clamshell not the bases

 

[Dixie Gunsmithing]

Are all the clamp screws missing? I think they are the same, but if you have one, a number 6 screw's O.D. (rod size) is 0.138", and a number 8, is 0.164". A number 6 would just barely be over 1/8" in diameter.

 

[g.willikers]

Just get one of these and never wonder again:
http://www.threadtoolsupply.com/thread-pitch-gauge.html

 

[1stmar]

6 it is. Thx