Warning

 

Close
Confirm Action

Are you sure you wish to do this?

Cancel Confirm
AR15.COM
AR Sponsor
5/9/2010 2:14:51 PM EDT
Is it a 8-40 thread?     I know it is not a 8-32 or 10- 32.
Thanks
5/9/2010 2:50:30 PM EDT
[#1]
I just happened to have one right in front of me.

With my pitch gauge, I came up with 36 TPI. That is for sure.

And eyeballing it up with a standard machine screw, and measuring the major diameter of the threads with my dial calipers (.159") it appears to be the same size as a number 8.

So my educated guess would be 8x36.
5/9/2010 2:55:06 PM EDT
[#2]
Thanks.
AR Sponsor