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Dave Is correct it is a 1/4 x 32; see the photo. If you enlarge the lower side of the screw head, you will see it is chamferred for about 1/32 inch at what appears to be the V of the thread. This particular screw head does not bottom on its flat but on its edge. This is the only hinge pin I have that removes easily so I cannot comment about this being the same in all guns.
An important observation on this gun is that the frame and roll are continuously threaded.
Best, Austin
The Following 4 Users Say Thank You to Austin W Hogan For Your Post:
Screw Size
Threaded Mode