Heritage 150p clamp thumbscrew size?

[Stu]

I’ve managed to lose the thumbscrew which locks the dovetail in place on the Heritage 150p so need to source a replacement.

Does anyone know what thread size/pitch it is, or a good place to source a replacement?

Thanks!

Stu

[wulfrun]

I'm intrigued, it looks like M8 x 1.25 but apparently not. At any rate, an M8 x 1.25 tap won't go in and the corresponding die won't thread on the screw. Sorry that's not more helpful! I'm guessing it's an imperial size?

EDIT: Calipers say 7.84mm/0.309" across the threads, which is very close to 5/16" (0.3125").

Edited July 28, 2021 by wulfrun