4LO switchgear, internal screw thread sizes

[malc888]

Hi - I'm approaching the end of a rather lengthy (15 years ) rebuild of my 350 had a couple of screws shear off in both switchgear assemblies. I assumed that these were JIS headed standard metric threads but these appear to be too fine. Does anyone know what the spec of these screws are? Is there such a thing as coarse thread on M2, M3 etc?

Thanks - Malcolm

[LC_BOTT]

Think they are just a standard M5 thread, and yes are JIS screws as standard.

[malc888]

Jul 19, 2023 13:30:26 GMT 1 LC_BOTT said:

Think they are just a standard M5 thread, and yes are JIS screws as standard.

Thanks - I think the external screws holding the two halves together are M5, but the internal screws are M3 at most. Just not a standard M3 thread apparently

[4l04ever]

Some of the internal screws are self tappers...

[malc888]

Thanks - that would make sense