M4 Thread Question

[NeilW]

Hi,

I don't have a screw pitch gauge. Can anyone tell me whether the M4 screws that commonly attach dovetail plates to focusers are 0.7 coarse or 0.5 fine pitch?

Thanks,

[Stefan Buda]

Neil,

Normal or coarse M4 has .7mm pitch and I have never came across a fine pitch M4 in all my engineering years.

cheers,
Stefan

[NeilW]

Thanks Stefan. I found this when I was looking up information...

http://www.fullermetric.com/technica...ead_chart.aspx

Just confused me a bit.

Cheers,

[mswhin63 (Malcolm)]

I have a bunch of M4's. They appear to be 0.7.

M3's are usually 0.5