need some help...anyone ever tap 4mm screw holes?

[redshift]

I should mention, always use at least a medium viscosity oil, (30W motor oil is ok in a pinch) but ideally some tapping fluid.

The conversion is .039" = 1mm, remember that and you'll be able to substitute SAE for metric almost anywhere.

[TexasSP]

Originally Posted by redshift

I should mention, always use at least a medium viscosity oil, (30W motor oil is ok in a pinch) but ideally some tapping fluid.

Most important thing to remember when tapping. Gotta have the fluid, I always use one called tap magic.