when they get longer the increment changes to 1/4", then 1/2". Don't look
for those.

The length of the unthreaded shoulder just undre the head is designed
according to an ancient recipe of a max of 1/3 third the shank length or a
minimum of n inches or whatever. Don't look. Sometimes it is better to buy
a shorter screw with more thread. Don't ask. and definelty don't ask about
washers.

The radius on the underside of the head of machine screws is controlled to a
very high tolerance also. In metal to metal contact m/c screws should have
calculations made such that enough threads are engaged so that the tensile
strength breakage point is converely supplemenatry.

The coefficient of friction, µ, of a titanium and carbon or low allow steel,
but not corrosion resistant steel between a nut and a bolt is .08 (+/-20%)



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