No they are not metric BUT....... the major diameter (od over the
matches very closely to
.0625" + (screw size # ) multiplied by .0125"
check it out it helps me remember screw OD's
gets close enough
yes....just plug in the screw size number & you'll get the OD of the
screw within a few thousandths of an inch.
so for a number 6 machine screw 6 * 1/80 + 1/16 = .1375"
# 6 screw OD is ~ .136" so the formula works close enough for me &
it's easier to remember than all the screw sizes 1 thru 10
Ha! you think you can resist the logic & usefulness of the good ol' metric
Even England seems to be able to see the sense - well, sort of - (except on
the road, a bit like they're a sort of a member of the EU).
BTW, Australia went metric in 1973, but you can still buy imperial screw
sizes, in fact in woodworking & marine for example still use those wacky
Does anyone know "the history" of how these numbers came about?
For example, shotgun gauges are based on a pound of pure lead divide
into equal sized spheres...
what are screw sizes and wire and metal gauges based on?
glenn P wrote:
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