scope mount screws
Is there an industry standard thread spec. for the drilled & tapped holes for scope mounts on rifle receivers and barrels ?
If not, what is the thread most commonly factory-installed or later installed by gunsmiths ?
Thanks for the help !
If not, what is the thread most commonly factory-installed or later installed by gunsmiths ?
Thanks for the help !
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Forge, 6x40 is a metric size.
Don't you mean 6-40, 6-48, 8-40 which are ANSI (or SAE NF (national fine) or NS(national special)) threads?
'6' indicating a #6 screw diameter0 -
quote:Originally posted by forgemonkey
Most common,,,,,,,6-48,,,,,,6-40,,,,,8-40,,,,,,there are others but these are the most common that cross my bench,,,,,,,,
Iceracerx ,,,,,,,,ooooops, yes,,,,,,,fingers before brain [:D],,,,thanks. Working with both metric and SAE confuses us ol' curmudgeons ,,,,,,,,,,[:o)]
So a -(dash) indicates ANSI threads, and an "X" indicates metric threads??0 -
quote:Originally posted by toad67 Originally posted by forgemonkey
Most common,,,,,,,6-48,,,,,,6-40,,,,,8-40,,,,,,there are others but these are the most common that cross my bench,,,,,,,,
Iceracerx ,,,,,,,,ooooops, yes,,,,,,,fingers before brain [:D],,,,thanks. Working with both metric and SAE confuses us ol' curmudgeons ,,,,,,,,,,[:o)]
So a -(dash) indicates ANSI threads, and an "X" indicates metric threads??
In metric threads, the number ahead of the X is the basic screw diameter in mm. The number after the X is the physical measured distance from one thread to the next in mm. For example, a screw listed as M6X1.0 would have a diameter of 6mm (approx. .234 in.) and a pitch of 1.0mm (approx. .039 in.) from the top of one thread to the
top of the next thread. This has no correlation to the U.S. Customary system of "threads per inch".0
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