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Old 08-18-2019, 06:45pm   #22
JRD77VET
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Quote:
Originally Posted by DAB View Post
a whut????

never heard of such a thing. what's that in inches? something like 5/8"?
That's why the US standardized threads in 1920. The #30 thread is .300 in diameter.

There was no rhyme or reason to manufacturer thread sizing so you were forced to purchase replacement parts only from them. Now if you want to produce an oddball thread size, you specify diameter and thread pitch.
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