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Translating old class-of-fit designations to new?

John Garner

Titanium
Joined
Sep 1, 2004
Location
south SF Bay area, California
Good afternoon, all --

Do any of you know of a "generally recognized" way of translating old-style class-of-fit designations to current-style designations? I'm particularly interested in translating "thumb press fit" as applied to a 3/8 inch diameter pin, but it would be handy to have translations for the whole range from "loose running" down to "heavy press".

Thanks in advance.

John
 
I think I have a chart somewhere that mentions those old classes and what the tolerances would be per inch...I'll take a gander tomorrow and see if I can dig it up.
 








 
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