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Surface Finish, Old Symbol

Surface Finish, Old Symbol

Surface Finish, Old Symbol

(OP)
We have a 1940's vintage drawing of a special bolt that calls for a surface finish with an old symbol; it looks like an integral sign and has a number after it - our symbol is f 4.  I have a 1939 Machinery's Handbook that says f 1 is rough machined, f 2 is ordinary machining, up through f 5 for polished.  f 4 is a ground surface, which makes sense for this bolt.  Our client has another undocumented reference that has the numbers in reverse order, f 5 is rough and f 1 is polished.  Can anyone shed some light on this finish symbol?

RE: Surface Finish, Old Symbol

I checked all my old stuff including a asme reference and f4 is a ground surface corresponding to the common 32 finish of today.

Woody Ebersold
Consulting Engineer
"AN EXPERT IS ALWAYS SOMEONE FROM OUT OF TOWN"

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