Surface finish interpretation

[banshee1]

Looking for clarification on the surface finish symbol on this print. I know the purpose of the line at the top of the symbol, but I've never seen it extend to the left. It doesn't look accidental so maybe it has a purpose I'm not aware of?

Thanks. BTW print was originally done in '59.

 

[CheckerHater]

Usually it has (had) a purpose when some parameters are indicated above or below it:


"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future

 

[dgallup]

Looks like something tRump did with a sharpie. It's malformed by any standard I've ever seen.

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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.

 

[Bill B.]

Just a side note: The thread call out is for a UNF thread however the spec (MIL-S-8879 currently AS8879)and the minor diameter listed is for a UNJ thread form.