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is this for corrosion resistance?
Probably. I doubt that the parts will be ground - turned from bar stock with flats milled on the sides, maybe? The surface finish requirement is probably to make sure they get hand sanded after machining so they look nice.
I reckon +/- 0.05” (0.13mm) on the length is probably about right for parting off on a manual lathe with no second-op machining.
hiraethus
fizzy.bleach
i've been thinking way too much about this drawing.
can someone who knows more about engineering/machining tell me why it specs a pretty loose tolerance (+/- .005") but a fairly high surface finish? the former will be because it's for a non-precise application:
but why the latter? according to some googling, a surface finish of 16 is a medium-ground finish. is this for corrosion resistance?