Comment by LeifCarrotson
17 hours ago
It's 0.0015, that's 1.5 to 2.5 thousandths, or 15-25 "tenths" as they're called.
That's not a particularly tiny gap in the machinist world, it's large so that you can pump viscous oil in it and deal with a wide variety of temperature changes.
25 thousandths would be sloppy, a nominal clearance hole for a 1/4x20 bolt is about that much.
Good catch, sorry should have corrected that. While not small for a machinist, I think by the average persons definition that is a pretty small gap for the oil to occupy ;-)
> 25 thousandths would be sloppy, a nominal clearance hole for a 1/4x20 bolt is about that much.
Isn't that 0.250 which would be 250 thousandths?
No, they're talking about the clearance, which is the difference between the diameter of the bolt itself (1/4") and the diameter of a hole in which the bolt loosely fits (a couple hundredths of an inch bigger than that).