On Fri, 19 Jun 2020 18:49:16 +0200, Robert Roland wrote:

On Thu, 18 Jun 2020 11:09:30 +0000 (UTC), maxq wrote:

I'm making a special tool out of a 3/8 drive socket. It'll have to be
turned by a wrench or gripped by vise jaws. I'll file flats on the
square end.

Should the flats be parallel with the square's sides, or have the point
in the middle? This is a high-torque situation.

I have no scientific answer or explanation, but my gut feeling suggests
parallel.

BTW: Those sockets are really hard. Filing might be near impossible. In
a similar application, I used an angle grinder.


It's soft now, drilled it already to clear the bolt shank. It'll be hard
again later.