GG’s:

I’ve posted this before.  

There is, or was, a standard for straight screw slots which was based on wire
gauges.  If anyone can come up with a reference on this, I would greatly
appreciate it.

The intended scope of the standard is unclear; wood screws, machine screws, or
both. British or US?

Likewise, I can’t recall which of the several wire gauges was referenced.

Scott Grandstaff has it right; the only dimensions which are important are the
slots of the screws you are driving, which may or may not conform to some
standard.

That said, I’d like to grind a set of drivers for the US standard, if there is
one.

John Ruth
In Metuchen, NJ, where it is beginning to snow.

Sent from my iPhone