[Shop-talk] What the heck screw do I need? And where do I get one?

[Trevor Boicey]

My 1930s house used 5/16" x 28tpi.

Even among local antique store junk drawers that isn't common.

I was able to find 5/16" bolts with 28tpi threads that screwed perfectly
into the holes, but somebody with more free time than I have would need to
cut the bolt into set-screws and machine a screwdriver slot into them.

So.... good luck with that. My problem remains unsolved waiting for another
day.


On Fri, Mar 3, 2017 at 7:35 PM, David Scheidt <dmscheidt at gmail.com> wrote:

> I have a number of door knobs that need set screws to hold them to
> their spindles.  (Square threaded spindles in mortise locksets.)  The
> normal size of these is 1/4-20 or rarely 5/16-24 or even more rarely
> 1/4-28.  The existing screws are 28 tpi, with a major diameter of
> 0.280.  That's no screw thread I know of, but I have a house full of
> them (identical glass door knobs, presumably original to the house,
> circa 1925.) so it must be something.
>
>
> --
> David Scheidt
> dmscheidt at gmail.com
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