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

[Steven Trovato]

Does 5/16-28 solve the problem?  It looks like 
they exist, even if they are not common.  I found this:
http://www.thomasnet.com/catalogs/item/30331745-15908-1089-5063/jim-c-howe-fastener-supply-inc/5_16-28-inch-in-thread-size-alloy-steel-socket-head-half-dog-point-set-screw/

-Steve

At 02:47 PM 3/4/2017, Trevor Boicey wrote:
>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 
><<mailto:dmscheidt at gmail.com>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.
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