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

[Dave Cavanaugh]

In the late 19th century and on into the early 20th century a lot of 
this stuff wasn't standardized and manufacturers either made up their 
own threads or used threads no longer readily available. Vintage Stanley 
handplanes are a good example of this.  None of the threads on a Stanley 
plane are of a (currently) standard thread pitch.  Your doorknobs may be 
the same situation and your best bet might be to rethread them to the 
next largest standard size.

Have you tried McMaster Carr?  They sometimes have oddball stuff.

On 3/3/2017 4:35 PM, David Scheidt 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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