Reply To: Record 044 iron depth adjustment screw threads

#725824
Larry Geib
Participant

The threads were originally 3/16 Whitworth, with 24 TPI. I think at some point record transitioned to Imperial, so it depends on which age yours is, but in that size it doesn’t make a difference.

Nearly identical is imperial or Unified national thread 10-24, that is, #10 (.190”) 24 threads per inch. You won’t notice the difference.
(3/16” = ..1875”)
It’s a very common size at places that stock UNC or imperial. Thumbscrews of that size are in every hardware store in America.

It’s generally the size for several bolts on Stanley and other record planes, for instance the depth stop and blade screw on a Stanley 78.

3/16 “ =4.8 mm so using an M5 tap might work to reshape the hole threads to metric. It might work for a hole that isn’t too deep. 24 TPI is about 1.058 mm pitch, so you can go several turns before it matters.
If that fails, go to M6.

Don’t bother looking for 3/16” -24 imperial threads. They aren’t made.

Threads are coarse ( rough, as you say) because cast iron doesn’t hold fine threads well.

  • This reply was modified 1 year, 3 months ago by Larry Geib.
  • This reply was modified 1 year, 3 months ago by Larry Geib.