[pontiacpetey]

Originally Posted by ponchjoe

How do you know it’s 10/28? Could it be metric, it could be an aerospace application. MS, AS, NAS, hardware may fit the bill if you are absolutely sure that is the true size.

Edit:
I now know what you are working on:

https://www.jimbodetools.com/product...er-gauge-72830

Yes I love those old tools and using them too, this is a pretty handy gadget when set up correctly.

I dont think they aerospace stuff 100 years ago lol.

[dmorg1]

Not saying that what you have is not a 10-28 screw.


10-28 is not an American Standard Thread but 12-28 is.
The diameter for a #12 screw will be .216



This is how to determine the Number of a screw when the diameter is known.

#10 example

.190 (Diameter of said screw) minus .060 (Standard) = .130

.130 divided by .013 (Standard) = #10 Screw




The distance from thread crest to thread crest for a 28 TPI thread will be .0357

1 divided by 28 (number of threads) = .0357 (pitch)




If you are unable to locate a replacement the next time we are running a #10 screw job we can sneak something in for you.


Dave


http://www.stellarmachine.com/