Riccardo

Hy guys,
my request is not strictly related to VTR, but you are the only ones I know that can help me with UNF and withworth screw thread.
I have some aircraft bolts, screws, and nuts (NAS 1303, NAS 333 for example) and I need to buy taps and die for them. I suppose that the screw thread should be a UNF 10-32, but I have a little dubt that it could be a 3/16-32 BSF Withworth Fine.
Can someone confirm the 10-32 thread?
Is there a trick to easily distinguish those similar thread? The nut diameter difference is so slight that I find it not significative.
Thanks in advance
Bye.


PS. millimeters rulez, inches sucks!!!!

drew_c14

Really close to the same thing. 0.18 and 0.19. Where did you get the bolts? Finding out what they were made for might help a lot.

drew_c14

Update: NAS 1303 is 10-32, http://www.coastfab.com/boltsseries.html

Riccardo

OK, but there is also another difference: the angle of thread coil is 55° for withworth and 60° for UNF.

They came from Alitalia mainteinance service.
They were used on MD80 aircraft.

Thanks. That's what I was looking for!!!!