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bop
January 24, 2012, 11:42 AM
OK, I've got a good one for the gunsmiths out there. I have a .38 S%W Iver Johnson Break-Top that is in need of a firing pin "bushing". Have new (?) bushing but it looks like the threads in the reciever are a bit burred. My question: Whats the thread count & pitch on these little devils? It looks like the thread count is 44 but I'm having a hard time verifying that. All help is greatly appreciated!!

Fleet
January 24, 2012, 07:39 PM
Get a thread pitch gauge, then there's no guessing.
http://www.brownells.com/.aspx/pid=7666/Product/STRAIGHT-THREAD-PITCH-GAUGE

smoakingun
January 24, 2012, 07:39 PM
the best/easiest way to determine the pitch is with a pitch guage.

bop
January 25, 2012, 10:30 PM
Thanks guys. I have both Standard & Metric thread gauges but I couldn't verify the count. I'll try a 9/32-44 tap & see what arises. Thanks again.

smoakingun
January 26, 2012, 10:45 PM
be careful with that tap. In the world of firearms, they use some non standard threads. check with someplace like brownells to see if they carry an industry specific pitch guage