Christian.H
Active Member
Is it possible to re-thread a 1x15 to 5/8 unf?
well spottedUNF is 18 tpi,
The basic minor dimension of your 5/8UNF thread is 14.1mm. You are looking for 14.9mm OD of material for an M15X1 thread. Therefore a standard re-thead can't be done. If the ~15mm of barrel length is that important to you I would make a collar with 1/2UNF internal thread. Set-up the gun true to bore in lathe. Turn down the 5/8UNF and rethread 1/2UNF. Apply thread locker and screw collar to end of barrel, tightening with a strap. Turn down the collar to 14.9mm and cut a 1mm pitch on it. Re-crown and check concentricity between mod and gun. A bit more aggrevation than normal, but no need for a new mod.
Has anyone used metal spraying to build the diameter before rethreading?