AmericanLongRifles Forums
General discussion => Gun Building => Topic started by: 44-henry on March 24, 2015, 10:22:08 PM
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Kind of an odd question, but what are your opinions on a 1/2-20 breechplug thread on a pistol barrel? If the caliber was small, say 32, would a well fitted plug be considered safe if 1/2" deep?
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Yes. A 1/2" breech plug would likely work at 1/4" if fitted properly. That would give you 4 or 5 good threads. So, at 1/2" long, you would have9-10 good threads. With a 32 cal. You would still have a good shoulder left to seal the plug.
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Kind of an odd question, but what are your opinions on a 1/2-20 breechplug thread on a pistol barrel? If the caliber was small, say 32, would a well fitted plug be considered safe if 1/2" deep?
I would have no qualms abut a 1/2x20 thread in a 32 caliber pistol.With loads used in those little calibers I wouldn't be afraid of a 7/16x20.Small bore caplock pistols are common in Germany and use about 10 grains of powder so the chance of a blow up is zero.
Bob Roller
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Thanks for the info, didn't figure it would pose any problems with light loads, I'll definitely proof it if I go that route. I did the calculations on shear area compared to a 9/16 -18 thread and it was substantially different.
Regards,
Alex Johnson
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A 1/2"-20 tpi is much bigger than a 1/4"-28 vent liner some of those only have 3-4 threads. Why wouldn't 1/2" work well on a 36 or smaller bore rifle or pistol as a plug ? Just asking, if one of the metal eng. knows yes/no--just like to find out ? ...Tom