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Thinking of threads - especially for rifles (I'm not a pistol guy).
Seems 1/4-28 is the standard for #11 rifles. OAL and thread length vary with pistols and slightly with rifles that have drums.
I've made a few M6-1.0, but very few.
5/16-18 with a musket cap is common on percussion military style rifles (including original Parker Hale's).
Here is the one that confuses many. 5/16-20; when PH sold off and things started to be made in Italy - it's actually a M8x1.25, even todays Euroarms as well as Navy Arms and Pedersoli.
8mm = 0.315" vs 5/16 = 0.3125" (0.0025", 1/2 the thickness of a hair on your head..) M8 is larger.
1.25 is 20.32 tpi. vs 20. This is Treads per Inch. Since the threads are roughly 1/4 inch long = 5.08 threads. vs 5.
They are virtually interchangeable theoretically, throw in tolerances and they are.
Like IDlewis, 24tpi is seldom seen.
I've made some 1/4-30, 1/4-32 and 12-28 for originals over the years..
Seems 1/4-28 is the standard for #11 rifles. OAL and thread length vary with pistols and slightly with rifles that have drums.
I've made a few M6-1.0, but very few.
5/16-18 with a musket cap is common on percussion military style rifles (including original Parker Hale's).
Here is the one that confuses many. 5/16-20; when PH sold off and things started to be made in Italy - it's actually a M8x1.25, even todays Euroarms as well as Navy Arms and Pedersoli.
8mm = 0.315" vs 5/16 = 0.3125" (0.0025", 1/2 the thickness of a hair on your head..) M8 is larger.
1.25 is 20.32 tpi. vs 20. This is Treads per Inch. Since the threads are roughly 1/4 inch long = 5.08 threads. vs 5.
They are virtually interchangeable theoretically, throw in tolerances and they are.
Like IDlewis, 24tpi is seldom seen.
I've made some 1/4-30, 1/4-32 and 12-28 for originals over the years..