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Rifles, Reloading, Optics, Equipment
Gunsmithing
Muzzle threading vs barrel diameter
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<blockquote data-quote="J E Custom" data-source="post: 1646144" data-attributes="member: 2736"><p>Just an adder to the previous post.</p><p></p><p>I prefer .150 thousandths barrel wall thickness at the minor diameter of the thread for muzzle brakes because of possible distortion of bore and safe pressure containment. less will work, but only with fitted threads and proper installment.</p><p></p><p>Barrel makers will say no less than .137 (That an exact engineering dimension) that will cover all pressures generated by different cartridges.</p><p></p><p>1/2 28 TPI has been used on 30 cal for a long time but even the military has gone to the 5/8 x 24 TPI for safety. Of the muzzle brake failures I have seen, 1/2" x 28 have made up the majority for thread failures. Other failures have been improper installation.</p><p></p><p>Even threads that have a minor diameter larger than .150 more than the bore wall thickness are recommended when possible to lessen the chance of failure and disturbing the bore diameter.</p><p></p><p>There are a lot of things that are done and have not caused problems. but how close have they came to catastrophic failure is something we never find out if we are lucky.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1646144, member: 2736"] Just an adder to the previous post. I prefer .150 thousandths barrel wall thickness at the minor diameter of the thread for muzzle brakes because of possible distortion of bore and safe pressure containment. less will work, but only with fitted threads and proper installment. Barrel makers will say no less than .137 (That an exact engineering dimension) that will cover all pressures generated by different cartridges. 1/2 28 TPI has been used on 30 cal for a long time but even the military has gone to the 5/8 x 24 TPI for safety. Of the muzzle brake failures I have seen, 1/2" x 28 have made up the majority for thread failures. Other failures have been improper installation. Even threads that have a minor diameter larger than .150 more than the bore wall thickness are recommended when possible to lessen the chance of failure and disturbing the bore diameter. There are a lot of things that are done and have not caused problems. but how close have they came to catastrophic failure is something we never find out if we are lucky. J E CUSTOM [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
Muzzle threading vs barrel diameter
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