Interrupted screw

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Breech from Russian 122 mm M1910 howitzer, modified and combined with 105mm H37 howitzer barrel

Breech from Russian 122 mm M1910 howitzer, modified and combined with 105mm H37 howitzer barrel

Illustration of an M109 breech plug

An interrupted screw or interrupted thread is a mechanical device typically used in the breech of artillery guns. It is a screw that has a section of thread along its axis removed. This removal, coupled with an appropriate hole, allows the screw to be inserted directly and tightened in only 1/4 or 1/6 of a turn. It is sometimes used in loose gunpowder rifles, as it is one of the few practical ways to achieve a gas-proof seal with a gun that uses loose-loaded propellant.

[edit] External links

• Interrupted screw breech mechanisms
• Navweaps.com Interrupted threads used on naval guns

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