An interrupted screw or interrupted thread is a mechanical device typically used in the breech of artillery guns. It was invented circa 1845. It is a screw that has a section of thread along its axis removed. The screw is mated with a hole at the rear of the weapon's chamber; i.e., where the screw has threads the hole does not, and vice versa. The screw can thus be smoothly inserted all the way into the gun, after which as little as of a turn can engage the two sets of threads securely, sealing the breech. Interrupted screws are occasionally seen in loose gunpowder rifles, as this mechanism was historically one of the few practical ways to achieve a gas-proof seal with a breech-loading firearm that does not employ cartridges. An earlier method was the use of a wedge to block the rear of th
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