Some methods use impact to retract the locking bolt, most of which are destructive.

个别方法利用冲击力来使锁闸缩回，但大多数都会令材料解体。

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The locking bolt is provided with an outer thread mating with the expansion pipe at the peripheral surface and has a groove at one end.

一锁定螺栓，其周面上具有与膨胀管相匹配的外螺纹，并在其一端设有凹槽。

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By using the finite element method, the dynamic stress caused by vertical contact impact between bolt locking surface and barrel extension locking surface of a new rifle was studied.

采用有限元方法研究了某新型自动步枪枪机闭锁面与节套闭锁面间垂直接触碰撞的动应力。

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