MG42的枪机包括一个枪机头（bolt head）、一对滚轴（two rollers），一个击槌套（striker sleeve）、枪机槽（bolt body），以及一个粗大的复进簧（large return spring）。
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stay bolt body 撑螺体
body of bolt 螺栓杆 ; 螺栓体
bolt thread body 螺栓螺纹体
ground body bolt 接地体螺栓
body shear bolt bracket 车身保险螺栓架
dump body pin retainer bolt 翻斗车销固定螺栓
Safety bolt is set on the valve body, when the pressure in the cylinder is too high, safety diaphragm will burst automatically to ensure the safety accident cases, for the safety of the bottle.
瓶阀体上设安全螺栓，当气瓶内压力过高时，安全膜片将自动爆破泄压以确保意外情况下瓶的安全。
Anchor/support bolt holes are located in base of body.
固定器/支架螺栓孔位于阀门的基座。
A bolt consists of a head and a cylindrical body with screw threads along a portion of its length.
螺栓是一个带头部并在部分长度上有螺纹的圆柱体。
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