螺栓：通常与螺母一起用于连接两个或更多零件的机械紧固件。
Bolt: Mechanical fastener, usually used with a nut, for connecting two or more parts.
矫直工在交接班时先检查机械紧固件和液压传动系统，操作手柄及按钮能否正常。
The straightening machine checks the mechanical fasteners and the hydraulic transmission system during the shift, the operation handle and button can be normal.
表面热处理：是增加强紧固件的硬度或任何表面积上的机械性能。
Surface heat treatment: surface heat treatment is a process that improves the hard-ness or other mechanical property of the fastener in any surface area.
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