[计] 锁紧螺母, 防松螺母
[化] 安全螺母; 防松螺母; 止动螺母

jam nut的用法和样例：

例句

Beneath the handwheel is a hexheaded externally-threaded diaphragm-retaining nut.手轮下面是一个六角形外螺纹横膈膜止动螺母。
The screw is a match for the nut.就像一个螺丝与一个螺母相匹配。
Better stem nut lubrication control.更好的阀杆螺母润滑控制。

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