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释义：扁螺母；安全螺母；保险螺帽；保险螺母 英英释义： Jam nutA jam nut is a low profile type of nut, typically half as tall as a standard nut. It is commonly used as a type of locknut, where it is "jammed"up against a standard nut to lock the two in place.以上来源于:Wikipedia
