短语词组短语locking crank fastener 闭锁紧固件self locking fastener 自锁紧固件Self -locking prevailing torque fastener 发明名称spring stop -nut locking fastener [机]弹簧防松螺母锁紧件Wind turbine fastener -locking stud nut 锚固螺母 返回 locking fastener