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美国马歇尔宇宙飞行中心使用了一种新型的具有锁紧作用的螺栓螺母紧固件,在螺栓的外表面上切有三条纵向槽,而在螺母的内表面上切有四条纵向槽,在安装时螺母拧紧到预定的扭矩后再拧到使它的某一条槽能与最邻近的螺栓某一条槽对准,然后把键插入对准的槽中,再把它的一端弯到螺母的环形空间,这样它们就锁紧在一起了,不管是在高温、在有振动的场合或在高速回转的机械上锁紧作用都很可靠,
Marshall Space Flight Center of the United States used a new type of bolt and nut fastener with locking effect, with three longitudinal grooves cut into the outer surface of the bolt and four longitudinal grooves cut into the inner surface of the nut. During installation Tighten the nut to a predetermined torque and then screw so that one of its grooves can be aligned with a groove of the nearest bolt and then insert the key into the aligned groove and then bend one end of the nut to the annular space of the nut, So that they are locked together, whether at high temperatures, in the case of vibration or high-speed rotation of the mechanical locking effect is very reliable,