Positive locking device
Encyclopedia
A positive locking device is a device used in conjunction with a fastener in order to positively lock the fastener. This means that the fastener can not work loose from vibration
Vibration
Vibration refers to mechanical oscillations about an equilibrium point. The oscillations may be periodic such as the motion of a pendulum or random such as the movement of a tire on a gravel road.Vibration is occasionally "desirable"...

s. The following is a list of positive locking devices:
  • A split beam nut
    Split beam nut
    A split beam nut, also known as a split hex nut or slotted beam nut, is a locknut with slots cut in the top that separate the outside end into two or more sections that are bent slightly inward, making the thread diameter undersized in the slotted portion...

     and a split pin
  • A castellated nut
    Castellated nut
    A castellated nut, also called a castle nut or slotted nut, is a nut with slots cut into one end. The name comes from the nut’s resemblance to the crenellated parapet of a medieval castle....

     and a split pin
  • A hex nut or cap screw and a tab washer
  • A hex nut or cap screw and a lock plate
  • Safety wiring with various types of fasteners
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