Lock nuts are typically used by engineers and mechanics to secure wheels on axles and threaded shafts. A nylon lock nut comes with a nylon insert that conforms to the threads of the screw on which it is placed. This causes the nylon lock nut to grip better against the threads and reduces the chances of the nut loosening due to the vibration of the screw.
- Examine the nylon insert for damage
Check the interior of the nut to ensure that the nylon insert is smooth and undamaged. A damaged insert does not grip as well and should be replaced. Only new nuts should be used, as multiple uses damage the nylon insert.
- Place the lock nut
Slide a washer down the shaft or axle until it reaches bottom. This prevents friction from the wheel from loosening the nut once it is in place. Start screwing the lock nut onto the threaded screw or shaft. Screw the nut in place by hand, turning it clockwise until the top of the screw is level with the top of the lock nut.
- Tighten the lock nut
Fit a socket wrench over the top of the nylon lock nut. Turn the wrench in a circular motion clockwise, working the nut down the threads until it reaches bottom. The nut requires twice the force to screw it in place once it is entirely in place on the threads than it did when screwing the nut on by hand. Remove the socket wrench when the nut hits the end of the threads.