How does a lock washer work?
A lock washer works by adding tension to a fastener assembly. In some cases with little teeth and in others with a spring-like coil shape. These washers create pressure on either the nut or bolt (depending on where you use it) to prevent accidental loosening via vibration.
Which side does a lock washer go on?
For the same reason, lock washers always go on the nut side to stop the nut moving. Lock washers are almost always used with a flat washer as well. The nut is also often smaller in profile than the bolt head. Not always, but often.
How do you use a lock washer and flat washer together?
Ideally the lock washer goes into the threaded fastener first followed by the flat washer. This way the lock washer adds tension to the fastener assembly. It creates pressure on the bolt or nut (depending on where it is used) to prevent the assembly from loosening when it is exposed to vibration.
How do you use a lock washer with a bolt?
Place the lock washer between the nut and the work surface if using a nut-and-bolt configuration, or between the fastener head and the work surface if using a tapped hole configuration. In other words, the bolt goes straight into the hole and doesn’t poke out the other end, so no nut is used.