What are some points to remember while installing push nuts and retainers?

The threaded fastener should have appropriate diameter tolerance. Shafts having tight shaft diameter tolerance are supplied with the required holding force by the push nut.The rod should have adequate hardness (without exceeding a fixed value) to allow the locking teeth to dig in.The shaft cutoffs should be rounded or chamfered for quick installation of the push retainer.

What are the differences between push-on retainers and washers?

Washers are ideal for distributing the load from a fastener whereas push-on retainers are suitable for preventing fasteners from loosening or slipping in assemblies.Generally, washers are shaped flat. Push-on retainers are not necessarily flat and may have teeth or grooves on one of their sides to resist the motion of a fastener.