Washers that use a positive locking action when compressed in order to secure bolts or nuts to prevent them from loosening when exposed to vibrations.
Washers that have a high thickness and a smaller outer diameter that allow for use in tight spaces. Generally for use with socket head cap screws.
Washers built with ridges that secure bolts with tension instead of friction. For severe vibration applications.
Unsorted products needing to be put into proper categories.