Use as thick a cotter key as possible and cut off the surplus end. Roll pins should be installed using a round punch and hammer. Safety wire inserts through capscrew heads or drilled nuts. When properly installed and tightened they provide tension that is opposite to the loosening rotation of the fastener. Locking plates have tabs that are bent up onto a nut or bolt face thus holding the fastener in position.
Setscrews usually lock the item to a flat spot ground onto the threaded shaft.
Take note of the proper locking device for the application when disassembling a project. Parts manuals are quite handy when reinstalling components according to specs as they, often times, include all fasteners and locking devices in the schematics. As mentioned earlier the manufacturers have gone through great expense to ensure the correct fastener for their component. Make use of their recommendations and requirements to get the proper life and safety out of your piece of equipment. This website is supported by voluntary subscribers.