Once tightened, a cotter pin (or split pin) is inserted through the nut's slots and the bolt's hole.
Hexagon Slotted Castle Nuts (also called crown nuts). iso 7035 pdf
Typically available in Product Grades A and B. Design and Locking Mechanism Once tightened, a cotter pin (or split pin)
Department of Integrative Biology, Oregon State University, OR 97331, USA