Typically used as a locking nut, where it is ‘jammed’ up against a standard nut, locking the two in place. Also used when clearance is an issue, where
3/4-16 UNF HEX JAM NUT GR2 ZN 309.34
3/4-16 UNF HEX JAM NUT GR2 ZN 309.34
3/4-16 UNF HEX JAM NUT GR2 ZN 309.34
3/4-16 UNF HEX JAM NUT GR2 ZN 309.34