2.1/2″ – 4 UNC Steel Class 8 Black Hex Jam Nut
Jam nuts (also known as lock nuts or half nuts) are thin nuts used to lock another hexagon nut in place by “jamming” up against the other, when tightened.
- Used to lock against a standard nut
- Low profile nut for situations where a standard nut will not fit
- Hexagonal for use with spanners and sockets
- Black finish suitable for internal applications