Castle Nut 9/16 x 18 UNF Black High Type Gr.8

Castle Nut
Hexagon High Type
Imperial UNF
Black / Self Color
High Tensile Grade 8
Dia: 9/16'
TPI: 18
DIN: 935
Wrench Size Across Flats: 7/8'
A DIN 935 castle nut (or castellated nut) is a specialized hex nut featuring a notched, cylindrical top that resembles a medieval castle's battlements. It is designed to create a "positive locking" connection that is virtually impossible to loosen accidentally. An split pin is normally used with the nut.