Castle Nut M42 x 4.5 Black High Type Gr.8 DIN 935

Castle Nut
Hexagon High Type
Metric
Black / Self Color
High Tensile Grade 8
Dia: M42
Pitch: 4.5
DIN: 935
Wrench Size Across Flats: 65mm
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.