This 6 slot trailer spindle castle nut measures 1″ in sized to fit standard 1 inch spindles on a wide range of trailer axles. This 6 slot style of castle nut is used on standard axles that use a cotter key to secure the castle nut in place. Features: 6 Slot Trailer Castle Nut for 1 inch Spindle 1-inch by 14 thread 6 Slots paths for cotter key insertion
