BelMetric Castle Nuts are available in full height (DIN 935) and low profile (DIN 937) styles, also known as castellated nut or slotted nut because of the slots or "notches" cut into one side.
Castle nuts secure to a fastener using a cotter (split) pin, which protects against loosening from vibration.
Commonly used in low-torque applications - industries include automotive, aircraft and locomotive.
