Product Description Lock nuts that use a positive locking device can be freely rotated to both tighten and loosen, they only lock when a positive action is performed to lock them in their current position, such as inserting a pin. This can enable both more rapid assembly and more secure fastening. Examples include:

A castellated nut, or castle nut, is a positive locking nut with a cylindrical extension at one end containing notches. These bear against a pin inserted through the threaded shaft, preventing the nut from rotating. A castellated nut may be secured with a cotter pin, an R-clip or safety wire.
A slotted nut is similar to a castellated nut but the notches are cut into the flat face of the nut.

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