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Slotted Hex Nuts are hex nuts with slots protruding from the top, similar to castle nuts. To use a slotted nut, a hole is drilled through the threaded portion of a bolt or stud. A cotter pin is then placed through the slots and hole and deformed so it cannot easily be removed. This creates a locking effect that prevents the nut from spinning free of the bolt or stud.
Slotted nuts are similar to castle nuts but usually have a lower profile than a castle nut of the same size. Slotted hex nuts are generally preferred to castle nuts due to their lower profile. The cotter pin locks the slotted nut into place, which eliminates the need for other locking-type fasteners. This means no lock washers are needed when using a slotted nut.
Slotted nuts are used in applications where vibration or torque might unfasten the assembly. They are a kind of locknut that can be used interchangeably with castle nuts in most applications.
Functionally, both slotted and castle nuts work much the same and can be used interchangeably in most applications. The difference comes in the slot style. Castle nuts have turret geometry, which allows cotter pins fastened through the slots to be bent closer to the nut, allowing for a less protruding pin.
The slots in castle and slotted nuts are for accepting a cotter, split, or taper pin or wire to prevent the nut from loosening. The pin, threaded through a hole at the end of a bolt and a slot in the nut, is bent around the castle or slotted nut to lock it down.
Traditionally, slotted nuts are locked with cotter pins or split pins. R-Clips and safety wire have also been known to be used for installing castle nuts.
Lock nuts are an easy to use, cost-effective solution to protecting against vibration-related loosening. They're used to protect applications from loosening over time.
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