Castle Nuts / Slotted Nuts

Product Code DIN935-1

Dinstock are suppliers of a range of slotted nuts including Castle Nuts. 

A castellated nut also called a castle nut or slotted nut, is a nut with slots (notches) cut into one end. The name comes from the nut’s resemblance to the crenelated parapet of a medieval castle.

The bolt or axle has one or two holes drilled through its threaded end. The nut is torqued properly and then if the slot isn’t aligned with the hole in the fastener, the nut is rotated to the nearest slot. The nut is then secured with a cotter pin or safety wire.

Castellated nuts are used in low-torque applications, such as holding a wheel bearing in place.

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What is the difference between castle nuts and slotted nuts?

Both a castle nut and a slotted nut are very similar. They’re often used interchangeably because they’re almost identical in dimensions.

However, they are different in that the protrusions on a slotted nut are from the base of the nut and include the corners, whereas a castle nut looks like a standard nut with triangular portions protruding, but not including the corners of the hex.

When a slotted nut is used in the application, a bolt or threaded bar usually has a pre-drilled hole so that when the slotted nut is threaded on and torqued to the required position, it can be then secured using a cotter pin or write to prevent rotation.

A slotted nut has slots cut into one end of the nut.

Slotted nuts are used in applications where motion or vibration might undo the locknut.

Slotted nuts are usually manufactured as standard from steel grade 4, 8, and 10, and A2 and A4 stainless steel.

A range of sizes, thread styles, and finishes are available.