A type of hardware fastener with a threaded hole.

Nut threaded onto a bolt along with a plain washer.

Across Corners (AC)

The distance on a nut from one corner to the opposite corner. The purpose of the AC dimension is to know how large a hole might be needed to insert a recessed nut.

Across Flats (AF)

The distance on a nut from one flat surface to the opposite flat surface. This is the size of the wrench needed to install or remove the nut.

Bihexagon Nut

A bolt or screw whose cross section of its head is in the shape of a 12 pointed star.

Cap Nut

A nut that is closed at the threaded end often with a dome.

Captive Nut

A nut which fits into a cage and is welded in place. This is done where the nut is not easily accessible.

Cleveloc Nut

The collar of the nut is elliptical in cross section and it is this that provides the flexible locking element. The nut is pre-lubricated to reduce the tightening torque. Cleveloc is a registered trade name of Forest Fasteners.

Flange Nut

A nut with a built in washer to spread the load.

Hexagonal Nut

A nut with a plain internal thread and hexagonal in shape.

Lock Nut

This can be either a second nut that is tightened against the first nut or a nut that has some form of system that prevents the nut from coming loose with vibration, eg Cleveloc or Nyloc.

Sometimes called a Jam Nut.

Nyloc Nut

A nut with an elastic ring that grips the bolt and stops he tendancy for the nut to vibrate loose.

Square Nut

As per the title, a plain thread square nut.

Wing Nut

A nut with wings that allow it to be tightened and released using fingers.

See also: Bolt, Breakaway Torque, Hot Bolting, Internal Thread, Snug Torque, Thread, Washer.

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Subjects: Fixings and Fasteners