A six-sided internally threaded fastener with metric thread pitch. 16 millimeter nuts and smaller are chamfered on the top and the bearing surface. Larger nuts may be double chamfered, or have a washer face on one side and a chamfered surface on the opposite side. Generally manufactured in accordance with DIN Standard 934 or ISO Standard 4032.

A six-sided internally threaded fastener whose thickness is .875 times the nominal nut size and whose width across the flats is 1.5 times.

The most commonly used general purpose nut.

A six-sided, double chamfered nut that is available in various widths and lengths.

A heavy hex nut made of alloy steel, manufactured in accordance with ASTM Standard A194 Grade 2H.

Used for high-temperature and high-pressure conditions.

A six-sided internally threaded fastener which is thinner than the thickness of a finished hex nut.

Used in combination with a finished hex nut to keep the nut from loosening.

A six-sided nut with a nylon-filled collar at its back end and metric thread pitch. When a bolt or screw reaches the collar, the threads and nylon form a tight, frictional fit, restricting movement of the fastener when it is subjected to vibration. Generally manufactured in accordance with DIN Standard 985.

A four-sided, internally threaded fastener with a flat bottom side and a chamfered, washer-crowned top.

Designed for use with square bolts.

Has wings which allow the nut to be manually turned.

Used when a part is frequently assembled and disassembled by hand.

Looks like a hex nut with an acorn-shaped top.

Used to cover exposed, dangerous bolt threads or to add a finished appearance