Nominal Size: 5/16"
Thread: 24 TPI (Fine)
Width Across Flats: 1/2"
Height: 3/16"
Across-Corners Size: 9/16"
Material: Stainless Steel
Shape: Jam Nut
Hardness: 18-8
Type: Jam Nut
Box of 12.
A jam nut is a low profile type of nut, typically half as tall as a standard nut. It is commonly used as a type of locknut, where it is "jammed" up against a standard nut to lock the two in place. It is also used in situations where a standard nut would not fit.