Jam nuts are thinner than standard nuts and thread against a primary nut to lock it in place and prevent loosening.
Nominal Size: 3/8"
Thread: 24 TPI (Fine)
Width Across Flats: 9/16"
Height: 7/32"
Across-Corners Size: 5/8"
Material: Steel
Finish: Zinc
Shape: Jam Nut
Type: Jam Nut
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.