3/8"-16 x 5/8" 18-8 Stainless Steel Coarse Thread Jam Nuts (12 pcs.)

Diameter: 3/8"
Diameter 2: 5/8"
Thickness: 7/32"
Material: Stainless Steel
Driver Type: 9/16" Wrench
Thread Size: 16 (Coarse)
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.