McMaster 95462A033 Medium-Strength Steel Hex Nut Grade 5, Zinc-Plated, 1/2"-13 Thread Size PK100

The most commonly used hex nuts, these are suitable for fastening most machinery and equipment.

Medium-Strength Steel—These Grade 5 or Class 8 nuts are your go-to for fastening most machinery and equipment. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.