Half Inch Thick Flat Washer 25 Pack Heavy Duty USS Style Outer Diameter One And Three Eighths Inches Inner Diameter Nine Sixteenths Inches Thickness 0.086 To 0.132 Inches Hot Dip Galvanized Steel Pro Grade Built Tough Meets ASME B18.21.1

Heavy duty 1/2 in USS flat washer, 25 count galvanized
✔️ 1/2 in thick USS washer; OD 1-3/8, ID 9/16, thk 0.086-0.132 in

This heavy duty flat washer is designed to distribute load and protect surfaces across structural, automotive, and outdoor hardware projects. The USS style is the common standard and is thicker than SAE washers for added strength and durability.

✅ Size: 1/2" (12.7 mm)
✅ Outside Diameter: 1-3/8" (34.93 mm)
✅ Inside Diameter: 9/16" (14.29 mm)
✅ Thickness: 0.086-0.132" (2.18-3.35 mm)
✅ Type: USS flat washer
✅ Material & Plating: low carbon steel, hot-dip galvanized
✅ Packaging: 25 washers per package
✅ Standards: ASME B18.21.1

💡 What is a flat washer used for in standard mechanical assemblies?

Flat washers spread load and protect surfaces; handy for outdoor or damp setups.

- Load distribution to prevent surface indentation

- Protects mating surfaces from bolt head damage

- Galvanized finish offers outdoor corrosion resistance