Bulk USS Flat Washers – Medium Carbon Thru-Hardened, Zinc CR+3, Made in USA – Monster Bolts Size:400 Qty - 3/4" access panels

access panels

The classic slotted drive ensures compatibility with flat-blade drivers and legacy equipment

The set comes in a compact ABS storage case with clear size markings for easy identification

✔️ Plain finish for versatile application

hydrogen-relief baked to IFI spec

Bulk USS Flat Washers – Medium Carbon Thru-Hardened, Zinc CR+3, Made in USA – Monster Bolts Size:400 Qty - 3/4" access panelsMonster Overview Fix your project right the first time with USS Flat Washers Medium Carbon Thru Hardened, Zinc CR+3 from Monster Bolts. These USA made USS pattern washers feature a larger outside diameter than SAE washers, making them ideal for construction, structural applications, machinery, fabrication, and repair work. Made from thru hardened medium carbon steel, these washers provide a durable bearing surface under bolt heads and nuts to help