Bulk USS Flat Washers – Medium Carbon Thru-Hardened, Zinc CR+3, Made in USA – Monster Bolts Size:400 Qty - 3/4" Forged from hardened 410 stainless

Forged from hardened 410 stainless steel (martensitic

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

leaves the concrete surface flat

making them ideal for demanding applications

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

Bulk USS Flat Washers – Medium Carbon Thru-Hardened, Zinc CR+3, Made in USA – Monster Bolts Size:400 Qty - 3/4" Forged from hardened 410 stainlessMonster 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