Bulk Heavy Hex Nuts – A563 Grade C, Plain Finish, Coarse Thread, Made in USA – Monster B Size:1800 Qty - 5/8"-11 Bulk USS Flat Washers –

Bulk USS Flat Washers – Low Carbon Steel Zinc Yellow Cr+6 Plated

Diameter / Thread: 5/16″-18 UNC

Machinery and equipment anchoring

Drive: Internal Torx® (6-lobe star) T15 for reliable torque transfer with zero cam-out

and mechanical assemblies requiring strength and a clean finish

Bulk Heavy Hex Nuts – A563 Grade C, Plain Finish, Coarse Thread, Made in USA – Monster B Size:1800 Qty - 5/8"-11 Bulk USS Flat Washers –Monster Overview Fix your project right the first time with A563 Grade C Heavy Hex Nuts from Monster Bolts. These structural heavy hex nuts are Made in the USA and designed for use in construction, structural steel, machinery, OEM fabrication, and industrial installations. The heavy hex pattern provides a larger bearing surface and wrenching flat compared to standard finished hex nuts, delivering improved clamping force and durability in high load