Bulk Heavy Hex Nuts – A563 Grade C, Plain Finish, Coarse Thread, Made in USA – Monster B Size:1800 Qty - 5/8"-11 Serrated Self-Locking Flange: Integrated washer

Serrated Self-Locking Flange: Integrated washer head grips the workpiece to resist loosening

Matching Washers: 3/8" Flat Washers - Available here

standard metric) Head / Angle Flat (Countersunk) — 90° included angle Head / Drive Socket — Hex 5

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

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 Serrated Self-Locking Flange: Integrated washerMonster 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