Description
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 joints.
Manufactured to ASTM A563 Grade C requirements, these nuts are typically paired with compatible structural and heavy hex bolts for building, equipment, and infrastructure applications. The plain (uncoated) finish is ideal for controlled environments, assemblies receiving project-level coatings, or applications where surface treatment is specified separately. Available in bulk quantities, these nuts are a great fit for shops, job sites, and maintenance departments that need reliable USA-made structural hardware on hand.
Monster Features
- Structural Grade: A563 Grade C heavy hex nuts for structural and industrial use.
- Nut Style: Heavy hex profile for greater wrench contact and bearing surface.
- Thread: Coarse thread (UNC) for common construction and equipment applications.
- Finish: Plain (uncoated) finish for controlled environments or post-applied coatings.
- Origin: 100% Made in USA for traceable quality and spec compliance.
- Bulk Quantities: Cost-effective for contractors, fabricators, and industrial users who need stocked bins.
Monster Specifications
| Specification | Details |
|---|---|
| Nut Type | Heavy Hex Nut |
| Grade | ASTM A563 Grade C |
| Thread | UNC / Coarse Thread (inch series) |
| Finish | Plain (uncoated / unplated) |
| Material | Carbon steel meeting Grade C requirements |
| Country of Origin | Made in USA |
| Standards | ASTM A563 Grade C; ASME heavy hex nut dimensions |
| System of Measurement | Inch / SAE |
| Sizes Available | Offered in common A563 Grade C heavy hex nut sizes; select from the options above. |
More Monster Products
Matching Hardware: These heavy hex nuts are intended for use with compatible structural and heavy hex bolts. For complementary USA-made fasteners, visit our Made in USA Fasteners Collection to find bolts, washers, and related hardware.
Order Yours Today
Keep your projects moving with dependable USA-Made A563 Grade C Heavy Hex Nuts in bulk. Choose your size and quantity above, then click “Add to Cart” to stock up on structural-grade nuts you can rely on.