Bulk Heavy Hex Nuts - Structural Hex Nut Supplier | AFT Fasteners

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Structural & Heavy Hex Nuts

Heavy Hex Nuts, also called structural nuts, are both thicker and wider than a standard (finished) hex nut and compatible with high strength and large diameter bolts. Nuts in sizes 7/16" and smaller are double chamfered. Nuts larger than 7/16" are either double chamfered or chamfered on top with a washer faced bearing surface. They are most commonly used in construction and engineering applications and paired with heavy hex (structural) bolts.

AFT Fasteners is your trusted heavy hex nut supplier. Please search our products online or contact us anytime with questions. We're here to help!

Heavy Hex Nut Grades

Grade A Heavy Hex Nuts

Grade A Heavy Hex Nuts are paired with low carbon heavy hex bolts. They are made from steel with the following chemical composition: Carbon: 0.55% max; Phosphorus: 0.12% max; Sulfur: 0.023% max. Grade A Nuts have a Core Hardness of Rockwell B68-C32.

Grade C Heavy Hex Nuts

Grade C Nuts are recommended for use with A-325 structural bolts. They are made from steel with the following chemical composition: Carbon: 0.55% max; Phosphorus: 0.12% max; Sulfur: 0.023% max. Grade C Nuts have a Core Hardness of Rockwell B78-C38.

A 194 Grade 2H Heavy Hex Nuts

Grade 2H nuts are recommended for use with bolts in high-pressure and high-temperature applications. They are made from steel with the following chemical composition: Carbon: 0.4% min; Manganese: 1.0% max; Phosphorus: 0.04% max; Sulfur: 0.05% max; Silicon: 0.40% max. Grade 2H Nuts are heat-treated and have a Core Hardness of Rockwell C24-C38.

A 563 Grade DH Heavy Hex Nuts

Grade DH Nuts are recommended for use with A-490, Type 1 structural bolts. They are made from steel with the following chemical composition: Carbon: 0.20-0.55% min; Manganese: .60% min; Phosphorus: 0.04% max; Sulfur: 0.05% max. Grade DH Nuts are heat-treated and have a Core Hardness of Rockwell C24-C38.

A 563 Grade DH3 Heavy Hex Nuts

Grade DH 3 Nuts are for use with A-490, Type 3 structural bolts. Grade DH3 Nuts are heat-treated and have a Core Hardness of Rockwell C24-C38.

View our Heavy Hex Nut Technical Guide, which includes a dimensional chart and other specs.

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