Heavy Hex Nuts - Structural Nuts

Heavy hex nuts, also known as structural nuts, are a larger type of hex nut 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. 

Frequently Asked Questions About Heavy Hex Nuts

What are heavy hex nuts used for? 

Heavy hex nuts are commonly used in construction and engineering applications and paired with heavy hex (structural) bolts. 

What grades are heavy hex nuts available in? 

Heavy hex nuts are available in Grade A (paired with low carbon heavy hex bolts), Grade C (use with A-325 structural bolts), A194 Grade 2H (use in high pressure and high temperature applications), A563 Grade DH (use with A490, Type 1 structural bolts), A563 Grade DH3 (use with A490, Type 3 structural bolts). 

What is the difference between a heavy hex nut and a standard hex nut? 

A heavy hex nut is both thicker and wider than a standard hex nut. 

What sizes do heavy hex nuts come in? 

AFT offers heavy hex nuts in both imperial and metric sizes. Diameter-thread sizes range from 1/4”-20 to 4”-4 or M12-1.75 to M64-6.00. 

What materials and finishes are heavy hex nuts available in? 

Heavy hex nuts are available in a plethora of materials and finishes. They are made of steel, stainless steel, brass, silicon bronze, ni-cu alloy steel, or aluminum. Finishes include cadmium yellow, hot dipped galvanized, hot dipped galvanized and wax, hot dipped galvanized and wax/blue dye, nanogalv, plain, xylan blue/teflon, zinc Cr+3, and zinc yellow. Stainless steel or zinc offer extra corrosion resistance.