Heavy Hex Nuts

Heavy Hex Nuts

Heavy hex nuts are slightly larger ,Thicker and Wider Across The Flats Than Standard Hex Nuts.the heavy pattern is typically used for large diameter and high strength bolts.
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Product Details

Name: Heavy Hex Nuts

Descriptions: Heavy hex nuts are slightly larger ,Thicker and Wider Across The Flats Than Standard Hex Nuts.the heavy pattern is typically used for large diameter and high strength bolts. A six-sided internally threaded fastener which is both thicker and wider across the flats than a same-sized finished hex nut. Nuts in sizes 7/16 and smaller shall be double chamfered. Larger sizes are either double chamfered or chamfered on top with a washer faced bearing surface.


Applications: This is the strongest of all comparably-graded nuts because of its greater length of thread engagement and greater resistance to dilation (widening or stretching). Grade-A nuts are used with low-carbon heavy hex bolts. Grade-C nuts are recommended for use with A-325 structural bolts. Grade-2H nuts are recommended for use with bolts in high-pressure and high-temperature service. Grade-DH nuts are recommended for use with A-490, Type-1 structural bolts and Grade-DH3 nuts for use with A-490, Type-3 structural bolts.


Size: Diameters: 3/8″ – 2-3/4″

Finish: Plain and hot-dip galvanized

Grades: A563 (grades A, C, and DH), A194 grade 2H


Material: Nuts shall be made from a steel which conforms to the following chemical composition requirements (heat analysis)--Grades-A & C-- Carbon: 0.55% maximum; Phosphorus: 0.12% maximum; Sulfur: 0.023% maximum.

A 194 Grade-2H-- Carbon: 0.40% minimum; Manganese: 1.00% maximum; Phosphorus: 0.04% maximum; Sulfur: 0.05% maximum; Silicon: 0.40% maximum.

A 563 Grade-DH-- Carbon: 0.20-0.55%; Manganese: 0.60% minimum; Phosphorus: 0.04% maximum; Sulfur: 0.05% maximum. Grade-DH3-- Carbon: 0.20-0.53%; Manganese: 0.40% minimum; Phosphorus: 0.046% maximum; Sulfur: 0.050% maximum;

Copper: 0.20% minimum; Chromium: 0.45% minimum; (Either Nickel: 0.20% minimum or Molybdenum: 0.15% minimum, may be used).


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