Heavy Hex Nut
Heavy hex nuts are thicker and wider than (finished) hex nuts of the same size, which makes them the strongest of comparably-graded nuts. Their additional strength comes from increased thread engagement, which is due to their thickness, and greater resistance to dilation (expansion or stretching) because of their larger width. The heavy hex nut's increased size yields a larger bearing surface and improved wrenchability. Hex is short for hexagon, which means they have six sides. They are also known as: heavy nuts. Lock washers may used with heavy hex nuts.
Heavy Hex Nut
Material: Carbon Steel, Alloy Steel, Stainless Steel
Standard: ASME/ANSI B18.2.2 ISO4775
Measurement system: INCH, Metric
Size: 1/4''–4’’; M6 – M100
Grade / Class: ASTM A194 2, 2H, 4, 7, 7M,8, 8M; A563 Gr. A, C,
Thread: M, UNC, UNF
Finish: Black Oxide, Zinc Plated(Clear/Blue/Yellow/Black),H.D.G , Y.Z.P ,Plain, Nickel, Chrome.
Heavy hex nuts are slightly larger and thicker than standard (finished) hex nuts. There are numerous grades and the heavy pattern is typically used for large diameter and high strength bolts. See our nut compatibility chart to determine the compatible heavy hex nut(s) for a specific grade of bolt. Since hot-dip galvanizing typically adds 2.2 to 5 mils of thickness to the threaded portion of a fastener, galvanized heavy hex nuts are tapped oversize to compensate for the corrosion-resistant coating on the bolts.
