A nut is a type of fastener with a threaded hole. Nuts are almost always used in conjunction with a mating bolt to fasten multiple parts together. 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. These Heavy Hex Nuts are manufactured by us in Alloy Steel, carbon steel, stainless steel & Duplex Steel. Popular carbon steel grades include A 194 and A 320. Grades include 2, 2H, 2HM, 8, 8M, B8 (Class 1 and 2), A2-50, A2-70, A2-80, SS 316, SS 316S 31 etc. 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 oversized to compensate for the corrosion-resistant coating on the bolts.
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