Hex Nuts

Hex Nuts A563 A194 F594

Hex nuts (also referred to as finished hex nut) are available in ASTM A563-A and compatible with low carbon steel bolts such as ASTM A307, ASTM F1554 grade 36, SAE grade 2, and AASHTO M183. SAE grade 5 and grade 8 nuts are also available in a finished pattern. Since hot-dip galvanizing typically adds 2.2 to 5 mils of thickness to the threaded portion of a fastener, galvanized hex nut are tapped oversize to compensate for the corrosion resistant coating on the bolts.

Hex nuts are used with mating screws and bolts to help secure items. They have a hex-shaped body, which has flats that can be gripped with a wrench for turning to tighten and untighten in fastening applications. Allowing for easy assembly and disassembly, hexagonal or hexagon nuts are the most common nut type. Hex nut sizes are indicated in either metric or inch systems of measurement. Common dimensions include internal thread size and pitch width across flats. Specifications such as ASTM and ISO are typical for hex nut and will also define some of the product’s dimensions and qualifications. Large hexagonal nut are often made from steel for strength, and brass hex nut are often used in general-purpose applications requiring some corrosion resistance. They may be finished with a coating or plating for additional enhanced performance and protection. There are several different styles manufactured for diverse purposes. Slotted hex nut are designed with special slots that accept a locking mechanism, such as a cotter pin.