Hexagonal nuts are a common type of internally threaded fastening solution used in conjunction with bolts or screws. They are available in a variety of sizes, materials and finishes to meet the needs of different applications.
Hex nuts have six sides, which increases their ease of turning compared to square fasteners. A square nut requires a one-quarter turn each time to reach the next flat parallel, while hexagonal nuts require a one-sixth turn to complete each turn.
They are available in various materials and finishes, including stainless steel, brass, copper alloys, aluminum and nylon. Most are zinc plated (which is the least expensive commercial finish and offers moderate corrosion resistance) or hot dip galvanized.
Finished hex nuts are designed to be used in conjunction with mating threaded hardware to provide a strong, secure fit. They are also crafted to provide uniform pressure distribution around their mating surfaces when tightened.
Strength grades
Hex nuts come in several strength "grades," as defined by the Society of Automotive Engineers. Grade 2 is the weakest; Grade 5 offers medium strength and Grade 8 is the strongest.
They are a commonly found type of internally threaded fastening solutions and are available in a variety of metric and imperial sizes. They are crafted from carbon and stainless steel, as well as nylon.
They can be tapped oversize and used with hot dipped galvanized bolts to form a secure fit, but it is advisable to choose a nut finish that matches the material of the bolt/screw. Using a hex nut that is not suited to the bolt/screw type or finished will result in an unacceptably loose fit.
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