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Structural Nuts

Structural Nuts and heavy hex nuts are six-sided hex nuts that are thicker and wider across the flats than a same size diameter finished hex nut. ASTM A563C and DH and ASTM A194 2-H structural nuts are high strength nuts that are designed to be stronger than the bolts assembled with them.

Structural Heavy Hex Finish Nuts, also known as Heavy Hex Nuts, Heavy hex finish nuts, and structural heavy hex nuts, are used for many fastening applications. Heavy hex finish nuts are often used with bolts when a heavier, stronger and thicker nut is needed, often for strength or a thicker finished look. Structural nuts such as these can help increase the load capacity of the bolt fastened to it.

The hexagonal shape makes these nuts easy to grasp with a wrench or pliers. They are installed on the opposite side of the materials being fastened. With the bolt head or machine screw head on the other side, they compress the materials together for a secure fit.

Structural A563 Heavy Hex Nuts are thick, strong heavy duty nuts typically used to create structures through steel to steel structural connections. They are often applied alongside structural bolts and washers to metal beams and girders. Compatible with A325 and A490 Structural Bolts.

Product Parameters

Product name: Structural Nuts

Material: Carbon Steel, Alloy Steel, Stainless Steel

Standard:  ASME/ANSI B18.2.2; ISO4775

Measurement system: INCH, Metric

Size: 1/4''–1-1/2’’; M6 – M42

Grade / Class: SAE J995 Gr.2, 5,8; CL4, 5, 6, 8, 10, 12

Thread: M, UNC, UNF

Finish: Black Oxide, Zinc Plated(Clear/Blue/Yellow/Black),H.D.G , Y.Z.P ,Plain, Nickel, Chrome.

Description

The structural nut connection has the advantages of simple construction, good performance, removable, fatigue-resistant, and no looseness under dynamic load, and is a promising connection method.

The structural nut is tightened with a special wrench to create a large and controlled pre-tension of the bolt. Through the nut and the backing plate, the same amount of pre-stress is also applied to the connected piece. Under the pre-pressure, a large friction force will be generated along the surface of the connected member. Obviously, as long as the axial force is less than the frictional force, the member will not slip and the connection will not be damaged. This is the structural nut connection principle.

The structural nut connection is prevented from slipping each other by the frictional force between the contact surfaces of the connecting members. In order to make the contact surface have sufficient friction, it is necessary to increase the clamping force of the member and increase the friction coefficient of the contact surface of the member. The clamping force between the components is achieved by applying a pre-tension to the bolts, so the bolts must be made of high-strength steel, which is why they are called high-strength bolted connections.

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