Fastenal is the largest fastener distributor in North America. Shop our huge selection of OEM, MRO, construction, industrial, and safety products.

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Top lock nuts have a crimped top section that creates a locking thread distortion with the mated fastener. Top lock nuts may only be installed in one direction. Flange nuts have integrated washers that increase the load bearing area and help prevent damage to the mating surface.

Fastenal is the largest fastener distributor in North America. Shop our huge selection of OEM, MRO, construction, industrial, and safety products.

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This hexagonal headed fastener is designed to be screwed into a tapped (pre-threaded) hole or secured with a nut. The underside of these heads are washer faces and the point ends are chamfered. These are used in more specialized situations than hex bolts.

Structural bolts are specifically designed for use with heavy hex nuts in the connection of structural members (as opposed to tapped holes). The nuts for structural connections shall conform to ASTM A563 or ASTM A194. The following …

The torque values can only be achieved if nut (or tapped hole) has a proof load greater than or equal to the bolt's minimum ultimate tensile strength. Clamp load calculated as 75% of the proof load when specified by the standard.

This finish, also know as zinc plating, zinc chromate or dichromate provides good corrosion resistance and is the standard for many hardware fasteners. It is an electroplated zinc layer covered with a chromate post-treatment.

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