Flange nuts have a flat surface area preventing sinking and distributing holding force evenly. They are useful for fastening wood and metal parts and come in various sizes and materials. Flange bolts are similar with a hex head and attached flange. Swivel flanges prevent damage to surfaces.
A flange nut is a nut that has one side shaped with a large, flat surface area. The surface, or flange, works like a washer by preventing the nut from sinking into the fastened surface when it is screwed onto the end of a bolt. It also distributes the holding force of the nut evenly across its surface to provide a more secure fastening. Flange nuts are useful for fastening wood and metal parts and are widely used in carpentry, auto repair and industry. They are available in a variety of sizes and materials.
The flange may have holes through which screws or other fasteners can be driven to hold the nut to the surface to be fastened. Pre-attaching the flange to a surface provides a convenient method of attaching something to it via a bolt or metal rod, which can be inserted into the fixed nut and tightened. The holes are also suitable for inserting skids, so machine adjustments can be made by turning a threaded rod inserted into the flange nut.
Most flange nuts are hex. The flange is sometimes notched to give the nut a better seal. The serrations bite into the surface as the nut is tightened and are angled to prevent counter-clockwise rotation which would backlash and loosen the nut. A hex flange nut can be made of hardened steel or titanium and coated with a zinc plated or chrome plated finish. If it’s serrated, hardened steel allows the serrations to bite into almost any material.
To prevent damage to the surfaces being joined, a flange nut may also have a swivel flange that functions much like a washer. A swivel flange stays put when the nut is rotated, allowing more torque to be applied without the danger of the flange scratching the surface or wearing it off. A swivel flange nut is very useful for joining wood and plastic.
A flange bolt is similar to a flange nut. It usually has a hex head and the flange is attached to the base of the head. As with a flange nut, the flange acts like a washer, preventing the bolt head from wedging into the surface and providing extra holding force. Both flange bolts and flange nuts can have lugs so they can be hand tightened. A wing nut with a flange is useful for light duty fastening applications.
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