Flange Bolt

A flange bolt is a component used in fabricated metal product manufacturing, combining a hexagonal driving head with an integral flange that spreads bearing load over a larger area. This design simplifies installation by eliminating the need for a separate washer in many applications. Flange bolts are commonly used in machinery, automotive, and fabricated assemblies where an integral bearing face is advantageous. When specifying a flange bolt, buyers should clearly define the flange type, thread, length, property class, serration, material, and finish. The applicable standard listed here, ISO 4162:2012, governs particular forms and dimensions, but it does not make sizes, materials, or finishes interchangeable across different standards or manufacturers. Therefore, the request for quotation (RFQ) must state the exact standard or drawing, required configuration, quantity, and inspection evidence. The material options on file include carbon or alloy steel and A2 stainless steel, with strength classes such as 8.8–10.9 or A2-70 within the scope of ISO 4162. Surface finishes may be plain, zinc-plated, or a specified coating. Nominal sizes range from M5 to M16 within the standard's scope. It is essential to confirm all model-specific values, including dimensions, mechanical properties, and coating, against the selected standard, the drawing, and supplier evidence. This directory entry serves as a neutral reference; it does not imply certification or compliance of any specific product. Always verify with the legal manufacturer or supplier before procurement.

When a flange bolt is tightened, the applied torque creates tension in the bolt, which generates clamp load across the joint. The integral flange distributes the head-side bearing pressure over a larger area compared to a standard hex head, reducing surface stress and preventing damage to softer materials. The flange also helps maintain alignment and can provide a larger friction surface, which may influence torque retention. The working principle relies on the elastic deformation of the bolt and the compression of the joined parts, ensuring a secure connection under specified preload conditions.