Flange Bolts

Flange hex bolts, also known as flange head bolts or flange screws, are fasteners that combine the features of a hexagonal head bolt and a flanged washer.  They are commonly used in applications where a secure and reliable joint is required.

Flange hex bolts consist of a hexagonal head, a threaded shank, and an integral washer-like flange beneath the head. The flange is a circular disc with a larger diameter than the bolt's shank, providing a broader load-bearing surface.  The head of a flange hex bolt is shaped like a hexagon, allowing it to be tightened or loosened with a standard hex wrench or socket. This design provides a secure grip and facilitates easy installation and removal.

The integral flange washer is a flat circular disc located directly beneath the bolt head. It serves multiple purposes, including distributing the load over a wider area, reducing the risk of surface damage, and preventing the bolt from sinking into the material.  The flange on the bolt head increases the bearing surface area, providing enhanced resistance to vibration, loosening, and rotation. This helps to create a more stable and secure joint, particularly in applications subject to dynamic forces.

We stock them in part thread (Din 931) and full thread (Din 933) also referred to as a setscrew. They are high tensile grade 8.8 and 10.9, in zinc, zinc yellow and unplated steel.  We also have a large stock of M10 x 170 Flange Bolts in A4 stainless Steel.