Hex Flange Bolt

A hex flange bolt is a bolt with a hexagonal head and a flange under the head. The flange spreads the load over a larger area and can reduce the need for a washer.

A hex flange bolt tightens with a spanner or socket on the hex head. The flange spreads the clamping load over a wider area and can reduce the need for a separate washer. It takes a nut of the same thread and class where the joint is not tapped.

This kind of bolt is usually made of steel. Steel can be heat treated to different strength grades. It can be coated for corrosion resistance.

This is a general guide to checking this kind of part. It says nothing about any supplier's parts.

Ask for a certificate of conformance or a mill test certificate if you need to verify the grade. On receipt, check the bolt for correct thread size and length. Look for damage such as cracks or damaged threads.