Flange Bolt

A flange bolt is a threaded fastener with a wide, integrated flange under the head. The flange spreads the clamping load over a larger area than a plain bolt head.

A flange bolt clamps two or more parts through a drilled hole. Its flange spreads the load over a wider area, so it often removes the need for a separate washer. It takes a nut of the same thread and class, and a spanner or socket turns it.

Flange bolts are often made in steel, and can be supplied in stainless steel or other alloys for specific environments. The material choice affects corrosion resistance and strength.

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 the application needs traceability. On receipt, check the flange diameter, head marking, thread condition and surface finish against your order.