Hex Flange Bolt (DIN 6921 / ISO 15071)
A hex flange bolt has an integrated washer-like flange under the hex head that distributes clamping load over a wider area, eliminating the need for a separate flat washer. Serrated flange variants (DIN 6921) provide additional anti-loosening grip on softer materials.
Specifications
| Standards | DIN 6921 (serrated), ISO 15071, JIS B 1189 |
|---|---|
| Property Class | 8.8, 10.9, 12.9 |
| Diameter Range | M6 – M20 |
| Flange Type | Smooth or serrated underside |
| Surface Finish | Zinc plated, Yellow zinc, Geomet, Dacromet |
| Common Application | Automotive chassis, agricultural machinery, light steel framing |
Frequently Asked Questions
Why use a flange bolt instead of a hex bolt with a washer?
Flange bolts reduce parts count (one piece instead of two) and assembly time, and the integrated flange cannot be forgotten or installed backwards. Serrated flange bolts also provide a measure of vibration resistance on softer mating surfaces because the serrations bite into the surface.
Are serrated flange bolts reusable?
Reusing a serrated flange bolt on the same hardened mating surface is generally acceptable. However, on softer surfaces (aluminum, painted steel) the serrations leave permanent indentations, which can reduce clamping effectiveness on reuse. For critical assemblies, use a new bolt on each installation.
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