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Flange Bolt Spec Table
Flange Bolt KS Specifications — 10 sizes
DIN 6921
DINFlange Bolt
10 sizes| Nominal | Wrench AF (mm) | Flange Dia (mm) | Standard | - | - |
|---|---|---|---|---|---|
| M5 | 8 | 11.8 | DIN 6921 | - | - |
| M6 | 10 | 14.2 | DIN 6921 | - | - |
| M8 | 13 | 17.9 | DIN 6921 | - | - |
| M10 | 15 | 21.8 | DIN 6921 | - | - |
| M12 | 18 | 26 | DIN 6921 | - | - |
| M14 | 21 | 29.9 | DIN 6921 | - | - |
| M16 | 24 | 34.5 | DIN 6921 | - | - |
| M18 | 27 | 39.9 | DIN 6921 | - | - |
| M20 | 30 | 42.8 | DIN 6921 | - | - |
| M24 | 34 | 51.1 | DIN 6921 | - | - |
This specification follows DIN (Deutsches Institut für Normung, German Industrial Standard). It is essential when maintaining German or European-sourced equipment and when supplying to the European market.
Across-flats (AF) reference for DIN 6921 / ISO 15072 flange bolts from M5 to M24, including the flange diameter. Flange bolts typically use a smaller AF than standard hex bolts (M10 AF 15, M12 AF 18), so generic spanners cannot tighten them — a dedicated flanged socket is required. The integrated flange acts as a built-in washer, distributing the bearing load without a separate part. Standard structural fastener for automotive and heavy machinery.