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Hex Flange Bolt Spec Table
Hex Flange Bolt Specifications — 7 sizes
KS B 1042
A hex bolt with an integrated flange under the head, providing a large bearing surface without a separate washer. Widely used in automotive and machinery assembly under vibration.
Practical Notes
- Serrated flanges bite into painted/plated surfaces for anti-loosening. However, they leave marks — use non-serrated for appearance-critical areas.
- The flange acts as a washer — do not add separate washers. Extra washers negate the flange bearing surface.
Selection Guide
Integral flange serves as washer, providing a wide bearing surface without separate washers. Standard in automotive and industrial machinery with high vibration. Serrated flanges add anti-loosening effect. Eliminates washers, reducing assembly steps and part count.
KSHex Flange Bolt
7 sizes| Nominal | d | P | dk (Flange Dia) | s (Wrench) | k (Head H.) |
|---|---|---|---|---|---|
| M6 | 6 | 1 | 11.8 | 10 | 4 |
| M8 | 8 | 1.25 | 15.8 | 13 | 5.3 |
| M10 | 10 | 1.5 | 19.6 | 15 | 6.63 |
| M12 | 12 | 1.75 | 23.6 | 18 | 7.76 |
| M14 | 14 | 2 | 27.6 | 21 | 9 |
| M16 | 16 | 2 | 31.6 | 24 | 10 |
| M20 | 20 | 2.5 | 39.6 | 30 | 12.5 |
Key Features
- Integral flange acts as washer, providing wide bearing surface without separate washer
- Serrated flange underside prevents vibration loosening
- KS B 1058 / ISO 4162; automotive fastening standard contributing to weight reduction
Key Applications
Automotive engine/transmission, industrial motor mounts, pipe flanges, conveyor frames, agricultural machinery
FAQ
Difference between serrated and non-serrated flange?
Serrated teeth bite into surfaces for anti-loosening but leave marks. Non-serrated provides wide bearing surface without marks. Choose non-serrated for appearance-critical areas.