Flange Nut Spec Table
A nut with an integrated flange that provides a wide bearing surface without a separate washer. Effective in high-vibration environments.
Practical Notes
- Serrated flange nut anti-loosening effect decreases with reuse. Use new nuts each time for safety-critical joints.
- Adding washers under flange nuts negates the flange effect. Use without separate washers.
Selection Guide
Ideal for wide bearing surface without washers, especially in high-vibration environments. Serrated flanges bite into surfaces to prevent loosening. Standard in automotive suspension and engine mounts. Replaces flat washer + hex nut combinations to reduce parts and assembly steps.
Flange NutDINISOJISFlange Nut
7 sizesThe dimensions below are identical across DIN 6923 · ISO 4161 · JIS B 1190.
| Nominal | d | P | H (Height) | B (Wrench) | Other |
|---|---|---|---|---|---|
| M4 | 4 | 0.7 | 5 | 7 | 8.1 |
| M5 | 5 | 0.8 | 5.5 | 8 | 9.2 |
| M6 | 6 | 1 | 6 | 10 | 11.5 |
| M8 | 8 | 1.25 | 8 | 13 | 15 |
| M10 | 10 | 1.5 | 8.7 | 15 | 17.3 |
| M12 | 12 | 1.75 | 11.2 | 18 | 20.8 |
| M16 | 16 | 2 | 14 | 24 | 27.7 |
Key Features
- Integral bottom flange eliminates washer; reduces assembly steps
- Serrated flange type provides anti-vibration self-locking function
- DIN 6923 / ISO 4161; adopted as standard in automotive and industrial machinery lines
Key Applications
Automotive suspension, engine mounts, conveyor bolt fastening, vibrating equipment, agricultural machinery
STEP File Downloads
Free 3D CAD models (STEP AP214). Built to real standard dimensions; threads are simplified (plain shank) per free-library convention.
FAQ
Flange nut vs flat washer + hex nut?
Functionally similar, but flange nuts reduce part count and assembly steps. Serrated versions add anti-loosening capability.