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External Tooth Washer Spec Table
External Tooth Washer Specifications — 18 sizes
DIN 6798ADIN 6798 A
An external tooth lock washer that bites into the surface to prevent loosening, also effective for electrical grounding.
Practical Notes
- Effective for electrical grounding. Teeth penetrate paint to establish electrical conduction paths.
- Teeth leave marks on mating surfaces — avoid where appearance matters.
Selection Guide
External teeth bite into surfaces to prevent rotation. Especially effective for electrical grounding (penetrates paint for conduction). Suitable for light-duty sheet metal fastening under vibration.
DINExternal Tooth Washer
6 sizesThe dimensions below are identical across DIN 6798A · DIN 6798 A.
| Nominal | d1 (Inner) | d2 (Outer) | h (Thick) | Type | Material |
|---|---|---|---|---|---|
| M3 | 3.2 | 6 | 0.4 | Ext. Tooth Washer | - |
| M4 | 4.3 | 8 | 0.5 | Ext. Tooth Washer | - |
| M5 | 5.3 | 10 | 0.6 | Ext. Tooth Washer | - |
| M6 | 6.4 | 11 | 0.7 | Ext. Tooth Washer | - |
| M8 | 8.4 | 15 | 0.8 | Ext. Tooth Washer | - |
| M10 | 10.5 | 18 | 0.9 | Ext. Tooth Washer | - |
Key Features
- External serrations grip mating surface to maximize rotational resistance
- DIN 6798A; serrations extend beyond bolt head for visual confirmation
- Especially effective on thin sheet/painted surfaces; suited for light-duty vibration fastening
Key Applications
Electrical grounding (penetrating paint), appliance sheet metal, electronics covers, instrument panels, lightweight brackets
FAQ
Why are tooth washers effective for electrical grounding?
External teeth penetrate paint and oxide layers to ensure direct metal-to-metal contact (electrical conduction), effectively reducing ground resistance.