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Internal Tooth Washer Spec Table
Internal Tooth Washer Specifications — 18 sizes
DIN 6798JDIN 6798 J
An internal tooth lock washer that prevents rotation under the bolt head, mainly used with small screws.
Practical Notes
- Hidden under bolt head for clean appearance. Mainly for small screws (M3–M6).
- Provides both locking and surface protection on soft metals like aluminum and copper.
Selection Guide
Internal teeth hide under the bolt head for a clean appearance. Mainly for small screws (M3–M6); provides locking effect while protecting soft metal surfaces like aluminum and copper.
DINInternal Tooth Washer
6 sizesThe dimensions below are identical across DIN 6798J · DIN 6798 J.
| Nominal | d1 (Inner) | d2 (Outer) | h (Thick) | Type | Material |
|---|---|---|---|---|---|
| M3 | 3.2 | 6 | 0.4 | Int. Tooth Washer | - |
| M4 | 4.3 | 8 | 0.5 | Int. Tooth Washer | - |
| M5 | 5.3 | 9 | 0.6 | Int. Tooth Washer | - |
| M6 | 6.4 | 10 | 0.7 | Int. Tooth Washer | - |
| M8 | 8.4 | 13 | 0.8 | Int. Tooth Washer | - |
| M10 | 10.5 | 16 | 0.9 | Int. Tooth Washer | - |
Key Features
- Internal serrations hidden under bolt head for clean appearance; minimal surface damage
- DIN 6798J; smaller than bolt head diameter for zero external exposure
- Provides locking effect while protecting surfaces on soft metals (aluminum, copper)
Key Applications
Appearance-critical product interiors, aluminum housings, copper busbar fastening, electronics internals, measuring instruments
FAQ
Difference between internal and external tooth washers?
Internal teeth hide under bolt heads for clean appearance, suited for small screws. External teeth provide larger contact area for stronger locking and effective grounding.