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The Unifix Internal Serrated Washers DIN 6798J M4 are essential components for mechanics, engineers, and DIY enthusiasts looking to secure fasteners against vibration-induced loosening. These washers provide superior grip through their specialized internal teeth, ensuring long-term stability for automotive and construction assemblies. Please note that while the bright zinc plating offers decent corrosion resistance, these are best suited for indoor or sheltered environments rather than harsh, salt-heavy outdoor conditions.
| Colour | Silver |
|---|---|
| Model Part Number | 1316680 |
| Brand | Unifix |
While technically possible, it is recommended to replace them as the serrated teeth may be deformed or dulled after the initial tightening process.
Yes, they can be used with stainless steel bolts, though be aware of potential galvanic corrosion if the assembly is exposed to moisture.
It refers to the German industrial standard for internal serrated lock washers, ensuring a specific geometry and tooth configuration.
They offer some protection, but for permanent outdoor exposure, stainless steel or hot-dip galvanized alternatives are preferred.
Each box contains 2000 units.
The serrated teeth are designed to bite into the surface for grip; if surface finish is a concern, use a flat washer beneath the serrated washer to protect the substrate.
Ensure the washer is centered correctly on the bolt shank; off-center washers can interfere with the thread engagement.
For optimal results, ensure the M4 fastener is threaded correctly before fully tightening to avoid cross-threading. The washer should be placed between the head of the bolt (or nut) and the component being secured, with the serrated side facing the fastening hardware to maximize grip.
Compatibility: These washers are strictly for M4 sized hardware. Attempting to use them on larger bolts will prevent the teeth from seating properly, while using them on smaller bolts may result in the washer slipping.
Care: While the bright zinc plating is resistant to oxidation, it is not immune. If stored in a high-humidity environment, keep the box tightly sealed. If used in a workshop setting, avoid using harsh industrial degreasers that may strip the protective zinc coating.
