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The Unifix External Serrated Washers DIN 6798A are essential hardware components for professionals and DIY enthusiasts who require secure, vibration-resistant fastening. These silver, bright zinc-plated washers are specifically engineered for M4 screw applications to prevent loosening over time, though they are sold in a high-volume bulk box of 2000 units, making them more suitable for large-scale projects than individual household repairs.
| Colour | Silver |
|---|---|
| Model Part Number | 1316670 |
| Brand | Unifix |
No, these are strictly sized for M4 screws to ensure a proper fit and locking mechanism.
While they can be removed, the serrated teeth are designed to deform slightly into the surface, so they may lose some efficacy if reused repeatedly.
They are zinc-plated for corrosion resistance, but they are not stainless steel and should be kept away from harsh or wet outdoor environments.
The serrations should be positioned against the flat surface of the workpiece to provide the necessary grip.
Each box contains 2000 units.
Ensure the bolt is properly aligned; the serrated teeth should engage as soon as torque is applied.
The serrated design is meant to 'bite' the surface; if the finish is delicate, place a thin flat washer between the component and the serrated washer.
Installation is straightforward: place the serrated washer onto the M4 bolt shaft before tightening it against the mating surface. Ensure the washer sits flat against the component before applying final torque. While the bright zinc-plated finish offers good baseline protection, avoid using these in direct exposure to harsh weather or acidic conditions to prevent premature oxidation. For long-term storage, keep the bulk box in a cool, dry area to ensure the protective plating remains intact.
