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B&Q£8.78Visit shop B&Q - A4 Marine Grade Stainless Steel Flat Washers (Din 125 Iso 7089)M12Pack Of 1
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The Diyuk Flat Washers DIN 125 ISO 7089 Form A are high-performance fastening components designed for professionals and DIY enthusiasts working in harsh, corrosive, or marine environments. These washers provide exceptional load distribution and long-term structural integrity due to their premium A4 (316) marine-grade stainless steel construction. While they offer superior durability against chlorides and chemicals, users should ensure they are selecting the correct metric size to match their existing bolts and nuts for optimal flush-fit performance.
| Colour | Silver |
|---|---|
| Brand | Diyuk |
Form A refers to the standard flat washer profile without a chamfer, providing a wider bearing surface for general-purpose use.
While technically possible, it is recommended to pair stainless steel washers with compatible stainless bolts to prevent galvanic corrosion.
No, A4 (316) contains molybdenum, which offers significantly higher resistance to corrosion in salt and acidic environments compared to A2 (304) steel.
200HV (Vickers Hardness) indicates the material's resistance to deformation, ensuring the washer remains flat under significant clamping force.
These flat washers provide stable load distribution, but for high-vibration environments, you may need to pair them with a locking mechanism or spring washer.
Check for debris or surface irregularities; ensure the bolt diameter matches the washer inner diameter exactly.
Verify that the correct tightening torque was applied and ensure the washer is not being forced onto an incompatible bolt thread.
For proper installation, ensure the washer size corresponds exactly to the nominal diameter of the bolt. Place the flat washer onto the bolt shank before threading it through the assembly surface to act as a bearing base. No special tools are required, though care should be taken not to over-torque beyond the fastener's limit. While A4 stainless steel is highly resistant to oxidation, it is recommended to keep the hardware free of debris during installation to ensure a flush seal. If the hardware is exposed to heavy saltwater, occasional freshwater rinsing can help maintain its appearance and longevity.
