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Power Tools Direct£1.38Visit shop Fpkfw840 Forgefix Flat Washer
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B&Q£5.09Visit shop B&Q - Fpkfw840 Flat Washers Zp M8 X 40mm Forgepack 6 Forfpkfw840
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Designed for professional contractors and home DIY enthusiasts alike, the Forgefix Flat Washers (M8 x 40mm) provide a reliable load-distributing surface for various fastening projects. These bright zinc-plated washers effectively prevent joint loosening and protect surfaces from damage caused by bolt or nut friction, though they are specifically intended for interior or sheltered exterior use due to their zinc-coated finish rather than heavy-duty marine-grade stainless steel.
| Colour | Grey |
|---|---|
| Model Part Number | FPKFW840 |
| Brand | Forgefix |
They are bright zinc plated, which offers good resistance to oxidation in sheltered or interior environments, but they are not recommended for direct, heavy-duty marine or highly corrosive outdoor exposure.
The 40mm measurement refers to the outer diameter of the flat washer, providing a wide surface area for load distribution.
While it might fit physically, it is not recommended. Always use washers that match the specified metric bolt size (M8) for proper structural alignment.
The zinc coating corrodes preferentially to the underlying steel, providing a protective barrier that maintains the strength of the washer even as it weathers.
This specific variant (MPN: FPKFW840) comes in a pack of 6.
Verify the bolt diameter matches the M8 specification; if the thread is damaged, use a file to clear debris before seating the washer.
Ensure the washer is seated flat; if the underlying material is soft, consider using a secondary locking washer if vibration is excessive.
To install, simply slide the washer over the M8 bolt shank before threading the bolt through your material and attaching the nut. Ensure the surface is clean of debris to allow the washer to sit flush against the material. To maintain the integrity of the zinc coating, avoid using heavy-duty abrasive tools for installation. If the washers are exposed to excessive moisture, periodically check for signs of white oxidation, which indicates the sacrificial zinc is working as designed. If red rust appears, replace the washer to maintain joint strength.
