M5 x 20 mm Black Penny Washers Stainless Steel Blackened Flat Repair Mudguard Washer (Pack of 20) Sizes From M3 to M10

BLACK PENNY WASHER M5 X 20MM — DIN 9021 FORM G WIDE-FORM Material: A2 stainless steel (304 grade, 18-8). Finish: chemical-black conversion coating, matt black appearance. Specification: DIN 9021 wide-form penny washer with outer diameter several times the nominal thread size. Alternative names: mudguard washer, fender washer, repair washer, timber washer, Form G washer, 3D washer. PACK OF 20 — M5 BLACK PENNY WASHERS FOR MULTI-FIXING PROJECTS Each pack contains 20 individual M5 x 20mm black penny washers with the precise outer diameter specified by DIN 9021. A practical quantity for car body and panel repair, caravan and motorhome maintenance, trailer board fixings, roof rack installations, sun sail and pergola anchors, fence post brackets, and any project requiring multiple wide-surface fixings in a discreet matt black finish. DIN 9021 FORM G WIDE-FORM – LARGE 20mm OUTER DIAMETER FOR LOAD SPREADING Manufactured to the DIN 9021 standard, these are large outer diameter "penny" washers (also known as Form G, wide-form, or fender washers). The oversized 20mm contact area spreads bolt clamping force across a wide surface — preventing the bolt head from pulling through soft materials like wood, plastic, plasterboard, sheet metal, fibreglass, or composite panels. Essential for any fixing into thin or fragile substrates where standard form A washers would cut through. VERSATILE – WOOD, METAL, GARDEN, AUTOMOTIVE & MARINE APPLICATIONS The combination of stainless steel corrosion resistance and decorative black finish makes these washers genuinely multi-purpose. Use them with M5 hex bolts, machine screws, threaded rod, or roofing bolts across exterior timber framing, garden trellis and pergola structures, vehicle bodywork and undercarriage, marine hatch and panel fixings, signage and architectural metalwork, and any DIY or trade project where a black washer outperforms standard zinc-plated alternatives both functionally and visually. UNIVERSAL M5 FIT – COMPATIBLE WITH ALL STANDARD M5 BOLTS, SCREWS & RIVETS With a precise M5 inner bore, these penny washers are universally compatible with all standard M5 metric bolts, machine screws, coach bolts, threaded rod, and rivets across all major brands and standards. Pairs perfectly with A2 304 stainless hex bolts, hex flange bolts, button head socket screws, and dome nuts. Available in a full range of sizes from M3 through M10 in 10-pack and 20-pack quantities — browse our complete black penny washer range to find the exact size and quantity for your project.