M4 x 12mm Black Nylon Penny Washers, Pack of 10 – DIN 9021 Form G Wide-Form UV-Stable Insulating Fender Mudguard Washer for Electrical, Automotive, Outdoor & DIY

• HIGH GRADE BLACK NYLON (POLYAMIDE) – UV-STABLE, NON-CONDUCTIVE & CORROSION PROOF Manufactured from high-quality black nylon (polyamide PA6) — electrically non-conductive, naturally non-magnetic, completely immune to rust, and stabilised against UV degradation for prolonged outdoor exposure. Unlike standard white nylon which can yellow and become brittle under sunlight, the black formulation maintains its strength and appearance for years outdoors. Ideal for visible installations where the discreet black finish complements the surrounding hardware.
• DIN 9021 FORM G WIDE-FORM – LARGE 12mm OUTER DIAMETER FOR LOAD SPREADING Manufactured to the DIN 9021 standard with a 4.3mm inner bore and 12mm outer diameter — a wide-form "penny" washer (also called Form G, mudguard, or fender washer). The oversized contact area spreads bolt clamping force across a wide surface, preventing the bolt head from pulling through soft materials like timber, plywood, plastic, panel board, or sheet metal — and protecting paint and delicate surfaces from damage during tightening.
• M4 x 12mm – PACK OF 10 BLACK NYLON PENNY WASHERS Each pack contains 10 individual M4 black nylon penny washers with 4.3mm inner bore, 12mm outer diameter, and 1.0mm thickness. Suitable for outdoor installations exposed to sunlight, electrical isolation between metal parts, automotive bodywork repair on dark vehicles, caravan and motorhome installations, vibration dampening, garden machinery, and any project requiring discreet non-conductive load-spreading washers.
• ELECTRICAL ISOLATION & GALVANIC CORROSION PREVENTION A key advantage over metal washers — nylon prevents electrical conductivity between metal bolt and metal substrate, essential for electrical earthing isolation, panel insulation, and instrument enclosures. Equally valuable for preventing galvanic corrosion when fixing dissimilar metals together (e.g. aluminium panels to steel chassis), where direct metal-to-metal contact would create accelerated corrosion at the joint over time.
• UNIVERSAL M4 FIT – COMPATIBLE WITH ALL STANDARD M4 BOLTS & SCREWS With a precise 4.3mm inner bore, these black nylon penny washers are universally compatible with all M4 metric bolts, machine screws, coach bolts, threaded rod, and wood screws across all major brands and standards. Pairs perfectly with stainless steel, brass, or plated steel hex bolts and machine screws. Available across a full range of sizes from M3 through M12 in 10-pack and 20-pack quantities — also available in white nylon for visible internal applications.

M4 x 12mm Nylon Black Penny Washers Fender Repair Washer Mudguard DIN 9021 ( Pack of 10) [ QUALITY NYLON PENNY WASHERS ] Pack of 10 Nylon washers, these nylon penny washers are to DIN 9021 specification and are compatible with our range of metric machine screws. Nylon washers are strong, lightweight, and resistant to friction. These non-metal washers offer considerable insulation properties and are resistant to corrosion [ M4 x 12mm BLACK NYLON WASHERS ] Made from quality nylon 66 material, black penny washers main task is to spread the load across a wider area which comes useful when dealing with softer materials. Nylon washers also reduce vibration and make it easy to loosen and tighten fastener assemblies. They provide a cost-effective option for spacing and cushioning, and can be used indoors or outdoors [ BLACK PENNY WASHERS ] have a good resistance to chemicals such as most common solvents, oils, greases, petrol, etc [ NYLON PENNY WASHERS] Nylon penny washers, also referred to as fender washers or repair washes, prevent damage to parts and surfaces during tightening and distribute the forces at the joint over a larger surface area. They also reduce vibration and noise to a certain extent. [ PENNY WASHERS SIZES ] Washers inside diameter: 4.3mm, Outside diameter 12mm, Thickness: 1mm.