Penny Washers DIN 9021 Form G Bright Zinc Plated Steel Large Repair Mudguard Fender Washers M4 to M30

Penny Washers DIN 9021 Form G Bright Zinc Plated Steel Large Repair Mudguard Fender Washers M4 to M30 Description

Achieve a secure, professional finish on every fixing with our heavy-duty Penny Washers, manufactured to the DIN 9021 standard (dimensions and tolerances now carried under EN ISO 7093-1) from high-tensile steel and finished with a bright zinc plating (BZP) for durable corrosion resistance.

Also known as fender washers, mudguard washers or repair washers, their defining feature is an extra-large outer diameter - the largest of the standard washer forms, known as Form G - designed to spread the clamping load of a screw or bolt over a much wider surface area than a standard flat washer. This makes them an essential component wherever a fastener needs to be stopped from digging into, cracking or pulling through a soft or worn material, from timber and plasterboard through to bodywork panels and worn or oversized fixing holes.

Available across 12 sizes from M4 up to M30, with piece weights ranging from around 1g (0.04oz) for the smallest M4 washer up to roughly 273g (9.6oz) for the largest M30 washer, there is a size to suit fixings from light joinery right through to heavy structural and automotive work.

Key Features

• Extra-large Form G diameter: the largest of the standard washer forms, spreading the clamping load over a much wider area than a standard flat washer and reducing the risk of the fastener head crushing, cracking or pulling through the material beneath.
• Manufactured to DIN 9021: dimensions and tolerances now carried under the equivalent EN ISO 7093-1 standard, guaranteeing a consistent, repeatable fit size after size.
• High-tensile steel construction: gives the washer the strength to bear load without deforming or flattening under a tightened fastener.
• Bright zinc plated (BZP) finish: a sacrificial protective coating that resists everyday moisture and oxidation, suited to indoor use and general-purpose outdoor applications.
• 12 sizes from M4 to M30: a genuinely wide range, so the correct washer is available whether the job calls for a small fixing or a substantial structural bolt.
• Wide weight range: from around 1g (0.04oz) for an M4 washer up to roughly 273g (9.6oz) for an M30, reflecting the increase in bearing area and material across the range.
• Imperial equivalents included: every metric dimension in the specification list below is shown alongside its inch equivalent for quick reference.

Typical Applications

The large bearing surface and wide size range make these washers useful wherever a standard flat washer would be too small to properly spread the load of a fastener:

• Woodworking & carpentry: decking, fencing and timber-frame construction, where the wide bearing face helps stop a screw or bolt head sinking into or splitting softwood, plus general joinery work where load needs spreading across a wider area of timber.
• Automotive & bodywork: body panels, fenders, bumpers and interior trim fittings, where thin sheet metal benefits from the extra bearing area to stop a fastener pulling through.
• DIY & home repair: flat-pack furniture assembly, shelf and bracket mounting, and covering oversized, worn or damaged fixing holes where a standard washer would no longer bridge the gap.
• Plumbing & electrical: securing fixtures and fittings where a wider load-bearing footprint is needed to stop the fixing damaging the surrounding material.
• Plasterboard & soft-material fixing: the extra-large diameter helps prevent the fastener head crushing through plasterboard or similarly soft sheet material, giving a cleaner, more secure finish.

Specification

The list below gives the nominal dimensions for every size in the range, taken from the DIN 9021 standard. Metric figures are shown first, with the imperial equivalent in brackets.

• Size M4 - Suits Bolt/Screw Ø: 4mm (0.16in); Inner Ø (d1): 4.3mm (0.17in); Outer Ø (d2): 12mm (0.47in); Thickness (h): 1.0mm (0.04in)
• Size M5 - Suits Bolt/Screw Ø: 5mm (0.20in); Inner Ø (d1): 5.3mm (0.21in); Outer Ø (d2): 15mm (0.59in); Thickness (h): 1.2mm (0.05in)
• Size M6 - Suits Bolt/Screw Ø: 6mm (0.24in); Inner Ø (d1): 6.4mm (0.25in); Outer Ø (d2): 18mm (0.71in); Thickness (h): 1.6mm (0.06in)
• Size M8 - Suits Bolt/Screw Ø: 8mm (0.31in); Inner Ø (d1): 8.4mm (0.33in); Outer Ø (d2): 24mm (0.94in); Thickness (h): 2.0mm (0.08in)
• Size M10 - Suits Bolt/Screw Ø: 10mm (0.39in); Inner Ø (d1): 10.5mm (0.41in); Outer Ø (d2): 30mm (1.18in); Thickness (h): 2.5mm (0.10in)
• Size M12 - Suits Bolt/Screw Ø: 12mm (0.47in); Inner Ø (d1): 13.0mm (0.51in); Outer Ø (d2): 37mm (1.46in); Thickness (h): 3.0mm (0.12in)
• Size M14 - Suits Bolt/Screw Ø: 14mm (0.55in); Inner Ø (d1): 15.0mm (0.59in); Outer Ø (d2): 44mm (1.73in); Thickness (h): 3.0mm (0.12in)
• Size M16 - Suits Bolt/Screw Ø: 16mm (0.63in); Inner Ø (d1): 17.0mm (0.67in); Outer Ø (d2): 50mm (1.97in); Thickness (h): 3.0mm (0.12in)
• Size M18 - Suits Bolt/Screw Ø: 18mm (0.71in); Inner Ø (d1): 20.0mm (0.79in); Outer Ø (d2): 56mm (2.20in); Thickness (h): 4.0mm (0.16in)
• Size M20 - Suits Bolt/Screw Ø: 20mm (0.79in); Inner Ø (d1): 22.0mm (0.87in); Outer Ø (d2): 60mm (2.36in); Thickness (h): 4.0mm (0.16in)
• Size M24 - Suits Bolt/Screw Ø: 24mm (0.94in); Inner Ø (d1): 26.0mm (1.02in); Outer Ø (d2): 72mm (2.83in); Thickness (h): 5.0mm (0.20in)
• Size M30 - Suits Bolt/Screw Ø: 30mm (1.18in); Inner Ø (d1): 33.0mm (1.30in); Outer Ø (d2): 92mm (3.62in); Thickness (h): 6.0mm (0.24in)

Standard: DIN 9021 (EN ISO 7093-1 equivalent)
Type: Form G, large outer diameter
Material: Steel
Finish: Bright zinc plated (BZP)
Sizes: M4, M5, M6, M8, M10, M12, M14, M16, M18, M20, M24, M30