Product Description
M8 A4 marine-grade stainless steel flat penny repair washers, available with 25mm and 30mm external diameters.
These non-standard large-diameter flat washers provide a much wider bearing surface than conventional M8 flat washers. They help spread clamping loads across a larger area and are suitable for securing thin sheet materials, reinforcing mounting points and covering enlarged, worn or damaged holes.
- Nominal fastener size: M8
- Internal diameter: Approximately 8mm
- Available external diameters: 25mm and 30mm
- Thickness: Approximately 1.5mm
- Material: A4 marine-grade stainless steel
- Finish: Natural stainless steel
- Washer style: Flat penny repair washer
- Manufacturing standard: Non-standard / no DIN number stated
- Alternative names: Repair washer, penny washer, mudguard washer, fender washer and large-diameter flat washer
- Pack sizes available: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 50, 100, 250, 500 and 1000
M8 penny repair washers are commonly used for marine fittings, boat equipment, automotive bodywork, panels, brackets, roofing, cladding, fabrication, machinery, trailers and general maintenance applications.
The enlarged outside diameter spreads the load from an M8 bolt, screw or nut over a wider area than a standard flat washer. This can help reduce localised pressure and lower the risk of a fastener pulling through thin, soft or weakened material.
The 25mm external-diameter washer provides a compact enlarged bearing surface. The larger 30mm option provides additional coverage where a wider load-spreading area or increased coverage of an enlarged mounting hole is required.
The oversized washer design can also help bridge mounting holes that have become worn, distorted or damaged, making these washers useful for repair and reinforcement work.
A4 stainless steel provides improved resistance to corrosion compared with general-purpose A2 stainless steel, particularly in outdoor, coastal, marine and salt-laden environments. It is commonly selected for boats, coastal structures, exterior fittings and other applications exposed to moisture or salt.
Use with a compatible M8 fastener where the washer hole and manufacturing tolerance provide suitable clearance. The washer should sit flat against the mating surface and be adequately supported across its full bearing area.
| A | B | C |
| 8mm | 25mm | 1.5mm |
| 8mm | 30mm | 1.5mm |
Please Note: Specifications given are intended as a guide only. If critical to your project please check with us first.
