🛡️ A2 Stainless Steel Penny Repair Washers – Large OD Flat Washers for M4 to M12 Bolts
🏷️ Brand: HomeDIYer Fastener | DIN126 | A2-70
📌 Overview — Fix oversized holes, reinforce thin materials, and stop pull-through. Ever tried to bolt through a rusted panel or a worn-out mounting hole? Standard washers just don’t cut it. Our A2 Stainless Steel Penny Washers (also known as repair or mudguard washers) feature an extra-large outer diameter to distribute load over a wider area. Whether you’re repairing boat decks, mending farm equipment, installing automotive trim, or reinforcing plastic/composite parts, these washers provide the strength and coverage you need. Made from corrosion-resistant A2-70 stainless steel, they last outdoors and resist rust. Choose from multiple outer diameter options per thread size — perfect for DIY repairs, marine projects, and industrial maintenance.
✨ Key Features of A2 Stainless Steel Penny Repair Washers
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Extra-Large Outer Diameter (Penny Style) – Covers elongated or damaged holes, prevents fastener pull-through in soft materials like wood, plastic, or fiberglass.
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A2-70 Stainless Steel (304 equivalent) – Excellent corrosion resistance for marine, coastal, and outdoor applications. No red rust or staining.
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Multiple OD Options per Size – From M4 to M12, choose the exact outer diameter that fits your repair or assembly (e.g., 12mm up to 40mm+).
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DIN126 Standard Flat Washer Profile – Precision punched, smooth edges, and consistent thickness for reliable clamping force.
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Also known as Mudguard / Fender Washers – Trusted by mechanics and bodywork specialists for spreading load under bolt heads or nuts.
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Untreated Natural Finish – No coatings to chip or peel; the stainless surface stays clean and professional.
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Pick Your Quantity – “As per Your Choice” packaging: order exactly what you need, no forced mixed packs.
📏 Technical Specifications – Penny Flat Washers (DIN126, Metric)
| Thread Size (Bolt/Screw) |
Internal Diameter (mm) |
Thickness (mm) |
Outer Diameter Options (mm) |
| M4 |
4.0 |
1.0 |
12, 15, 20 |
| M5 |
5.0 |
1.2 |
15, 20, 25, 30 |
| M6 |
6.0 |
1.2 (for OD20) |
20 |
| 1.5 (for OD25,30,40) |
25, 30, 40 |
| M8 |
8.0 |
1.5 (for OD20,25,30,40) |
20, 25, 30, 40 |
| 2.0 (for OD35) |
35 |
| M10 |
10.0 |
1.5 |
25, 30, 40 |
| M12* |
12.0 |
1.8 (typical) |
30, 40, 50 (available upon request) |
💡 Important notes: “Penny washers” are also called repair or mudguard washers. The large OD helps bridge corroded or oversized holes.
* M12 dimensions are based on common industry practice; for exact dimensions or custom sizes, please contact us before ordering.
✅ Packaging: Sold as per your choice – select thread size, outer diameter, and quantity. All washers are A2 stainless, untreated.
🧲 Why A2-70 Stainless? – High resistance to rust, salt spray, and chemicals. Ideal for boat trailers, outdoor signs, roof repairs, and any damp environment.
❓ Frequently Asked Questions – Penny Repair Washers
What’s the difference between a penny washer and a regular flat washer?
🔄 A penny washer (or repair washer) has a much larger outer diameter compared to a standard flat washer of the same bolt size. This extra surface area spreads the clamping load over a wider area, making it perfect for covering enlarged, rusted, or damaged holes, and for soft materials like plastic, wood, or fiberglass, where a small washer would pull through.
Can I use these stainless washers outdoors or in saltwater environments?
🌊 Yes! A2-70 stainless steel (304 grade) offers excellent corrosion resistance in outdoor, coastal, and freshwater marine environments. While not as salt-resistant as A4 (316) stainless, A2 is perfectly suitable for most outdoor repairs, automotive underbody, and general marine use. Rinse after heavy salt exposure to maximize life.
How do I choose the right outer diameter for my repair?
📏 Measure the damaged hole or the area you need to cover. The washer’s OD should be at least 1.5–2x the hole diameter for a secure bridge. For soft materials, go with the largest OD that fits your space. Our options range from 12mm (for M4) up to 50mm (for M12). When in doubt, choose a larger OD for maximum load distribution.
Do you sell mixed packs of different sizes?
📦 No, we do not sell mixed packs unless specifically requested. Our “Package Included: As per Your Choice” means you order exactly the size (thread diameter), outer diameter, and quantity you need. This keeps your inventory clean and avoids waste. Contact us for custom assortments if required.
Are these washers suitable for use with stainless bolts to prevent galvanic corrosion?
⚡ Yes. Using A2 stainless washers with A2 stainless bolts (or other compatible metals) avoids galvanic corrosion. They are ideal for matching fastener systems. Avoid pairing with plain steel or aluminum directly unless insulated, but the washer itself will not accelerate corrosion.
⚙️ HomeDIYer Fastener – Professional-grade stainless hardware for repairs, restoration, and fabrication. Order your exact penny washers today.
