Stainless Steel A4 Metric Washers Form A DIN-125A (Pack of 10)
Stainless Steel A4 Metric Washers Form A DIN-125A (Pack of 10) - M3 is backordered and will ship as soon as it is back in stock.
The Metric Form A DIN-125A A4 (316) Stainless Steel Flat Washers provide the highest level of corrosion resistance available for standard metric fasteners. Supplied in convenient packs of 10, these premium marine-grade washers are essential for boat building, coastal construction, and challenging environments where standard stainless steel would eventually fail, ensuring absolute structural integrity under extreme conditions.
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Form A (DIN 125A) Washer Size Chart
| Nominal Size | Internal Diameter (d1 min) [mm] | External Diameter (d2 max) [mm] | Thickness (s) [mm] |
|---|---|---|---|
| M2 | 2.2 | 5.0 | 0.3 |
| M2.5 | 2.7 | 6.0 | 0.5 |
| M3 | 3.2 | 7.0 | 0.5 |
| M3.5 | 3.7 | 8.0 | 0.5 |
| M4 | 4.3 | 9.0 | 0.8 |
| M5 | 5.3 | 10.0 | 1.0 |
| M6 | 6.4 | 12.0 | 1.6 |
| M7 | 7.4 | 14.0 | 1.6 |
| M8 | 8.4 | 16.0 | 1.6 |
| M10 | 10.5 | 20.0 | 2.0 |
| M12 | 13.0 | 24.0 | 2.5 |
| M14 | 15.0 | 28.0 | 2.5 |
| M16 | 17.0 | 30.0 | 3.0 |
| M18 | 19.0 | 34.0 | 3.0 |
| M20 | 21.0 | 37.0 | 3.0 |
| M22 | 23.0 | 39.0 | 3.0 |
| M24 | 25.0 | 44.0 | 4.0 |
| M27 | 28.0 | 50.0 | 4.0 |
| M30 | 31.0 | 56.0 | 4.0 |
| M33 | 34.0 | 60.0 | 5.0 |
| M36 | 37.0 | 66.0 | 5.0 |
| M39 | 40.0 | 72.0 | 6.0 |
| M42 | 43.0 | 78.0 | 7.0 |
Stainless Steel A4 Metric Washers Form A DIN-125A (Pack of 10) - M3 is backordered and will ship as soon as it is back in stock.
Description
Description
Extreme A4 (316) Corrosion Resistance
While A2 stainless steel is great for standard outdoor use, prolonged exposure to saltwater, chlorides, or industrial chemicals will cause it to tarnish and pit.
A4 (316 grade) stainless steel contains added molybdenum. This specific alloy addition gives you the practical advantage of a washer that fiercely resists chloride-induced corrosion, making it completely safe for permanent submersion in marine environments or exposure to harsh cleaning chemicals.
Flawless Architectural & Marine Finish
When hardware fails in a marine or luxury outdoor environment, it bleeds rust down the face of expensive fibreglass, high end timber, or decorative glass.
Because A4 stainless steel provides an impenetrable barrier against severe oxidation, these washers maintain a clean, polished silver appearance indefinitely. This ensures your boat restorations, coastal decking, and swimming pool enclosures continue to look immaculate long after the installation is complete.
Essential Load Distribution
Driving a high-torque bolt directly into exterior decking, fibreglass hulls, or metal fabrications focuses all the pressure onto a very small area, which can easily crush or crack the substrate.
These Form A washers instantly increase the bearing surface area. This evenly distributes the clamping force from the nut or bolt head, giving you a much stronger, more stable joint that stands up to heavy wind, wave impacts, or dynamic structural loads.
Standardized Form A Precision
Mismatched hardware can lead to uneven clamping, which is dangerous in high-stakes coastal or marine structural builds.
Manufactured to exact DIN 125A specifications, these Form A washers feature a highly standardized thickness and outside diameter. This ensures a perfect, flush fit with standard metric A4 bolts and machine screws, guaranteeing reliable and predictable performance across all your heavy duty assemblies.
Key Features
- Manufactured from premium A4 (316) marine-grade stainless steel.
- Conforms strictly to DIN-125A Form A metric specifications.
- Contains molybdenum for unparalleled resistance to pitting and chlorides.
- Standard thickness and outer diameter for everyday structural applications.
- Prevents rust-bleed staining on fibreglass, masonry, and architectural timber.
- Supplied in a handy, project-ready pack of 10 washers.
Specifications
Specifications
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Washer Form
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Material
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Finish
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Colour
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What's in the box?
What's in the box?
Ultimate rust resistance.
Essential load distribution.
Frequently Asked Questions
What is the exact difference between A2 and A4 stainless steel?
What is the exact difference between A2 and A4 stainless steel?
While both are highly rust-resistant, A4 (316) stainless steel contains an addition of molybdenum. This specific element drastically increases the metal's resistance to "pitting" caused by chlorides. If you are near the sea, using salt on roads, or in a swimming pool environment, A2 will eventually tarnish and rust, whereas A4 will survive indefinitely.
Can I use these A4 washers with A2 stainless steel bolts?
Can I use these A4 washers with A2 stainless steel bolts?
Technically yes, but it defeats the purpose. In a highly corrosive environment, the A2 bolt will begin to rust and fail long before the A4 washer does. For absolute structural integrity and to avoid any galvanic reaction, always match A4 washers with A4 bolts and nuts.
Are A4 stainless washers completely non-magnetic?
Are A4 stainless washers completely non-magnetic?
Yes, A4 stainless steel has an austenitic microstructure, which makes it inherently non-magnetic. It is generally even less susceptible to trace magnetism from manufacturing processes (like cold-working) than A2 stainless steel, making it excellent for sensitive electronic or compass-adjacent marine installations.
Shipping
What countries do you ship to?
What countries do you ship to?
We currently only ship to the UK. To enquire about shipping to a different destination, please contact us.
How long will it take to receive my order?
How long will it take to receive my order?
Shipping normally takes 1 - 2 days. Orders placed before 2:00pm will be shipped same day. Orders placed after 2:00pm on Fridays will be shipped the following Monday.
