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Diyuk Flat Washers - M3

Diyuk Flat Washers - M3

Engineered for the most demanding environments, these Form A flat washers are manufactured from pr...

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B&Q - A4 Marine Grade Stainless Steel Flat Washers (Din 125 Iso 7089)M8Pack Of 1

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B&QB&Q - A4 Marine Grade Stainless Steel Flat Washers (Din 125 Iso 7089)M8Pack Of 1
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Product Information

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The Diyuk M3 Flat Washers are precision-engineered for professionals and DIY enthusiasts working in harsh environments who require reliable load distribution and long-term fastener stability. Crafted from A4 (316) marine-grade stainless steel, these washers offer exceptional resistance to corrosion, pitting, and chlorides, making them ideal for coastal or chemical settings. While they provide superior durability, they are specifically Form A washers, meaning they offer a standard diameter and may not be suitable for applications requiring extra-wide load surface coverage.

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BrandDiyuk

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FAQs

What does Form A mean for these washers?

Form A denotes the specific outer diameter and thickness dimensions as defined by the DIN 125 standard, resulting in a standard-width washer.

Are these suitable for use in saltwater?

Yes, A4 (316) stainless steel is specifically formulated for high resistance to chloride-based corrosion found in marine environments.

What is the hardness of these washers?

These washers have a 200HV hardness rating, which helps them maintain their shape under pressure.

Can I use these with non-stainless bolts?

It is generally recommended to use stainless steel washers with matching stainless steel bolts to avoid galvanic corrosion.

Do these conform to ISO standards?

Yes, they are manufactured to comply with ISO 7089 standards.

Are they magnetic?

A4 (316) stainless steel is typically non-magnetic or very weakly magnetic, which is normal for this grade.

Troubleshooting

Washer appears to be binding during installation

Check that the fastener threads are clean and free of debris; use a small amount of anti-seize lubricant if threads are tight.

Washer is crushing into the mounting surface

The M3 Form A washer has a standard surface area; if the substrate is very soft (e.g., plastic or soft wood), consider adding a wider fender washer to increase load distribution.

Pros and Cons

Pros

  • High-grade 316 stainless steel prevents rust in salty environments
  • Standardized dimensions conform to DIN 125 and ISO 7089
  • Resistant to surface deformation due to 200HV hardness
  • Excellent for applications involving chemical exposure

Cons

  • Form A dimensions may not provide enough surface area for soft materials
  • Higher cost than standard 304 stainless steel alternatives
  • Limited to M3 size specifications

Setup, Compatibility & Care

When installing these washers, ensure you are pairing them with M3-sized fasteners and matching the material grade where possible to prevent galvanic corrosion between dissimilar metals. Always place the washer on the side of the assembly that will experience the most friction during the tightening process. While these washers are highly resistant to corrosion, they should be kept clean of debris and industrial dust to maintain their finish. If working in extremely high-salinity areas, a periodic rinse with fresh water will help preserve the appearance and performance of the stainless steel surface.

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