Flat Washers DIN 125 / ISO 7089 Form A - A4 (316) Marine Grade Stainless Steel - Metric Sizes M1.6 to M30

Ultimate Corrosion Resistance and Joint Security for Demanding Environments

Engineered for uncompromising performance in the most severe conditions, our Form A Flat Washers provide superior load distribution and unparalleled corrosion resistance. Manufactured from premium A4 (316) marine grade stainless steel and conforming to the precise dimensional standards of DIN 125 A / ISO 7089, these washers are the definitive choice for critical applications where long-term reliability is paramount.

The key to their performance lies in the A4 (316) stainless steel composition, which includes 2-3% molybdenum. This crucial element provides exceptional resistance to pitting and crevice corrosion caused by chlorides found in saltwater, de-icing salts, and harsh industrial chemicals. Unlike standard A2 (304) stainless steel, our A4 marine grade washers ensure lasting integrity and a stain-free finish in marine, coastal, and chemical processing environments.

Furthermore, these washers are manufactured to the 200HV hardness class specified by ISO 7089. This high hardness provides a solid, non-deforming bearing surface that prevents loss of clamp load over time, ensuring your bolted joints remain secure under vibration and operational stress.

Key Features:

• Premium A4 (316) Marine Grade Stainless Steel: Offers the ultimate protection against saltwater, chemicals, and other corrosive agents.

• Dual Standard Compliance: Dimensionally conforms to both DIN 125 Form A and the superseding ISO 7089 standard for universal application.

• High Hardness (200HV): Provides a superior bearing surface that resists deformation and maintains bolt preload for long-term joint security.

• Form A Design: A standard flat washer profile without chamfer for general-purpose use and a flush fit.

• Comprehensive Size Range: Available in metric sizes from M1.6 to M30 to suit a wide variety of bolts and screws.

Strategic Applications:

These high-performance washers are the ideal investment for lowering the total cost of ownership in any application where corrosion can lead to costly maintenance, downtime, or failure.

• Marine & Coastal: Boat building, deck hardware, docks, and coastal construction.

• Industrial Processing: Chemical plants, oil & gas refineries, pharmaceutical manufacturing, and pulp & paper mills.

• Food & Beverage: Commercial kitchens, breweries, dairies, and food processing equipment.

• Infrastructure & Transportation: Bridges, railings, and vehicles exposed to de-icing salts.

• High-Tech & Medical: Applications requiring non-magnetic, chemically inert components.

Technical Specifications