M5 Stainless Steel Wide Flat Washer DIN 9021 A4

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Description

The DIN 9021 A4 M5 stainless steel wide flat washer is a large-diameter metric washer designed to distribute load over a greater surface area and protect materials from surface damage under nuts or bolt heads. Made from A4 (AISI 316) stainless steel, this washer offers excellent corrosion resistance — especially suited for outdoor, marine and aggressive environments. Wide flat washers are commonly used in assemblies where the joint material may be soft or thin, and a greater bearing area is required to prevent pull-through or deformation. These washers improve joint stability and extend the life of structural and mechanical connections.

Technical Specifications — DIN 9021 A4 M5

  • Standard: DIN 9021 (wide flat washer)
  • Thread size (d): M5
  • Material: A4 stainless steel (AISI 316)
  • Internal diameter (d1): ~5.3 mm
  • Outer diameter (d2): ~15 mm
  • Thickness (h): ~1.2 mm
  • Feature: Large surface area for improved load distribution and material protection
  • Applications: Metalwork, machinery assemblies, panels, frames, marine, outdoor and general fastening where enhanced bearing area is needed

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