DIN 134 and DIN 9021 stainless steel SUS304 M10 large plain flat washers are oversized circular washers designed to provide an even greater load distribution area compared to standard flat washers. Specifically, the M10 designation refers to their compatibility with M10 threaded fasteners. These washers are made from SUS304 stainless steel, offering robust corrosion resistance suitable for a wide range of general-purpose applications.

Definition

DIN 134 and DIN 9021 are standards for large plain flat washers, characterized by a significantly larger outer diameter relative to the inner diameter of the fastener. An “M10” washer is designed for use with an M10 bolt or screw. When made from SUS304 (equivalent to AISI 304 or A2) stainless steel, these washers provide good general corrosion resistance. Their primary function is to distribute the load of a fastener over a much wider surface area, protecting the material and providing greater stability, particularly in applications involving softer materials or larger holes.

Advantages

• Enhanced Load Distribution: The larger surface area distributes the fastener’s load more effectively, significantly reducing pressure on the fastened material and preventing damage.
• Improved Surface Protection: Provides superior protection against the fastener head or nut embedding into soft or delicate surfaces.
• Increased Stability: Offers a more stable bearing surface for fasteners, which can be crucial in dynamic or vibrating applications.
• Accommodates Larger Holes: Ideal for bridging oversized or irregular holes in components, ensuring the fastener still has a secure base.
• Good Corrosion Resistance (SUS304): SUS304 stainless steel offers excellent resistance to atmospheric corrosion and many chemicals, suitable for both indoor and many outdoor applications.
• Standardized Dimensions: Conforms to DIN 134 and DIN 9021 standards, ensuring dimensional consistency and compatibility.
• Prevents Pull-Through: Especially effective in preventing fasteners from pulling through softer materials like wood or plastic.

Applications

• Construction and Structural Applications: Used where significant load distribution is required to prevent material damage, such as in timber structures or sheet metal work.
• HVAC and Ductwork: Provides a large bearing surface for fasteners used in assembling and mounting ventilation systems.
• Marine (Freshwater) and General Outdoor Use: SUS304 offers sufficient corrosion resistance for many outdoor and freshwater marine environments.
• Automotive and Machinery: Used in assemblies where vibration damping and secure fastening on potentially softer materials are needed.
• Woodworking and Furniture: Prevents fasteners from marring or pulling through wood or composite materials, especially when a strong clamping force is applied.
• Plastic and Composite Assemblies: Protects delicate or easily damaged plastic and composite surfaces from fastener pressure.
• Signage and Fixture Mounting: Provides broad support when mounting signs or fixtures to various surfaces.