DIN125 stainless steel A2/A4 metal flat washers are general-purpose circular washers designed to distribute the load of a threaded fastener, prevent damage to the surface, and provide a larger bearing surface. They are manufactured according to the DIN125 standard and are available in two main grades of stainless steel: A2 (304) and A4 (316), offering different levels of corrosion resistance for various applications.

Definition

A DIN125 flat washer is a plain, circular, unhardened washer conforming to the DIN125 standard. It is typically used under the head of a screw or a nut to provide a smooth bearing surface, distribute pressure evenly over a larger area, and prevent loosening of the fastener. Available in stainless steel grades A2 (equivalent to AISI 304) and A4 (equivalent to AISI 316), these washers offer good corrosion resistance, with A4 providing superior resistance to chlorides and other aggressive chemicals due to its molybdenum content.

Advantages

• Load Distribution: Spreads the fastener’s load over a wider area, reducing the risk of damage to the fastened material.
• Surface Protection: Prevents the fastener head or nut from galling or embedding into softer materials.
• Corrosion Resistance (A2): Stainless steel A2 (304) offers good resistance to atmospheric corrosion, making it suitable for many outdoor and general industrial applications.
• Superior Corrosion Resistance (A4): Stainless steel A4 (316) provides enhanced resistance to chlorides, acids, and other corrosive environments, ideal for marine, chemical, and high-salinity applications.
• Enhanced Stability: Provides a flatter, more stable surface for the fastener to bear against.
• Reduced Loosening: Can help prevent fasteners from loosening by providing a consistent bearing surface and acting as a slight spring.
• Standardized Dimensions: Conforms to DIN125 standards, ensuring consistent dimensions and interchangeability.

Applications

• General Fastening: Widely used in almost all types of fastening applications across various industries.
• Construction and Architecture: Essential for structural connections, cladding, and general building applications.
• Automotive Industry: Used in various assemblies where load distribution and surface protection are critical.
• Marine Environments (A4): Due to its superior corrosion resistance, A4 stainless steel washers are ideal for boats, docks, and coastal structures.
• Chemical and Pharmaceutical Industries (A4): Suitable for equipment and infrastructure exposed to corrosive chemicals.
• Food Processing Equipment (A4): Often used in environments requiring high hygiene and resistance to cleaning agents.
• Woodworking: Prevents screws and bolts from sinking into soft woods.