S-90483A172 21 mm ID x 37 mm OD DIN 125; ISO 7089 General Purpose Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc yellow-chromate plating, extending service life in harsh industrial environments.
• Excellent load distribution due to Rockwell C38 hardness, preventing surface damage and maintaining joint integrity.
• Precise dimensional fit with 21mm ID and 37mm OD, ensuring compatibility with M20 screws and reducing assembly errors.
• Reliable performance under heavy loads, thanks to the durable steel material and 2.7-3.3mm thickness.
• Global compliance assurance with DIN 125 and ISO 7089 standards, facilitating use in international projects.
• Environmental and safety adherence through RoHS 3 and REACH compliance, minimizing regulatory risks.
• Cost-effective maintenance by reducing wear on connected components, lowering long-term operational costs.

Professional Applications & Engineering Value

This M20 flat washer is engineered to address common industrial challenges such as joint loosening, corrosion-induced failures, and uneven load distribution. Constructed from zinc yellow-chromate plated steel, it provides a robust barrier against moisture and chemicals, making it ideal for demanding applications in automotive, machinery, and construction sectors. The metric dimensions (21mm ID, 37mm OD) and adherence to DIN 125 and ISO 7089 standards ensure precise fit and reliable performance in high-vibration environments. By offering consistent hardness and durability, this washer minimizes downtime and enhances the longevity of industrial assemblies, supporting efficient and safe operations.

Specification Summary & Compliance

This flat washer features an inner diameter of 21mm, outer diameter of 37mm, and thickness range of 2.7-3.3mm, designed for M20 screw sizes with standard metric tolerances. It complies with DIN 125 and ISO 7089 specifications, ensuring dimensional accuracy and interchangeability. The product is manufactured from steel with a Rockwell C38 hardness and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) requirements, confirming its suitability for environmentally conscious and regulated industrial use.