S-98687A326 21 mm ID x 34 mm OD DIN 433 General Purpose Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from the black oxide steel finish, extending service life in humid or harsh industrial settings
• Precise dimensional fit with 21mm ID and 34mm OD, ensuring secure seating and even load distribution for M20 screws
• Consistent thickness tolerance (2.7-3.3mm) for reliable gasketing and vibration resistance in assembled components
• DIN 433 compliance guarantees interchangeability and mechanical reliability across European-standard machinery and equipment
• RoHS 3 & REACH environmental compliance eliminates hazardous substances, meeting global supply chain sustainability requirements
• Optimized for high-stress applications where flat bearing surfaces prevent fastener loosening and surface damage

Professional Applications & Engineering Value

Engineered for demanding industrial environments, this metric flat washer solves common assembly challenges like uneven load distribution and galvanic corrosion. The black oxide steel construction provides a durable, mildly corrosion-resistant barrier without altering dimensional tolerances—critical for maintaining DIN 433 specifications in automotive subassemblies, heavy machinery, and structural steel frameworks. Its 21mm ID/34mm OD configuration ensures full contact with M20 screw heads and mating surfaces, reducing stress concentration and preventing joint failure under dynamic loads. By combining standardized dimensions with environmentally compliant steel material, this washer delivers long-term reliability while simplifying procurement for OEMs and MRO operations.

Specification Summary & Compliance

This flat washer adheres to DIN 433 dimensional standards with an internal diameter of 21mm, outer diameter of 34mm, and thickness range of 2.7-3.3mm. Manufactured from black oxide steel, it is designed for use with M20 screw applications. The product fully complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring unrestricted use in international industrial markets.