S-98035A211 4.3 mm ID x 12 mm OD DIN 7349 Oversized Washers

Key Features & Benefits at a Glance

• Enhanced corrosion resistance from black-oxide steel surface treatment, extending service life in humid or demanding industrial environments
• Precise dimensional compatibility with M4 screws (4.3mm ID) ensures secure fit and prevents fastener loosening under vibration
• Optimized load distribution through 12mm OD design, reducing surface pressure and preventing material damage
• Consistent thickness control (1.4-1.8mm) provides reliable spacing and clamping performance in assembled components
• Guaranteed manufacturing quality through DIN 7349 compliance, ensuring interchangeability and standardization across European metric systems
• Environmental regulation compliance with RoHS 3 and REACH standards, making them suitable for regulated industries and export markets
• Versatile industrial application across machinery, automotive, and electrical assemblies where corrosion protection and metric standardization are critical

Professional Applications & Engineering Value

These M4 metric flat washers solve critical engineering challenges in industrial fastening systems where corrosion and dimensional instability cause premature failure. The black-oxide steel construction creates a protective magnetite layer that resists oxidation without changing dimensional properties, making them ideal for electrical enclosures, automotive assemblies, and outdoor equipment exposed to moisture. The DIN 7349 standardization ensures perfect compatibility with metric M4 fasteners in European-manufactured machinery, while the precise 4.3mm ID prevents misalignment during automated assembly processes. Engineers specify these washers for applications requiring consistent load distribution across softer materials like aluminum or plastics, where the 12mm OD effectively spreads clamping force to prevent surface deformation.

Specification Summary & Compliance

Manufactured to DIN 7349 dimensional standards with 4.3mm inner diameter, 12mm outer diameter, and 1.4-1.8mm thickness range. The washers maintain standard metric tolerances for consistent performance in M4 fastener applications. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, including the latest SVHC updates, ensures environmental safety and global market acceptance for industrial and consumer products.