S-97310A115 8.4 mm ID x 21 mm OD DIN 7349 Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in harsh industrial environments
• Exceptional load distribution with precise 21mm OD and 3.7-4.3mm thickness range to prevent surface damage and joint loosening
• Perfect M8 screw compatibility with 8.4mm inner diameter ensuring secure fit and vibration resistance
• Enhanced mechanical strength from Rockwell B76 hardness rating for reliable performance under heavy loads
• Guaranteed dimensional accuracy through strict DIN 7349 compliance for consistent assembly results
• Environmental compliance assurance meeting RoHS 3 and REACH standards for global supply chain compatibility
• Reduced maintenance requirements through durable zinc plating that resists wear and chemical exposure

Professional Applications & Engineering Value

This M8 zinc-plated steel flat washer delivers critical engineering solutions for industrial assembly challenges. The zinc-plated steel material provides essential corrosion protection in manufacturing facilities, automotive applications, and outdoor equipment where moisture and chemicals are present. With its DIN 7349 certification, this metric flat washer ensures precise dimensional stability that prevents joint failure in high-vibration environments. The optimized 21mm OD and controlled thickness range distribute clamping forces evenly, protecting sensitive surfaces from deformation while maintaining bolt tension. Engineers specify this heavy-duty washer for machinery, structural steel connections, and electrical enclosures where Rockwell B76 hardness provides the necessary strength to withstand dynamic loads without compromising the fastener system's integrity.

Specification Summary & Compliance

This precision flat washer features exact dimensional specifications: 8.4mm inner diameter, 21mm outer diameter, and 3.7-4.3mm thickness range. Manufactured to DIN 7349 standards for dimensional accuracy and performance consistency. The zinc-plated steel construction meets Rockwell B76 hardness requirements for mechanical durability. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, including the latest SVHC updates, ensures global regulatory acceptance for industrial applications.