S-97310A112 4.3 mm ID x 12 mm OD DIN 7349 Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance through zinc-plated steel construction, extending service life in demanding industrial environments
• Precise dimensional accuracy with 4.3mm ID and 12mm OD ensures perfect fit for M4 screws, preventing installation issues
• Optimized load distribution with 1.4-1.8mm thickness range, reducing surface pressure and preventing material damage
• Enhanced mechanical strength with Rockwell B76 hardness rating, maintaining structural integrity under vibration and stress
• Guaranteed standardization through DIN 7349 compliance, ensuring interchangeability and reliability across applications
• Environmental compliance assurance with RoHS 3 and REACH standards, meeting global regulatory requirements
• Versatile industrial compatibility with metric sizing, suitable for European machinery and equipment manufacturing

Professional Applications & Engineering Value

This zinc-plated steel flat washer delivers exceptional engineering value in industrial fastening systems where corrosion protection and dimensional precision are critical. The M4 metric sizing combined with DIN 7349 standardization ensures reliable performance in automotive assemblies, machinery manufacturing, and electrical enclosures. The zinc plating provides essential galvanic protection against moisture and chemical exposure, while the controlled thickness variation (1.4-1.8mm) accommodates manufacturing tolerances without compromising clamping force distribution. Engineers specify this flat washer for applications requiring consistent performance under vibration, thermal cycling, and mechanical stress, making it ideal for production lines where fastener reliability directly impacts operational uptime and maintenance cycles.

Specification Summary & Compliance

This precision flat washer features 4.3mm inner diameter and 12mm outer diameter with thickness ranging 1.4-1.8mm, manufactured to DIN 7349 dimensional standards. The zinc-plated steel construction achieves Rockwell B76 hardness for mechanical durability. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across international markets. Designed specifically for M4 screw applications in metric fastening systems, this washer maintains consistent performance within specified industrial tolerances.