S-97310A122 21 mm ID x 44 mm OD DIN 7349 Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in harsh industrial environments.
• Exceptional load distribution due to precise 44mm OD and 21mm ID, reducing stress on fastened components.
• Enhanced durability from Rockwell B76 hardness, ensuring reliable performance under heavy mechanical loads.
• Guaranteed dimensional accuracy with compliance to DIN 7349 standards, providing consistent fit for M20 screw applications.
• Environmental responsibility with RoHS 3 and REACH compliance, meeting strict regulatory requirements for safe usage.
• Versatile thickness range of 7.0-9.0mm, accommodating various assembly needs and tolerances.
• Cost-effective maintenance through long-lasting material quality, minimizing replacement frequency in industrial settings.

Professional Applications & Engineering Value

This M20 zinc-plated steel flat washer is engineered to address common industrial fastening challenges, such as component loosening and corrosion-induced failures. The zinc plating provides a protective barrier against moisture and chemicals, making it ideal for outdoor machinery, automotive assemblies, and construction equipment. Its metric dimensions and adherence to DIN 7349 ensure precise alignment and uniform pressure distribution, preventing bolt fatigue and joint failure. By combining Rockwell B76 hardness with a robust thickness range, this washer delivers reliable performance in heavy-duty applications, from manufacturing plants to infrastructure projects, where consistent corrosion resistance and mechanical integrity are critical for operational safety and efficiency.

Specification Summary & Compliance

This flat washer features precise metric dimensions with an inner diameter of 21mm, outer diameter of 44mm, and thickness ranging from 7.0 to 9.0mm, designed for M20 screw sizes. It conforms to DIN 7349 standards for dimensional accuracy and manufacturing quality. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and adherence to global chemical management requirements.