S-98035A110 21 mm ID x 35 mm OD Oversized Washers

Key Features & Benefits at a Glance

• Exceptional corrosion resistance through black-oxide steel surface treatment, extending service life in demanding environments
• Precise dimensional compatibility with M20 screws (21mm ID × 35mm OD) ensures perfect fit and optimal load distribution
• Enhanced durability with Rockwell 15N80 hardness rating, maintaining structural integrity under heavy loads
• Superior load-bearing capacity with 3.0-3.9mm thickness, providing reliable performance in heavy-duty applications
• Environmental compliance assurance meeting RoHS 3 and REACH standards for safe industrial usage
• Metric system standardization ensures seamless integration with international equipment and machinery
• Reduced maintenance requirements through durable steel construction and protective surface coating

Professional Applications & Engineering Value

This M20 flat washer delivers critical engineering value in industrial fastening systems where corrosion resistance and dimensional precision are paramount. The black-oxide steel construction provides superior protection against environmental degradation, making it ideal for machinery assembly, structural steel connections, and outdoor equipment where moisture and chemical exposure are concerns. With its 21mm ID and 35mm OD dimensions specifically engineered for M20 screw applications, this metric flat washer ensures uniform load distribution, preventing joint loosening and material deformation. The 3.0-3.9mm thickness range offers optimal compression characteristics for heavy-duty applications in construction, automotive, and manufacturing sectors, while the Rockwell 15N80 hardness guarantees long-term performance reliability under sustained mechanical stress.

Specification Summary & Compliance

This flat washer features precision metric dimensions with 21mm internal diameter, 35mm external diameter, and 3.0-3.9mm thickness range, engineered for M20 screw compatibility. Manufactured from black-oxide steel with Rockwell 15N80 hardness rating, the product maintains dimensional accuracy for reliable performance. Compliance includes RoHS 3 (2015/863/EU) with exemption 6(a) for lead as an alloying element in steel, and full adherence to REACH (EC 1907/2006) standards as of January 17, 2023, including 233 SVHC substances, ensuring environmental responsibility and workplace safety.