S-91455A510 21 mm ID x 37 mm OD DIN 125; ISO 7089 General Purpose Washers

Key Features & Benefits at a Glance

• Superior corrosion protection with zinc-flake coating that extends service life in harsh industrial environments
• Precise dimensional accuracy with 21mm ID and 37mm OD ensuring perfect fit for M20 screw applications
• Exceptional mechanical strength with Rockwell B91 hardness providing reliable load distribution and vibration resistance
• International standard compliance meeting both DIN 125 and ISO 7089 specifications for global project compatibility
• Environmental regulation adherence with RoHS 3 and REACH compliance for responsible manufacturing
• Optimized thickness design (2.7-3.3mm) balancing material efficiency with structural integrity
• Enhanced durability through zinc-flake coated steel construction resisting wear in demanding applications

Professional Applications & Engineering Value

This M20 flat washer delivers critical engineering solutions where corrosion resistance and dimensional precision are paramount. The zinc-flake coated steel construction provides exceptional protection against environmental degradation, making it ideal for outdoor equipment, automotive assemblies, and industrial machinery exposed to moisture and chemicals. Its compliance with both DIN 125 and ISO 7089 standards ensures reliable performance in international projects, while the precise 21mm internal diameter and 37mm external diameter prevent fastener loosening under vibration and dynamic loads. The Rockwell B91 hardness maintains shape integrity under high clamping forces, solving common issues of washer deformation in heavy-duty bolted connections across construction, manufacturing, and mechanical engineering applications.

Specification Summary & Compliance

Manufactured to exact metric system dimensions with 21mm ID, 37mm OD, and thickness range of 2.7-3.3mm. Engineered to meet DIN 125 and ISO 7089 standards for dimensional accuracy and performance. Constructed from zinc-flake coated steel with Rockwell B91 hardness rating. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.