S-91100A210 20 mm ID x 56 mm OD DIN 9021 Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc plating that protects against rust and extends service life in demanding industrial environments
• Exceptional load distribution thanks to the 56mm outer diameter, preventing surface damage and maintaining joint integrity under high stress
• Precision fit for M18 screws with 20mm inner diameter ensuring secure fastening and reducing installation errors
• Enhanced durability from Rockwell B56 hardness, providing reliable performance in high-vibration applications
• Industry-standard compliance with DIN 9021 specifications, guaranteeing dimensional accuracy and interchangeability
• Environmental responsibility through RoHS 3 and REACH compliance, meeting strict regulatory requirements for hazardous substances
• Versatile thickness range of 3.4-4.6mm accommodates minor surface variations while maintaining consistent clamping force

Professional Applications & Engineering Value

These M18 zinc-plated steel flat washers deliver critical engineering solutions by addressing common industrial fastening challenges. The zinc-plated steel construction provides excellent corrosion resistance, making them ideal for outdoor equipment, machinery, and automotive applications where moisture exposure is a concern. The DIN 9021 standard ensures precise dimensional control and reliable performance in heavy-duty washers applications. With their optimized 56mm outer diameter, they effectively distribute clamping force over a larger area, preventing surface indentation and maintaining structural integrity in assemblies subjected to dynamic loads. The Rockwell B56 hardness ensures these metric flat washers maintain their shape under pressure, reducing the risk of deformation in high-stress environments while providing consistent performance throughout their service life.

Specification Summary & Compliance

This flat washer features precise dimensional specifications including 20mm inner diameter, 56mm outer diameter, and 3.4-4.6mm thickness range. Manufactured to DIN 9021 standards for dimensional accuracy and performance reliability. The product demonstrates full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory adherence for industrial applications worldwide.