S-91090A105 0.266" ID x 0.5" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in harsh industrial environments
• Precise dimensional fit with 0.266" ID and 0.5" OD ensuring reliable seating and load distribution for 1/4" screws
• Optimized thickness range (0.042-0.051") providing consistent compression and vibration resistance in assemblies
• Enhanced environmental compliance meeting RoHS 3 and REACH standards for safe, sustainable industrial applications
• Durable steel core offering excellent strength-to-weight ratio for long-term mechanical performance
• Broad compatibility with inch-system fasteners and standard industrial equipment configurations
• Cost-effective protection against galvanic corrosion and surface degradation in commercial assemblies

Professional Applications & Engineering Value

These zinc-plated steel flat washers deliver critical engineering solutions where corrosion resistance and dimensional precision are paramount. The zinc plating creates a sacrificial barrier that prevents rust formation in humid or chemically aggressive environments, while the 0.266" ID provides exact clearance for 1/4" screws to eliminate play and ensure proper clamp load distribution. With their 0.5" OD and controlled thickness, these flat washers effectively distribute bearing pressure across wider surfaces, preventing material deformation in soft substrates and reducing stress concentration in industrial equipment, machinery frames, and structural assemblies. Their compliance with major environmental regulations makes them ideal for OEM components and MRO applications requiring documented material safety.

Specification Summary & Compliance

This flat washer maintains standard inch-system dimensions with inner diameter of 0.266", outer diameter of 0.5", and thickness ranging 0.042-0.051" for consistent performance with 1/4" screw applications. Manufactured from zinc-plated steel, the washer provides reliable mechanical properties for general industrial use. The product fully complies with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations concerning chemical substances, ensuring environmental responsibility and workplace safety compliance.