S-90850A100 0.286" ID x 0.64" OD ASME B18.21.1 General Purpose Washers

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with zinc yellow-chromate plating, extending service life in harsh industrial environments
• Superior load distribution thanks to precise 0.286" ID and 0.64" OD dimensions, preventing surface damage and fastener loosening
• High-strength performance with Grade 9 classification and Rockwell C40 hardness, ensuring reliable performance under heavy loads
• Industry-standard compliance with ASME B18.21.1 specifications, guaranteeing dimensional accuracy and interchangeability
• Environmental responsibility through RoHS 3 and REACH compliance, meeting strict international regulatory requirements
• Optimized thickness tolerance (0.056-0.071") for consistent performance and easy installation in 1/4" fastener applications
• Enhanced durability through hardened steel construction, resisting deformation under extreme pressure conditions

Professional Applications & Engineering Value

These Grade 9 flat washers deliver critical engineering solutions where high-strength fastening systems face demanding operational conditions. The zinc yellow-chromate plated steel construction provides superior corrosion resistance, making them ideal for outdoor equipment, industrial machinery, and automotive assemblies exposed to moisture and chemicals. With precise 1/4" screw size compatibility and controlled thickness variations, these ASME B18.21.1 compliant washers prevent joint failure by distributing clamp load evenly across mating surfaces. The combination of Rockwell C40 hardness and inch system dimensions ensures reliable performance in heavy-duty applications where vibration resistance and long-term fastener integrity are paramount for operational safety and reduced maintenance cycles.

Specification Summary & Compliance

Manufactured to exacting ASME B18.21.1 standards, these flat washers maintain precise dimensional tolerances with 0.286" inner diameter, 0.64" outer diameter, and thickness ranging from 0.056" to 0.071". The Grade 9 classification and Rockwell C40 hardness verify the high-strength characteristics suitable for demanding industrial applications. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental responsibility and workplace safety, making these washers suitable for global industrial supply chains requiring certified components.