S-90474A122 0.812" ID x 2.5" OD ASME B18.21.1 ASME Washers

Key Features & Benefits at a Glance

• Exceptional Load Distribution with a large 2.5" outer diameter, reducing surface pressure and preventing damage to assembled materials.
• Superior Corrosion Resistance from the zinc yellow-chromate plating, ensuring long-term reliability in harsh industrial environments.
• High-Strength Performance backed by a Grade 8 classification and Rockwell C38 hardness, providing dependable service under high-stress conditions.
• Precision Fit and Alignment with a 0.812" inner diameter designed for 3/4" screws, ensuring easy installation and secure fastening.
• Rigorous Quality Assurance through compliance with the ASME B18.21.1 standard, guaranteeing dimensional accuracy and consistent performance.
• Enhanced Durability from a robust thickness range of 0.146-0.174", offering excellent resistance to deformation under heavy loads.
• Environmental and Regulatory Compliance by meeting RoHS 3 and REACH directives, making it suitable for global supply chains and sensitive applications.

Professional Applications & Engineering Value

This Grade 8 flat washer is engineered to address critical challenges in heavy machinery, construction, and automotive assemblies where vibration loosening and material fatigue are common. The zinc yellow-chromate plated steel construction provides a robust barrier against rust and chemical exposure, significantly extending the service life of bolted joints. Its precise dimensions, including the 3/4" ID for screw size compatibility and 2.5" OD for optimal load spreading, ensure uniform clamping force and reduce the risk of joint failure. By conforming to ASME B18.21.1, this washer delivers reliable performance in high-torque applications, making it an essential component for engineers seeking to enhance the integrity and longevity of their industrial fastening systems.

Specification Summary & Compliance

This flat washer features an inner diameter of 0.812", outer diameter of 2.5", and thickness ranging from 0.146" to 0.174", designed for use with 3/4" screws in inch measurement systems. It complies with the ASME B18.21.1 standard for dimensional and mechanical requirements, ensuring precise fit and function. The washer is manufactured from zinc yellow-chromate plated steel with a hardness of Rockwell C38, and it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance for environmental safety.