S-90474A143 0.812" ID x 1.375" OD ASME Washers

Key Features & Benefits at a Glance

• Enhanced Corrosion Resistance: The black-oxide steel finish provides a durable protective layer, extending service life in humid or corrosive industrial environments.
• Superior Load Distribution: With a 1.375" OD and 0.812" ID, this washer effectively spreads clamp load, preventing surface damage and maintaining joint integrity under high stress.
• Optimized for 3/4" Screws: Precision-engineered inner diameter ensures a perfect fit, reducing installation time and eliminating play for secure fastening.
• Exceptional Mechanical Strength: Rockwell B80 hardness offers reliable performance, resisting deformation under heavy loads and repeated use.
• Consistent Thickness for Uniform Clamping: A thickness range of 0.080-0.115" guarantees even pressure distribution, crucial for vibration-resistant assemblies.
• Compliance with Global Standards: Meets RoHS 3 and REACH regulations, ensuring safe use in international markets and environmentally sensitive applications.
• Versatile Industrial Application: Designed for heavy-duty machinery, construction, and automotive assemblies where durability and reliability are paramount.

Professional Applications & Engineering Value

This black-oxide steel flat washer is engineered to address common industrial challenges such as galvanic corrosion, joint loosening due to vibration, and premature fastener failure. The black-oxide surface treatment not only enhances corrosion resistance but also reduces friction during installation, making it ideal for heavy-duty applications in construction, automotive, and machinery assembly. Its precise dimensions—0.812" ID and 1.375" OD—ensure optimal load distribution, preventing surface indentation and maintaining structural integrity under dynamic loads. By utilizing Rockwell B80 hardness steel, this washer withstands high-stress environments without compromising performance, reducing maintenance cycles and downtime in critical operations.

Specification Summary & Compliance

This flat washer adheres to inch system standards with an inner diameter of 0.812", outer diameter of 1.375", and thickness ranging from 0.080" to 0.115", designed specifically for 3/4" screw sizes. Manufactured from black-oxide steel with a Rockwell B80 hardness, it ensures dimensional accuracy and mechanical reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in regulated industrial and international markets without hazardous substances.