S-90377A132 0.531" ID x 1" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with Black-Oxide 18-8 Stainless Steel construction, ideal for harsh industrial environments
• Exceptional durability with Rockwell B68 hardness, ensuring long service life under heavy loads
• Precise dimensional fit with 0.531" ID and 1" OD, providing reliable performance for 1/2" screw applications
• Enhanced load distribution due to flat washer design, reducing surface pressure and preventing material damage
• Environmental compliance with RoHS 3 and REACH standards, meeting strict industrial safety regulations
• Broad compatibility with inch-system components, simplifying procurement and assembly processes
• Consistent thickness between 0.060-0.090", ensuring uniform clamping force and vibration resistance

Professional Applications & Engineering Value

This Black-Oxide 18-8 Stainless Steel flat washer delivers critical engineering solutions where corrosion resistance and mechanical strength are paramount. The 18-8 stainless steel base material combined with black-oxide surface treatment provides excellent protection against oxidation and chemical exposure, making it suitable for outdoor equipment, marine applications, and chemical processing plants. Its Rockwell B68 hardness ensures the washer maintains structural integrity under sustained pressure, while the precise 0.531" ID and 1" OD dimensions guarantee perfect alignment with 1/2" screw fasteners, preventing loosening from vibration. These features make it an essential component for heavy-duty industrial assemblies, automotive systems, and infrastructure projects requiring reliable, long-term fastening performance.

Specification Summary & Compliance

This flat washer meets standard inch-system dimensional requirements with an inner diameter of 0.531", outer diameter of 1", and thickness ranging 0.060-0.090". Manufactured from 18-8 Stainless Steel with black-oxide finish, it maintains Rockwell B68 hardness for consistent mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety standards for industrial applications.