S-90474A101 0.339" ID x 1.125" OD ASME Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from Black-Oxide 18-8 Stainless Steel, ideal for harsh or outdoor environments.
• Precise fit for 5/16" screws with 0.339" ID, ensuring secure fastening and reducing assembly errors.
• Enhanced load distribution with a 1.125" OD, protecting surfaces and extending joint life.
• Consistent thickness (0.050-0.080") for reliable performance and uniform clamping force.
• Durable Rockwell B68 hardness provides excellent wear resistance and long-term reliability.
• Compliance with RoHS 3 and REACH ensures environmental safety and global regulatory acceptance.
• Black-oxide finish offers added aesthetic appeal and mild corrosion protection.

Professional Applications & Engineering Value

This flat washer is engineered to address common industrial challenges such as surface damage, fastener loosening, and corrosion-induced failure. Made from 18-8 stainless steel with a black-oxide coating, it provides exceptional resistance to rust and oxidation, making it suitable for applications in marine, automotive, and construction industries where moisture and chemicals are present. The precise 0.339" ID and 1.125" OD ensure optimal load distribution, preventing material deformation and maintaining 5/16" screw integrity under vibration or dynamic loads. Its Rockwell B68 hardness further enhances durability, reducing replacement frequency and maintenance costs in demanding environments.

Specification Summary & Compliance

This washer meets standard inch system dimensions with an ID of 0.339", OD of 1.125", and thickness range of 0.050-0.080", designed for compatibility with 5/16" screws. It conforms to industry standards for flat washers and is manufactured from Black-Oxide 18-8 Stainless Steel with a hardness of Rockwell B68. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and safe for various industrial applications.