S-90377A138 0.156" ID x 0.5" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from Black-Oxide 18-8 Stainless Steel, ideal for harsh or humid environments
• Enhanced load distribution with precise 0.156" ID and 0.5" OD, reducing surface stress and fastener loosening
• Consistent performance under pressure thanks to Rockwell B68 hardness, ensuring durability and shape retention
• Reliable fit for No. 6 screws, providing secure fastening and minimizing assembly errors
• Compliance with strict environmental regulations including RoHS 3 and REACH, ensuring safe use in regulated industries
• Versatile thickness range (0.050-0.080") allowing for fine adjustments in spacing and tension control
• Long-term cost efficiency due to stainless steel's resistance to rust and wear, lowering replacement frequency

Professional Applications & Engineering Value

These Black-Oxide 18-8 Stainless Steel flat washers are engineered to address common industrial challenges such as corrosion-induced failure and uneven load distribution. The black-oxide coating enhances surface protection, making them suitable for outdoor equipment, marine hardware, and chemical processing applications where moisture and corrosive agents are prevalent. With a precision inch measurement system and optimized dimensions for No. 6 screw size, they ensure accurate alignment and prevent galvanic corrosion when paired with compatible fasteners. This combination of material integrity and dimensional accuracy extends equipment lifespan, reduces maintenance downtime, and supports reliable performance in heavy-duty industrial washers assemblies.

Specification Summary & Compliance

This flat washer adheres to standard inch dimensions with an inner diameter of 0.156", outer diameter of 0.5", and thickness range of 0.050-0.080". Manufactured from 18-8 Stainless Steel with a Rockwell B68 hardness rating, it ensures consistent mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for global industrial markets requiring environmental and safety standards.