S-90377A141 0.188" ID x 0.438" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with Black-Oxide 18-8 Stainless Steel, ideal for harsh industrial environments and extending component lifespan.
• Enhanced load distribution due to precise 0.188" ID and 0.438" OD dimensions, reducing surface pressure and preventing material damage.
• Exceptional durability from Rockwell B68 hardness, ensuring reliable performance under repeated stress and vibration.
• Perfect fit for No. 8 screws, minimizing installation errors and improving assembly efficiency in various applications.
• Consistent thickness control (0.050-0.080") for uniform clamping force and secure fastening in critical setups.
• Environmental compliance assurance with RoHS 3 and REACH standards, meeting global regulatory requirements for safe usage.
• Versatile inch system compatibility, facilitating easy integration into existing designs and reducing procurement complexity.

Professional Applications & Engineering Value

This Black-Oxide 18-8 Stainless Steel flat washer delivers robust engineering solutions by addressing common industrial challenges like corrosion, wear, and fastener failure. Its stainless steel construction with a protective black-oxide finish resists moisture, chemicals, and oxidation, making it suitable for outdoor equipment, marine hardware, and automotive assemblies. The precise 0.188" ID and 0.438" OD ensure optimal alignment with No. 8 screw sizes, preventing loosening under dynamic loads. Engineers value its Rockwell B68 hardness for maintaining integrity in high-stress applications, from machinery mounts to electrical enclosures, while the consistent thickness range supports reliable torque transmission and vibration damping.

Specification Summary & Compliance

This flat washer adheres to standard inch measurement tolerances, with an inner diameter of 0.188", outer diameter of 0.438", and thickness between 0.050" to 0.080". It is manufactured from 18-8 Stainless Steel with a black-oxide surface treatment and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring environmental safety and regulatory alignment for industrial use.