S-91128A110 0.312" ID Square Washers

Key Features & Benefits at a Glance

• Superior load distribution with a large 2" square surface area, preventing surface damage and fastener loosening under heavy loads
• Enhanced corrosion resistance from the black-oxide steel finish, ensuring long-term durability in demanding industrial environments
• Precise compatibility with 1/4" screw sizes and a 0.312" inner diameter for accurate, secure fitting in inch-system applications
• Exceptional mechanical strength with Rockwell 15N80 hardness, maintaining structural integrity under high-stress conditions
• Consistent performance guaranteed by a controlled thickness range of 0.235-0.265", providing reliable spacing and vibration resistance
• Compliance with global standards including RoHS 3 and REACH, ensuring safe, regulated use in international industrial projects
• Versatile industrial utility as a heavy-duty square washer, suitable for construction and machinery where standard washers are insufficient

Professional Applications & Engineering Value

This black-oxide steel square washer is engineered to address common industrial challenges like uneven load distribution and corrosion-induced failure. Its 2" width and square design maximize surface contact, effectively spreading pressure in heavy-duty applications such as structural frameworks and machinery assembly. The black-oxide coating provides a protective barrier against moisture and chemicals, reducing maintenance needs in harsh environments. With a precise 0.312" inner diameter for 1/4" screw sizes, it ensures easy installation and secure fastening, while the Rockwell 15N80 hardness offers resilience against deformation. Ideal for construction, automotive, and equipment manufacturing, this washer enhances safety and longevity in critical industrial washers systems.

Specification Summary & Compliance

This square washer features an inner diameter of 0.312" and thickness range of 0.235-0.265", designed for use with 1/4" screws in inch measurement systems. It complies with RoHS 3 (2015/863/EU) under exemption 6(a) for lead in steel and REACH (EC 1907/2006) standards as of January 17, 2023, ensuring environmental and safety adherence. Manufactured from black-oxide steel with a hardness of Rockwell 15N80, it meets industrial requirements for durability and precision in load-bearing applications.