S-91128A135 0.938" ID Square Washers

Key Features & Benefits at a Glance

• Enhanced load distribution with 2" square design for superior surface contact and reduced surface pressure
• Exceptional corrosion resistance through black-oxide steel coating for extended service life in harsh environments
• Precise compatibility with 0.938" inner diameter ensuring perfect fit for 7/8" screw applications
• Superior mechanical strength with Rockwell 15N80 hardness rating for reliable performance under heavy loads
• Optimized thickness range (0.235-0.265") providing consistent spacing and vibration resistance
• Full regulatory compliance meeting RoHS 3 and REACH standards for safe industrial use
• Dimensional stability in inch measurement system ensuring seamless integration with existing equipment

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these black-oxide steel square washers provide critical solutions for construction and mechanical assemblies. The square configuration offers significantly larger bearing surface compared to round washers, effectively preventing fastener embedment in soft materials and distributing clamp load across wider areas. The black-oxide surface treatment creates a protective barrier against corrosion and galling, making these washers ideal for outdoor equipment, structural steel connections, and machinery subjected to environmental exposure. With precise 0.938" ID matching standard 7/8" screw sizes, these components ensure proper alignment and prevent loosening under dynamic loads, while the controlled thickness tolerance maintains consistent joint integrity in critical bolted connections.

Specification Summary & Compliance

This heavy-duty square washer features inch system dimensions with 0.938" inner diameter, 2" width, and 0.235-0.265" thickness range. Manufactured from steel with Rockwell 15N80 hardness, the component maintains dimensional accuracy for reliable performance. The product is fully compliant with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as an alloying element in steel and meets REACH (EC 1907/2006) requirements regarding SVHC substances as of January 17, 2023, ensuring environmental responsibility and workplace safety standards.