S-91128A314 0.938" ID Square Washers

Key Features & Benefits at a Glance

• Enhanced load distribution with a 3" square design, reducing surface pressure and preventing material damage in heavy-duty applications
• Superior corrosion resistance from the black-oxide steel finish, extending service life in harsh industrial environments
• Precise compatibility with 7/8" screw sizes and 0.938" inner diameter, ensuring secure fastening and minimizing installation errors
• Exceptional durability backed by Rockwell 15N80 hardness, providing reliable performance under high stress and repeated use
• Consistent thickness control between 0.235-0.265", maintaining uniform pressure distribution and structural integrity
• Full environmental compliance with RoHS 3 and REACH standards, meeting global regulatory requirements for safe industrial use
• Optimized for inch-system applications, facilitating seamless integration with standard US hardware and construction projects

Professional Applications & Engineering Value

Engineered for demanding industrial settings, this black-oxide steel square washer addresses critical challenges in construction and heavy machinery assembly. The 3-inch square configuration significantly increases bearing surface area compared to round washers, effectively distributing loads and preventing bolt head embedment into soft materials or composite structures. The black-oxide surface treatment provides essential corrosion protection without significantly altering dimensional tolerances, making it ideal for outdoor applications and environments with moderate chemical exposure. With precise 0.938" ID dimensions specifically designed for 7/8" screw applications, this washer ensures proper alignment and reduces installation time while maintaining the structural integrity of connections. The combination of Rockwell 15N80 hardness and controlled thickness delivers consistent performance in high-vibration environments, minimizing maintenance requirements and extending service intervals for industrial equipment and structural frameworks.

Specification Summary & Compliance

This heavy-duty square washer features inch-system dimensions with 0.938" inner diameter and thickness ranging 0.235-0.265" for precise fitment. Manufactured from black-oxide steel with Rockwell 15N80 hardness specification, it meets industrial strength requirements for construction and machinery applications. The product maintains dimensional accuracy suitable for standard 7/8" screw sizes and is fully compliant with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as an alloying element in steel, along with complete REACH (EC 1907/2006) compliance updated to January 17, 2023, addressing 233 SVHC substances for environmental safety in industrial procurement.