S-91128A524 1.562" ID Square Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide steel coating, extending service life in harsh industrial environments
• Exceptional hardness rating of Rockwell 15N80 prevents deformation under heavy loads and repeated use
• Precision-engineered 1.562" inner diameter ensures perfect alignment and secure fastening for 1 1/2" screws
• Generous 4" width square design provides enhanced load distribution and prevents pull-through in soft materials
• Heavy-duty construction delivers reliable performance in demanding applications requiring maximum durability
• Full regulatory compliance with RoHS 3 and REACH standards for safe use in global industrial markets
• Inch system compatibility ensures seamless integration with existing North American equipment and specifications

Professional Applications & Engineering Value

This black-oxide steel square washer addresses critical engineering challenges in heavy machinery, structural steelwork, and industrial equipment assembly. The square configuration provides superior resistance to rotation compared to round washers, maintaining alignment during vibration and dynamic loading conditions. The black-oxide surface treatment creates a protective barrier against moisture, chemicals, and atmospheric corrosion, significantly extending component lifespan in outdoor or corrosive environments. With its Rockwell 15N80 hardness rating, this washer maintains structural integrity under extreme compression forces, preventing embedding and maintaining clamp load in critical connections. The precise 1.562" ID and 4" width dimensions ensure optimal load distribution across a wider surface area, reducing point loading and material stress in wood, composite, and metal applications.

Specification Summary & Compliance

Manufactured to inch system standards with precise dimensional tolerances, this square washer features a 1.562" inner diameter and 0.220-0.280" thickness range for consistent performance. The product complies 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 as of January 17, 2023, including compliance with 233 SVHC substances. The black-oxide steel construction and Rockwell 15N80 hardness specification ensure mechanical properties suitable for demanding industrial fastening applications.