S-91128A145 1.312" ID Square Washers

Key Features & Benefits at a Glance

• Enhanced corrosion resistance from black-oxide steel surface treatment, extending service life in demanding environments
• Superior load distribution with 2" square design, preventing surface damage and maintaining joint integrity
• Precise compatibility with 1 1/4" screws and 1.312" inner diameter, ensuring secure fastening without slippage
• Exceptional hardness rating of Rockwell 15N80, providing reliable performance under high-stress conditions
• Consistent dimensional accuracy with 0.235-0.265" thickness range, guaranteeing uniform pressure distribution
• Full regulatory compliance with RoHS 3 and REACH standards, meeting international environmental and safety requirements
• Optimized for industrial applications using inch measurement system, simplifying procurement and replacement

Professional Applications & Engineering Value

This black-oxide steel square washer delivers critical engineering solutions where standard washers fail. The square configuration provides significantly larger surface contact area compared to round washers, effectively distributing clamp load and preventing material deformation in structural applications. The black-oxide coating creates a protective barrier against moisture and chemicals, addressing corrosion concerns in manufacturing facilities, outdoor equipment, and marine environments. With precise 1.312" inner diameter matching 1 1/4" screw sizes, this washer eliminates play and maintains alignment in heavy machinery, construction frameworks, and industrial assembly lines. The combination of Rockwell 15N80 hardness and controlled thickness tolerance ensures consistent performance in vibration-prone applications, making it ideal for automotive, infrastructure, and mechanical engineering projects requiring reliable, long-term fastening solutions.

Specification Summary & Compliance

Manufactured to precise dimensional standards with 1.312" inner diameter and thickness range of 0.235-0.265" for consistent performance. The washer features standard inch system measurements and is engineered for compatibility with 1 1/4" screw sizes. Material certification includes Rockwell 15N80 hardness specification. Full compliance with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as an alloying element in steel, and adherence to REACH (EC 1907/2006) regulations regarding substance restrictions, ensuring environmental responsibility and workplace safety standards.