S-91128A802 1.812" ID Square Washers

Key Features & Benefits at a Glance

• Exceptional corrosion resistance from black-oxide steel coating, extending service life in harsh industrial environments
• Superior load distribution with 4" square design, preventing surface damage and maintaining joint integrity
• Precise compatibility with 1 3/4" screws through 1.812" ID, ensuring secure fastening and reduced installation time
• Enhanced durability with Rockwell 15N80 hardness, resisting deformation under heavy mechanical stress
• Reliable thickness tolerance (0.220-0.280") for consistent performance in demanding applications
• Full regulatory compliance with RoHS 3 and REACH standards, meeting global environmental and safety requirements
• Optimized for inch-system applications, providing seamless integration with existing industrial equipment and standards

Professional Applications & Engineering Value

This black-oxide steel square washer delivers critical engineering solutions for heavy machinery, structural steel connections, and industrial equipment assembly. The 4" width and square configuration provide maximum bearing surface area, effectively distributing clamp load to prevent material crushing and joint loosening in high-vibration environments. The black-oxide surface treatment creates a protective barrier against moisture, oils, and chemicals, significantly enhancing corrosion resistance while maintaining dimensional stability. Engineered specifically for 1 3/4" screw applications with precise 1.812" inner diameter, this washer ensures proper alignment and secure fastening in construction, manufacturing, and maintenance operations where reliability is paramount.

Specification Summary & Compliance

Manufactured to inch system standards with critical dimensions including 1.812" inner diameter, 4" width, and 0.220-0.280" thickness range. The black-oxide steel construction provides consistent performance with Rockwell 15N80 hardness rating. Fully compliant with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as an alloying element in steel and REACH (EC 1907/2006) regulations (updated January 17, 2023, 233 SVHC), ensuring environmental responsibility and workplace safety standards are met for industrial applications worldwide.