S-91128A125 0.688" ID Square Washers

Key Features & Benefits at a Glance

• Exceptional load distribution with 2" square design for superior stability in heavy machinery applications
• Corrosion-resistant black-oxide steel construction ensures long-term durability in demanding industrial environments
• Precision 0.688" inner diameter provides perfect fit for 5/8" screws, eliminating installation issues
• Enhanced surface hardness (Rockwell 15N80) maintains structural integrity under high-pressure conditions
• Consistent 0.235-0.265" thickness tolerance guarantees reliable performance in critical assembly applications
• Full regulatory compliance with RoHS 3 and REACH standards for global industrial use without restrictions
• Heavy-duty inch system compatibility seamlessly integrates with existing industrial equipment and standards

Professional Applications & Engineering Value

This black-oxide steel square washer delivers exceptional engineering value through its optimized material properties and dimensional precision. The corrosion-resistant surface treatment significantly extends service life in harsh environments where moisture and chemicals are present, while the square configuration provides superior resistance to rotation compared to round washers. Engineered with Rockwell 15N80 hardness, this heavy-duty component maintains its structural integrity under extreme compressive loads, making it ideal for construction equipment, industrial machinery, and structural steel applications. The precise 0.688" inner diameter ensures perfect alignment with 5/8" screws, reducing installation time and preventing assembly errors in critical fastening systems.

Specification Summary & Compliance

This square washer features inch system dimensions with 0.688" inner diameter, 2" width, and controlled thickness between 0.235-0.265". Manufactured from black-oxide steel with Rockwell 15N80 hardness rating, the component 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) compliance standards as of January 17, 2023, addressing 233 Substances of Very High Concern. The washer is engineered for use with 5/8" screws in industrial applications requiring heavy-duty performance and regulatory compliance.