S-91133A150 0.688" ID Square Washers

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with galvanized steel construction, ensuring long-term durability in harsh industrial environments
• Superior load distribution thanks to the 3" square design, minimizing surface pressure and preventing material damage
• Precise fit for 5/8" screws with 0.688" inner diameter, reducing installation errors and improving assembly efficiency
• Consistent thickness tolerance (0.235-0.265") for reliable performance under heavy loads and vibration
• High hardness rating (Rockwell B40) that resists deformation and maintains structural integrity in demanding applications
• Full regulatory compliance with RoHS 3 and REACH standards, ensuring safe use in global industrial supply chains
• Heavy-duty construction ideal for construction and machinery where standard washers fail prematurely

Professional Applications & Engineering Value

This heavy-duty square washer is engineered to solve common industrial fastening challenges, such as joint loosening and surface indentation. Made from galvanized steel, it provides excellent protection against rust and corrosion, extending service life in outdoor or high-moisture settings like construction sites and agricultural equipment. The square shape offers a larger bearing surface compared to round washers, distributing force more effectively to prevent damage to soft materials. With its precise 0.688" inner diameter designed for 5/8" screws, it ensures secure fits in structural assemblies, reducing maintenance needs. The Rockwell B40 hardness guarantees that the washer won't deform under stress, making it a reliable choice for heavy machinery, trailer hitches, and steel framing where vibration resistance is critical.

Specification Summary & Compliance

This washer meets inch system dimensional standards with an ID of 0.688", thickness range of 0.235-0.265", and width of 3". It is manufactured to precise tolerances for consistent performance in industrial applications. The product is fully compliant with RoHS 3 (2015/863/EU) under exemption 6(a) for lead in steel alloys and REACH (EC 1907/2006) regulations as of January 17, 2023, covering 233 SVHCs, ensuring environmental and safety adherence for global engineering projects.