S-98119A035 0.688" ID x 1.312" OD ASTM F436 Type 1 Structural Washers

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with hot-dipped galvanized steel coating, ideal for harsh industrial environments.
• Superior load distribution due to precise dimensions (0.688" ID, 1.312" OD), reducing surface stress on assemblies.
• High hardness rating of Rockwell C38 ensures long-term durability and resistance to deformation under pressure.
• Reliable compliance with ASTM F436 Type 1 standards, guaranteeing consistent performance in structural applications.
• Environmental safety assurance with RoHS 3 and REACH compliance, meeting strict regulatory requirements.
• Optimized for 5/8" screw sizes, providing secure fastening and ease of installation in inch-based systems.
• Robust thickness range (0.122-0.177") offers flexibility for varying gap and tension needs in heavy-duty setups.

Professional Applications & Engineering Value

This 5/8" flat washer is engineered to address common industrial challenges such as corrosion, load instability, and regulatory compliance. Constructed from hot-dipped galvanized steel, it provides a thick, protective zinc layer that significantly extends service life in moist or chemically aggressive settings, like construction sites or marine equipment. The ASTM F436 Type 1 specification ensures it can handle high-stress applications, such as structural bolting in bridges or machinery, where uniform load distribution is critical to prevent joint failure. Its Rockwell C38 hardness further enhances reliability by resisting wear and deformation, making it a go-to choice for engineers seeking heavy-duty flat washers that combine strength with environmental safety through RoHS and REACH adherence.

Specification Summary & Compliance

This washer features precise inch-system dimensions: Internal Diameter of 0.688", Outer Diameter of 1.312", and Thickness ranging from 0.122" to 0.177", designed for use with 5/8" screw sizes. It conforms to ASTM F436 Type 1 for structural integrity and is manufactured from hot-dipped galvanized steel with a hardness of Rockwell C38. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets current environmental and safety standards for industrial and construction applications.