S-98038A279 0.938" ID x 1.75" OD ASTM F436 Type 1 Structural Washers

Key Features & Benefits at a Glance

• Superior Load Distribution - The 1.75" OD and 0.938" ID provide a wide bearing surface to evenly distribute pressure, preventing surface damage and joint loosening under heavy loads.
• Exceptional Durability - Made from high-strength steel with a Rockwell C38 hardness, this washer resists deformation and maintains integrity in demanding applications.
• Guaranteed Material Consistency - Compliance with ASTM F436 Type 1 ensures uniform mechanical properties and reliable performance in structural and heavy machinery applications.
• Precision Fit for 7/8" Screws - The accurately sized inner diameter ensures a perfect fit, reducing installation time and improving the security of the fastened assembly.
• Enhanced Corrosion & Wear Resistance - The specified hardness and material quality contribute to long-term resistance against wear and environmental factors, extending service life.
• Global Environmental Compliance - Meets RoHS 3 and REACH standards, making these washers suitable for international projects and environmentally conscious industries.
• Versatile Industrial Application - Designed for use in construction, machinery, and structural steelwork where reliable, high-strength fastening is critical.

Professional Applications & Engineering Value

This ASTM F436 Type 1 steel flat washer is engineered to address common industrial challenges such as joint failure, surface indentation, and uneven load distribution. Its robust construction from high-strength steel and precise dimensions (0.938" ID x 1.75" OD) ensure optimal performance in structural connections, heavy machinery, and construction applications. The Rockwell C38 hardness provides excellent resistance to deformation under high bolt tension, maintaining clamp load integrity and preventing loosening due to vibration or dynamic loads. By specifying this washer, engineers and procurement professionals can enhance the reliability and longevity of their assemblies, reducing maintenance costs and downtime. Its compliance with stringent ASTM standards and environmental regulations like RoHS and REACH further ensures suitability for global industrial and infrastructure projects requiring dependable mechanical fasteners.

Specification Summary & Compliance

This flat washer features an inner diameter of 0.938", outer diameter of 1.75", and thickness ranging from 0.136" to 0.177", designed for use with 7/8" screw sizes. It conforms to ASTM F436 Type 1 specifications, ensuring consistent mechanical properties and dimensional accuracy. The washer is manufactured from steel with a hardness of Rockwell C38, providing reliable performance in load-bearing applications. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) confirms adherence to environmental and safety standards, making it suitable for various industrial and export markets.