S-90474A158 0.812" ID x 1.375" OD ASME Washers

Key Features & Benefits at a Glance

• Superior Load Distribution: The 1.375" outer diameter provides a wide bearing surface, effectively distributing the load and preventing surface damage to assembled materials.
• Exceptional Durability: Made from hardened steel with a Rockwell B80 hardness, this washer offers excellent resistance to wear, deformation, and impact in demanding applications.
• Precision Fit for 3/4" Screws: The 0.812" inner diameter ensures a snug, secure fit on 3/4" fasteners, minimizing movement and maintaining joint integrity.
• Consistent Performance: A controlled thickness range of 0.124" to 0.145" guarantees reliable performance and predictable clamping force in your assemblies.
• Compliance for Global Markets: Meets RoHS 3 and REACH compliance standards, ensuring the washer is safe for use in regulated industries and international supply chains.
• Versatile Inch Sizing: Designed to the inch system of measurement, making it a direct replacement or upgrade part for a wide range of existing machinery and equipment.
• Corrosion Resistance: The steel construction provides inherent strength and a good base for additional coatings, offering reliable protection in various industrial environments.

Professional Applications & Engineering Value

This high-performance steel flat washer is engineered to solve critical challenges in industrial assembly and maintenance. Its robust Rockwell B80 hardness ensures it can withstand high clamp loads and vibrational stresses without failing, a common pain point in heavy machinery, structural steelwork, and automotive applications. The precise 0.812" ID is optimized for 3/4" screw fasteners, eliminating slop and ensuring that the bolt's preload is effectively transferred through the washer to the joint. This design prevents loosening over time and protects sensitive surfaces from galling or indentation. As a fundamental component in inch-system bolting, it delivers reliable performance in construction, manufacturing, and MRO operations, providing a simple yet critical layer of reinforcement for your most demanding industrial fastening solutions.

Specification Summary & Compliance

This flat washer conforms to standard inch dimensions with an Inner Diameter (ID) of 0.812", Outer Diameter (OD) of 1.375", and a Thickness of 0.124-0.145". It is manufactured from high-strength steel and is heat-treated to a Rockwell B80 hardness for consistent mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, affirming its suitability for use in environmentally conscious and globally regulated industries.