S-94744A273 0.406" ID x 1.25" OD ASME B18.21.1 ASME Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc plating that protects against rust and extends service life in harsh industrial environments
• Exceptional load distribution due to the precise 1.25" outer diameter, preventing surface damage and joint loosening under stress
• Guaranteed fit for 3/8" screws with a 0.406" inner diameter ensuring easy installation and secure fastening alignment
• Enhanced durability and deformation resistance from Rockwell B40 hardness, maintaining performance under repeated loading
• Reliable dimensional consistency with a thickness range of 0.090-0.112", ensuring uniform pressure and vibration resistance
• Compliance with industry standards per ASME B18.21.1, providing assurance of quality and interchangeability in mechanical assemblies
• Safe for regulated industries with RoHS 3 and REACH compliance, meeting environmental and health safety requirements

Professional Applications & Engineering Value

These zinc-plated steel flat washers are engineered to solve common industrial challenges such as corrosion-induced failure and joint instability. The zinc plating provides a protective barrier against moisture and chemicals, significantly extending the lifespan of assemblies in outdoor, marine, or high-humidity settings. Their robust construction, with a 1.25" OD and controlled thickness, ensures even load distribution, which is critical for preventing bolt loosening and material surface indentation in heavy-duty applications like machinery, construction frameworks, and automotive components. By adhering to ASME B18.21.1 standards, these washers deliver predictable performance, reducing maintenance needs and enhancing the reliability of 3/8" screw-based fastening systems in demanding engineering projects.

Specification Summary & Compliance

This flat washer is manufactured to precise dimensional tolerances, including an inner diameter of 0.406", outer diameter of 1.25", and thickness between 0.090-0.112", ensuring compatibility with 3/8" screws. It conforms to the ASME B18.21.1 standard for flat washers, guaranteeing consistent quality and performance. The washer is made from zinc-plated steel with a Rockwell B40 hardness for mechanical strength. It is fully compliant with RoHS 3 (2015/863/EU) under exemption 6(a) for lead in steel alloys and REACH (EC 1907/2006) as of January 17, 2023, supporting use in environmentally conscious and regulated industries.