S-90474A121 0.812" ID x 1.375" OD ASME B18.21.1 ASME Washers

Key Features & Benefits at a Glance

• Exceptional load distribution with precise 0.812" ID and 1.375" OD dimensions for secure fit under 3/4" fasteners, preventing surface damage and joint failure
• Superior corrosion resistance through zinc yellow-chromate plating that withstands harsh industrial environments and extends service life
• Guaranteed mechanical strength with Rockwell C38 hardness and Grade 8 classification for heavy-duty applications requiring reliable performance
• Industry-standard compliance meeting ASME B18.21.1 specifications ensuring dimensional accuracy and interchangeability
• Environmental responsibility with RoHS 3 and REACH compliance, making them suitable for regulated industries worldwide
• Optimized thickness tolerance (0.090-0.112") providing consistent spacing and reliable clamping force in assembled components
• Enhanced durability through hardened steel construction that resists deformation under extreme pressure and vibration

Professional Applications & Engineering Value

These Grade 8 flat washers deliver critical engineering solutions where high-strength fastening systems face constant stress and environmental challenges. The zinc yellow-chromate plated steel construction provides dual protection against corrosion and wear, particularly valuable in manufacturing equipment, structural assemblies, and heavy machinery applications. With precise inch system dimensions and ASME B18.21.1 compliance, these washers ensure perfect fitment and load distribution, preventing bolt loosening and material fatigue in demanding industrial environments. The combination of Rockwell C38 hardness and Grade 8 classification makes them ideal for critical joints subject to vibration, heavy loads, and temperature variations, reducing maintenance frequency and improving operational safety.

Specification Summary & Compliance

Manufactured to ASME B18.21.1 standards with dimensional specifications including 0.812" ID, 1.375" OD, and thickness range of 0.090-0.112" for 3/4" screw size applications. The washers feature Rockwell C38 hardness and meet Grade 8 strength requirements for maximum reliability. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety and global market acceptance.