S-90476A113 0.391" ID x 1" OD ASME B18.21.1 USS Washers

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with zinc yellow-chromate plating for long-lasting performance in harsh industrial environments
• Superior load distribution with precise 0.391" ID and 1" OD dimensions to prevent surface damage and maintain joint integrity
• High-strength durability achieved through Rockwell C43 hardness rating for reliable performance under heavy loads
• Grade 9 heavy-duty classification ensures maximum reliability for critical 3/8" screw fastening applications
• Industry-standard compliance with ASME B18.21.1 specifications guarantees consistent quality and interchangeability
• Environmental responsibility with RoHS 3 and REACH compliance for safe use across regulated industries
• Optimized thickness range (0.079-0.093") provides perfect balance between strength and installation flexibility

Professional Applications & Engineering Value

Engineered for demanding industrial applications, this Grade 9 USS flat washer delivers critical performance where vibration resistance and load distribution are paramount. The zinc yellow-chromate plated steel construction provides superior corrosion protection in outdoor, marine, and chemical exposure environments, significantly extending service life and reducing maintenance costs. With its Rockwell C43 hardness and precise dimensional tolerances, this heavy-duty washer prevents bolt loosening, distributes clamping forces evenly, and protects sensitive surfaces from damage. Ideal for structural steel connections, heavy machinery assembly, and industrial equipment maintenance, this 3/8" screw compatible washer ensures reliable fastening in critical applications where failure is not an option. The combination of high-strength material and advanced surface treatment makes it an essential component for engineers specifying durable fastener systems.

Specification Summary & Compliance

This USS flat washer features precise inch system dimensions with 0.391" inner diameter and 1" outer diameter, manufactured to ASME B18.21.1 standards for dimensional accuracy and performance consistency. The washer maintains a thickness range of 0.079-0.093" and is constructed from zinc yellow-chromate plated steel with Rockwell C43 hardness, achieving Grade 9 strength classification. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory adherence for industrial applications worldwide.