S-98189A300 0.375" ID x 0.875" OD ASME B18.21.1 General Purpose Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with A286 stainless steel construction for extended service life in harsh environments
• Exceptional mechanical strength with Rockwell C22 hardness to withstand high-load applications without deformation
• Precise dimensional compatibility with 5/16" screws (0.375" ID × 0.875" OD) ensuring perfect fit and uniform load distribution
• Reliable performance compliance with ASME B18.21.1 standards for guaranteed dimensional accuracy and interchangeability
• Enhanced environmental safety through RoHS 3 and REACH compliance, meeting strict international regulatory requirements
• Optimized thickness range (0.064-0.104") providing flexibility for various assembly clearance requirements
• Heavy-duty USS flat washer design offering maximum bearing surface protection for bolted connections

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these A286 stainless steel USS flat washers deliver critical performance advantages where standard washers fail. The premium A286 alloy provides exceptional corrosion resistance in chemical processing, marine, and aerospace environments, while the Rockwell C22 hardness ensures dimensional stability under extreme vibration and thermal cycling. The USS flat washer designation with its larger outer diameter creates an optimal load distribution surface, preventing joint loosening and surface damage in 5/16" screw assemblies. Manufactured to ASME B18.21.1 specifications, these washers maintain precise inch system dimensions (0.375" ID × 0.875" OD) for reliable interchangeability across industrial maintenance, heavy equipment manufacturing, and structural applications where failure is not an option.

Specification Summary & Compliance

This USS flat washer features precision inch system dimensions with 0.375" internal diameter, 0.875" outer diameter, and thickness ranging 0.064-0.104" specifically designed for 5/16" screw applications. Manufactured in compliance with ASME B18.21.1 standards for dimensional accuracy and mechanical properties. The product meets RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) regulations (updated 06/14/2023, 235 SVHC), ensuring environmental safety and regulatory acceptance for global industrial markets.