S-90770A031 0.406" ID x 0.875" OD General Purpose Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from Alloy 20 stainless steel, ideal for harsh chemical and acidic environments
• Precise dimensional fit with 0.406" ID and 0.875" OD ensuring reliable seating for 3/8" fasteners
• Consistent load distribution with uniform 0.050-0.070" thickness for enhanced joint stability
• Environmental compliance assurance meeting RoHS 3 and REACH standards for global supply chain compatibility
• Durable industrial performance maintaining integrity in demanding applications without hardness limitations
• Broad compatibility with inch-system fasteners commonly used in North American industrial equipment

Professional Applications & Engineering Value

These Alloy 20 Stainless Steel flat washers deliver exceptional value in chemical processing, pharmaceutical equipment, and marine applications where standard stainless steels fail. The nickel-chromium-molybdenum copper alloy composition provides outstanding resistance to sulfuric acid, phosphoric acid, and other aggressive media that cause premature fastener failure. Engineered with precise inch-system dimensions (0.406" ID, 0.875" OD), these washers ensure perfect alignment with 3/8" fasteners while the controlled thickness range (0.050-0.070") maintains uniform stress distribution across mating surfaces. This combination of material excellence and dimensional precision solves critical challenges in corrosive environments where equipment reliability directly impacts operational safety and maintenance costs.

Specification Summary & Compliance

Manufactured to standard inch system measurements with ID 0.406", OD 0.875", and thickness tolerance of 0.050-0.070" for consistent performance. These flat washers comply with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring they contain no restricted substances above threshold limits. The Alloy 20 stainless steel construction provides inherent corrosion resistance without requiring additional hardness ratings for most industrial applications.