S-90377A173 0.406" ID x 1.625" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from 18-8 stainless steel with black-oxide finish, ideal for humid or chemically aggressive environments
• Precise dimensional fit with 0.406" ID and 1.625" OD ensures secure seating for 3/8" screws, minimizing assembly misalignment
• Optimized load distribution across 0.050-0.080" thickness range reduces surface pressure and prevents fastener embedding
• Enhanced durability through stainless steel construction maintains performance in high-stress industrial applications
• Regulatory compliance with RoHS 3 and REACH standards guarantees safe use in regulated markets and sensitive applications
• Versatile compatibility with inch-system components simplifies sourcing for North American manufacturing and maintenance operations

Professional Applications & Engineering Value

Engineered for demanding assembly challenges, this Black-Oxide 18-8 Stainless Steel flat washer delivers critical protection against galvanic corrosion while maintaining electrical conductivity in grounding applications. The precise 0.406" ID creates a snug fit around 3/8" screws, preventing lateral movement in vibrating machinery, automotive assemblies, and outdoor infrastructure. With its 1.625" OD distributing clamp load over wider surfaces, the washer effectively prevents plastic deformation in soft substrates and composite materials. The corrosion-resistant properties make it particularly valuable in marine equipment, food processing machinery, and chemical processing plants where moisture and aggressive media would degrade standard washers.

Specification Summary & Compliance

This flat washer maintains standard inch dimensions with 0.406" inner diameter and 1.625" outer diameter, featuring a thickness range of 0.050-0.080" for versatile application requirements. Manufactured from 18-8 stainless steel with black-oxide surface treatment, the component demonstrates full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to international environmental and safety standards for industrial hardware.