S-90377A201 0.5" ID x 1.5" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from 18-8 stainless steel with black-oxide finish, ideal for harsh industrial environments
• Precise dimensional fit with 0.5" ID and 1.5" OD ensures proper load distribution for 7/16" screw applications
• Enhanced durability through consistent 0.170-0.200" thickness for reliable performance under pressure
• Environmental compliance with RoHS 3 and REACH standards for safe industrial usage
• Broad compatibility with inch-system fasteners across multiple industrial applications
• Reduced maintenance needs thanks to stainless steel construction resisting rust and degradation

Professional Applications & Engineering Value

These black-oxide 18-8 stainless steel flat washers deliver critical engineering solutions where corrosion resistance and dimensional precision are paramount. The 0.5" ID x 1.5" OD configuration with controlled thickness provides optimal surface contact and load distribution for 7/16" screw assemblies in demanding environments. The black-oxide surface treatment enhances both corrosion protection and aesthetic integration in industrial equipment, marine applications, and outdoor machinery. Engineered to prevent galvanic corrosion while maintaining consistent performance, these flat washers solve common fastener failure points in chemical processing, construction, and transportation sectors where moisture and corrosive agents are present.

Specification Summary & Compliance

Manufactured to standard inch dimensions with 0.5" inner diameter and 1.5" outer diameter, these flat washers feature a thickness range of 0.170-0.200" for consistent performance. The 18-8 stainless steel construction with black-oxide finish provides reliable corrosion resistance. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards ensures safe industrial usage and global regulatory acceptance.