S-90377A204 0.531" ID x 1.5" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from Black-Oxide 18-8 Stainless Steel for long-lasting performance in harsh environments
• Precise dimensional fit with 0.531" ID and 1.5" OD ensuring reliable installation with 1/2" screws
• Enhanced load distribution through substantial 1.5" outer diameter, reducing surface pressure and material stress
• Durable construction with 0.110-0.140" thickness providing consistent performance under heavy-duty conditions
• Environmental compliance assurance meeting RoHS 3 and REACH standards for sustainable industrial operations
• Versatile industrial compatibility designed for inch-system applications across multiple sectors
• Reduced maintenance requirements thanks to stainless steel's inherent durability and protective black-oxide finish

Professional Applications & Engineering Value

This Black-Oxide 18-8 Stainless Steel flat washer delivers exceptional engineering value in demanding industrial environments where corrosion resistance and dimensional precision are critical. The 18-8 stainless steel construction provides inherent protection against rust and chemical degradation, while the black-oxide surface treatment enhances both corrosion resistance and aesthetic appeal. Engineered with a 0.531" inner diameter specifically for 1/2" screw applications, this washer ensures perfect fitment while the generous 1.5" outer diameter effectively distributes clamping force, preventing surface damage and maintaining joint integrity. Ideal for industrial machinery, marine equipment, and outdoor installations, this flat washer solves common challenges of fastener loosening, material galling, and premature failure in corrosive environments.

Specification Summary & Compliance

This precision flat washer features inch-system dimensions with 0.531" inner diameter, 1.5" outer diameter, and 0.110-0.140" thickness range, engineered for Class 2A fit applications. Manufactured from 18-8 stainless steel with black-oxide finish, the product maintains dimensional accuracy per standard industrial specifications. The washer is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant (including 224 SVHC substances as of 06/10/2022), meeting stringent environmental regulations for industrial components.