S-90377A202 0.531" ID x 1.125" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from 18-8 stainless steel with black-oxide coating, ideal for harsh environments
• Precise dimensional fit with 0.531" ID ensuring secure seating on 1/2" screws
• Optimized load distribution through 1.125" OD design, reducing surface pressure
• Consistent performance with 0.110-0.140" thickness range for reliable spacing
• Environmental compliance meeting RoHS 3 and REACH standards for global industrial use
• Durable stainless steel construction providing long service life in mechanical assemblies
• Inch system compatibility for seamless integration with standard US hardware

Professional Applications & Engineering Value

These black-oxide 18-8 stainless steel flat washers deliver exceptional engineering value in demanding applications where corrosion resistance and dimensional precision are critical. The 18-8 stainless steel core provides inherent resistance to rust and chemical degradation, while the black-oxide surface treatment enhances protection in outdoor, marine, and industrial environments. With precise 0.531" ID matching standard 1/2" screw applications, these flat washers ensure proper load distribution across the 1.125" OD surface area, preventing component damage and maintaining joint integrity in mechanical assemblies, construction projects, and heavy equipment where vibration and environmental factors challenge fastener performance.

Specification Summary & Compliance

This flat washer features inch system dimensions with 0.531" inner diameter, 1.125" outer diameter, and thickness ranging 0.110-0.140". Manufactured from 18-8 stainless steel with black-oxide finish, these washers comply with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safe use in regulated industries worldwide.