S-90377A169 0.406" ID x 1" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from 18-8 stainless steel with black-oxide coating, ideal for harsh industrial environments
• Precise dimensional fit with 0.406" inner diameter ensuring secure seating on 3/8" screws
• Enhanced load distribution through 1" outer diameter, reducing surface pressure and material stress
• Consistent performance with thickness range 0.040-0.060" providing reliable spacing and vibration resistance
• Environmental compliance meeting RoHS 3 and REACH standards for safe industrial applications
• Durable material properties offering excellent strength and longevity without hardness rating limitations
• Broad compatibility with inch-system fasteners commonly used in North American industrial applications

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 composition provides inherent protection against rust and chemical degradation, while the black-oxide surface treatment enhances durability in exposed environments. Engineered specifically for 3/8" screw applications, these washers effectively distribute clamping force across a 1" diameter surface area, preventing material deformation and maintaining joint integrity in industrial equipment, machinery assemblies, and outdoor structures. The controlled thickness range ensures consistent performance in vibration-prone applications, making them ideal for automotive, construction, and marine industries where reliability cannot be compromised.

Specification Summary & Compliance

This flat washer features precise inch-system dimensions with 0.406" inner diameter, 1" outer diameter, and thickness range of 0.040-0.060" designed for 3/8" screw size applications. Manufactured from 18-8 stainless steel with black-oxide surface treatment, the product maintains dimensional accuracy suitable for industrial fastener systems. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory acceptance for global industrial supply chains.