S-90377A172 0.406" 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 environments and outdoor applications
• Precise dimensional compatibility with 0.406" inner diameter specifically engineered for 3/8" screw applications
• Optimal load distribution with 1.5" outer diameter providing excellent surface coverage and pressure dispersion
• Consistent performance maintained through controlled thickness range of 0.050-0.080" for reliable seating and spacing
• Environmental compliance assurance meeting RoHS 3 and REACH standards for safe industrial use
• Long-term durability from stainless steel construction resisting rust, oxidation, and chemical exposure
• Broad industrial compatibility with inch measurement system for seamless integration into existing equipment and assemblies

Professional Applications & Engineering Value

These black-oxide 18-8 stainless steel flat washers deliver exceptional engineering value in demanding industrial environments where corrosion resistance and dimensional precision are critical. The 18-8 stainless steel core provides fundamental protection against rust and chemical degradation, while the black-oxide surface treatment enhances both corrosion resistance and aesthetic appeal. Engineered specifically for 3/8" screw applications, these washers solve common industrial challenges including galvanic corrosion, fastener loosening due to vibration, and surface damage from uneven load distribution. The precise 0.406" ID ensures perfect screw alignment while the generous 1.5" OD distributes clamping force effectively across wider surfaces, preventing material deformation and extending the service life of both the fastener and the assembled components. Ideal for marine equipment, food processing machinery, outdoor structures, and chemical processing applications where environmental factors would compromise standard washers.

Specification Summary & Compliance

This flat washer features precise dimensional specifications including 0.406" inner diameter, 1.5" outer diameter, and thickness ranging from 0.050" to 0.080" with standard inch system tolerances. Manufactured from 18-8 stainless steel with black-oxide surface treatment, the product maintains compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe industrial use and environmental responsibility. The washers are specifically engineered for compatibility with 3/8" screw applications across various industrial and construction settings.