S-90377A167 0.344" ID x 2.5" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and black-oxide coating, ideal for harsh industrial environments
• Precise dimensional fit with 0.344" inner diameter specifically engineered for 5/16" screw applications
• Optimal load distribution through large 2.5" outer diameter design, reducing surface pressure and material stress
• Consistent thickness tolerance between 0.050-0.080" ensures reliable performance in assembly applications
• Environmental compliance assurance with RoHS 3 and REACH compliance for global industrial standards
• Durable material performance from 18-8 stainless steel offering excellent strength and longevity
• Enhanced friction characteristics from black-oxide surface treatment improving installation and retention

Professional Applications & Engineering Value

This black-oxide 18-8 stainless steel flat washer delivers exceptional engineering value in demanding industrial applications where corrosion resistance and reliable performance are critical. The combination of 18-8 stainless steel material and protective black-oxide coating provides superior protection against rust and chemical exposure in outdoor, marine, and chemical processing environments. The precise 0.344" inner diameter ensures perfect compatibility with 5/16" screw sizes, while the generous 2.5" outer diameter effectively distributes clamping force across wider surface areas, preventing material deformation and joint failure. These industrial washers are engineered to maintain integrity under vibration and thermal cycling, making them ideal for machinery assembly, structural fastening, and heavy equipment applications where long-term reliability is paramount.

Specification Summary & Compliance

This flat washer features inch system measurements with 0.344" inner diameter and 2.5" outer diameter, manufactured from 18-8 stainless steel with black-oxide surface treatment. The washer maintains precise dimensional control with thickness ranging from 0.050" to 0.080" and is specifically designed for 5/16" screw applications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory acceptance for industrial and commercial use worldwide.