S-90377A154 0.406" ID x 0.875" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to 18-8 stainless steel construction with black-oxide finish, ideal for harsh industrial environments
• Excellent load distribution with precise 0.406" ID and 0.875" OD dimensions, preventing surface damage and maintaining joint integrity
• Enhanced durability with Rockwell B68 hardness, providing reliable performance under repeated stress and vibration
• Perfect compatibility with 3/8" screws, ensuring secure fastening and reducing installation time
• Environmental compliance with RoHS 3 and REACH regulations, meeting global standards for safe manufacturing
• Consistent thickness control between 0.110-0.140", delivering uniform pressure distribution and reliable sealing
• Long-term cost efficiency through reduced maintenance and replacement needs in demanding applications

Professional Applications & Engineering Value

These black-oxide 18-8 stainless steel flat washers deliver exceptional engineering value in applications where corrosion resistance and mechanical reliability are critical. The 18-8 stainless steel material combined with the black-oxide surface treatment provides superior protection against rust and chemical degradation, making these flat washers ideal for outdoor equipment, marine hardware, and industrial machinery exposed to moisture and aggressive environments. With precise 0.406" ID x 0.875" OD dimensions and controlled thickness, they ensure optimal load distribution for 3/8" screw assemblies, preventing loosening under vibration and extending service life. The Rockwell B68 hardness maintains structural integrity in high-stress applications, while the inch system compatibility simplifies sourcing for North American manufacturing and maintenance operations.

Specification Summary & Compliance

This flat washer features standard inch dimensions with 0.406" inner diameter and 0.875" outer diameter, designed specifically for 3/8" screw applications. The material meets 18-8 stainless steel specifications with black-oxide finish for enhanced corrosion protection. Hardness is certified at Rockwell B68 for consistent mechanical performance. 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 use worldwide.