S-93781A010 0.167" ID x 0.406" OD High-Pressure Bonded Sealing Washers For Nuts

Key Features & Benefits at a Glance

• Superior sealing performance with Buna-N rubber bonded to steel, preventing fluid and gas leaks in demanding applications
• Excellent corrosion resistance from zinc-plated steel construction, extending service life in harsh industrial environments
• High-pressure capability withstands up to 2000 psi fluid pressure, ensuring reliable performance in hydraulic and pneumatic systems
• Wide temperature tolerance from -30°F to 220°F, maintaining seal integrity across extreme thermal conditions
• Optimized dimensional stability with precise 0.167" ID and 0.406" OD for perfect No. 8 screw compatibility
• Dual-material durability combining Rockwell B71 steel hardness with Durometer 55A rubber flexibility for long-lasting performance
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for global industrial applications

Professional Applications & Engineering Value

This No. 8 metal bonded washer solves critical sealing challenges in industrial equipment where fluid containment and environmental resistance are paramount. The zinc-plated steel base provides structural integrity while the Buna-N rubber seal creates an impermeable barrier against fluids, dust, and contaminants. Engineered for high-pressure applications up to 2000 psi, this bonded washer prevents leakage in hydraulic systems, pneumatic controls, and fluid processing equipment. The black Buna-N seal material maintains flexibility across extreme temperatures from -30°F to 220°F, ensuring reliable performance in outdoor, automotive, and manufacturing environments where thermal cycling occurs. This combination of metal strength and rubber sealing eliminates the need for separate components, reducing assembly time and potential failure points in critical industrial fastening applications.

Specification Summary & Compliance

Precision-engineered with 0.167" inner diameter and 0.406" outer diameter for perfect fit with No. 8 screws. The washer features consistent 0.045-0.055" thickness for uniform compression. Material specifications include Rockwell B71 hardness for the steel component and Durometer 55A for the Buna-N rubber seal. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety and global market acceptance for industrial applications.