S-93781A035 0.683" ID x 1.187" OD High-Pressure Bonded Sealing Washers For Nuts

Key Features & Benefits at a Glance

• Superior sealing performance with permanently bonded Buna-N rubber that prevents fluid leakage under pressures up to 5000 psi
• Excellent corrosion resistance due to zinc-plated steel construction, extending service life in harsh industrial environments
• Wide temperature compatibility from -30°F to 220°F, maintaining seal integrity across diverse operating conditions
• Optimized dimensional stability with precise 0.683" ID and 1.187" OD ensuring perfect fit for 5/8" fasteners
• Dual-material durability combining Rockwell B71 metal hardness with Durometer 55A rubber flexibility for long-term reliability
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for global industrial applications
• Enhanced vibration resistance through the metal-to-rubber bond that maintains seal under dynamic loading conditions

Professional Applications & Engineering Value

This metal bonded washer solves critical sealing challenges in high-pressure fluid systems where standard washers fail. The zinc-plated steel base provides structural integrity while the chemically bonded Buna-N rubber seal creates an impermeable barrier against fluids and gases. Engineering teams specify these washers for hydraulic systems, pneumatic equipment, and industrial machinery where 5000 psi fluid pressure ratings and temperature resistance from -30°F to 220°F are essential. The black Buna-N seal material offers excellent compression set resistance, ensuring maintained sealing force in bolted connections subject to vibration and thermal cycling. This combination addresses common failure points in industrial washers by providing both mechanical strength and reliable sealing in a single component.

Specification Summary & Compliance

Precision-engineered with 0.683" inner diameter and 1.187" outer diameter for 5/8" fastener applications. The zinc-plated steel construction achieves Rockwell B71 hardness while the bonded Buna-N rubber seal maintains Durometer 55A hardness. Manufacturing complies with industry standards for metal bonded washers with thickness tolerance of 0.089-0.099". Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, including the latest SVHC requirements as of January 2023.