S-91195A147 7.8 mm ID x 25.4 mm OD Washdown Bonded Sealing Washers

Key Features & Benefits at a Glance

• Reliable leak prevention with permanently bonded silicone rubber seal that maintains integrity under repeated compression cycles
• Exceptional temperature resistance from -100°F to 400°F (-73°C to 204°C) for stable performance in extreme environments
• Dual-material durability combining corrosion-resistant 18-8 stainless steel with flexible silicone for long service life
• Precision M8 compatibility with 7.8mm ID and 25.4mm OD dimensions ensuring perfect fit for standard metric fasteners
• Consistent sealing performance with 50A durometer silicone providing optimal compression without over-hardening
• Regulatory compliance assurance meeting both RoHS 3 and REACH standards for global industrial applications
• Versatile pressure handling rated for 100 psi across both fluid and gas systems in demanding sealing applications

Professional Applications & Engineering Value

This metal bonded washer addresses critical sealing challenges in industrial environments where temperature fluctuations and chemical exposure compromise conventional gaskets. The 18-8 stainless steel base provides structural integrity and corrosion resistance, while the permanently bonded silicone rubber seal creates an impermeable barrier against moisture, dust, and contaminants. Engineered for M8 fastener systems, this solution prevents leakage in hydraulic equipment, automotive assemblies, and processing machinery operating under extreme temperature conditions from cryogenic to high-heat applications. The red silicone seal offers visual confirmation of proper installation and maintains flexibility across its entire service range, eliminating the need for separate gaskets and reducing assembly time in production lines.

Specification Summary & Compliance

This metric metal bonded washer features precision dimensions of 25.4mm OD and 7.8mm ID with 2-2.1mm thickness, specifically engineered for M8 screw applications. The assembly combines 18-8 stainless steel (Rockwell B80 hardness) with silicone rubber (Durometer 50A) bonded under high pressure for permanent integration. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material traceability. Rated for continuous operation from -100°F to 400°F with maximum pressure handling of 100 psi for both fluids and gases, this washer meets industrial sealing standards for precision mechanical assemblies.