S-91195A140 3.9 mm ID x 25.4 mm OD Washdown Bonded Sealing Washers

Key Features & Benefits at a Glance

• Superior Sealing Performance with bonded silicone rubber that prevents fluid and gas leaks under pressures up to 100 psi
• Exceptional Temperature Resistance maintains integrity across a wide range from -100°F to 400°F for demanding environments
• Corrosion-Resistant Construction using 18-8 stainless steel ensures long-term durability and reliability in harsh conditions
• Precision Metric Fit with 3.9mm ID and 25.4mm OD designed specifically for M4 screws, ensuring secure fastening
• Dual-Material Hardness combines Rockwell B80 metal hardness with Durometer 50A silicone for optimal compression and seal retention
• Regulatory Compliance Ready meets RoHS 3 and REACH standards for safe use in regulated industrial applications
• Easy Visual Identification with distinctive red silicone seal for quick inspection and installation verification

Professional Applications & Engineering Value

This metal bonded washer solves critical sealing challenges in industrial equipment where standard washers fail. The 18-8 stainless steel base provides structural integrity while the permanently bonded silicone rubber seal creates an impermeable barrier against fluids and gases. Engineered for M4 metric fasteners, it prevents leakage in pneumatic systems, hydraulic assemblies, and temperature-controlled enclosures. The combination of high-temperature resistance (-100°F to 400°F) and pressure handling (100 psi) makes it ideal for automotive, manufacturing, and processing equipment where thermal cycling and pressure fluctuations would compromise ordinary seals. The metal-to-rubber bonding technology ensures the seal remains securely positioned during installation and throughout service life.

Specification Summary & Compliance

This precision metric washer features exact dimensions of 25.4mm OD and 3.9mm ID with 2-2.1mm thickness for consistent M4 screw compatibility. Manufactured to industrial standards using 18-8 stainless steel (Rockwell B80) and silicone rubber (Durometer 50A) sealing material. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material traceability for industrial procurement requirements.