S-93783A011 0.18" ID x 0.443" OD High-Pressure Bonded Sealing Washers For Screw Heads

Key Features & Benefits at a Glance

• Superior Sealing Performance: Buna-N rubber seal bonded to zinc-plated steel creates a reliable, long-lasting barrier against fluids and gases, preventing leaks in demanding applications.
• Exceptional Durability & Corrosion Resistance: The zinc-plated steel body with a Rockwell B71 hardness ensures high mechanical strength and protection against rust, extending the washer's service life.
• Wide Temperature & Pressure Tolerance: Operates effectively from -40°F to 225°F and handles fluid pressures up to 6200 psi, making it suitable for extreme industrial environments.
• Optimized for No. 10 Screws: With a precise 0.18" ID and 0.443" OD, this washer ensures a perfect fit and uniform load distribution for secure fastening.
• Flexible & Resilient Seal: The Buna-N rubber seal with a Durometer 55A hardness provides excellent compression set resistance and maintains a tight seal under vibration.
• Compliance with Environmental Standards: Meets RoHS 3 and REACH regulations, ensuring safety and environmental responsibility for global supply chains.
• Versatile for Multiple Media: Rated for high-pressure fluids (6200 psi) and gases (200 psi), offering broad application flexibility in hydraulic and pneumatic systems.

Professional Applications & Engineering Value

This metal bonded washer is engineered to solve critical sealing challenges in industrial and automotive systems. The combination of a zinc-plated steel washer and a Buna-N rubber seal provides a robust solution for applications exposed to vibration, thermal cycling, and high-pressure fluids. It effectively prevents leakage in hydraulic fittings, pump assemblies, and compressed air systems, where failure can lead to downtime and safety hazards. The black Buna-N seal offers excellent resistance to oils, water, and many chemicals, ensuring long-term reliability. Designed for No. 10 screws in the inch system, it delivers consistent performance from -40°F to 225°F, making it ideal for outdoor equipment, machinery, and fluid power systems that operate under harsh conditions.

Specification Summary & Compliance

This washer features precise dimensions with an ID of 0.18", OD of 0.443", and a thickness range of 0.045-0.055" for a No. 10 screw size. Material specifications include zinc-plated steel with a hardness of Rockwell B71 and a Buna-N rubber seal with a Durometer 55A hardness. It is manufactured to comply with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for use in regulated industries.