S-93781A039 0.765" ID x 1.375" OD High-Pressure Bonded Sealing Washers For Nuts

Key Features & Benefits at a Glance

• Superior sealing performance with Buna-N rubber bonded to steel, providing reliable leak prevention for fluid systems 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
• Precise dimensional fit with 0.765" ID specifically engineered for 3/4" screws, ensuring proper installation and load distribution
• Enhanced durability from Rockwell B71 hardness steel core, resisting deformation under high pressure applications
• Optimal seal performance with 55A durometer Buna-N rubber offering ideal flexibility and compression recovery
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for global industrial applications

Professional Applications & Engineering Value

This metal bonded washer combines the structural strength of zinc-plated steel with the sealing reliability of Buna-N rubber to solve critical challenges in high-pressure fluid systems. The permanent bond between metal and elastomer prevents seal displacement under vibration and pressure cycling, while the 1.375" OD provides ample sealing surface for flanges and connections. Engineered for industrial applications requiring both mechanical strength and fluid containment, this washer eliminates the need for separate gaskets and washers, simplifying assembly in hydraulic systems, pump connections, and pressure vessels. The black Buna-N seal offers excellent resistance to oils, water, and most industrial fluids, making it ideal for maintenance and OEM applications where reliability is paramount.

Specification Summary & Compliance

This washer features inch system dimensions with 0.765" ID, 1.375" OD, and thickness between 0.104-0.114" for precise fit with 3/4" fasteners. The zinc-plated steel core provides Rockwell B71 hardness for structural integrity, while the bonded Buna-N rubber seal (55A durometer) ensures reliable fluid containment. The product is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, ensuring environmental responsibility and regulatory acceptance for industrial applications worldwide.