Midland Industries 6403AO10 Adjustable Union Orb Steel

Product Description

The MIDLAND INDUSTRIES 6403AO10 is a steel adjustable union fitting designed for hydraulic plumbing connections where both ports require a Male Adjustable O-Ring Boss (ORB) interface. This fitting connects two hydraulic lines of the same size, allowing for positional adjustment of each end during assembly. The union body is machined from steel for durability under hydraulic system pressures. With a 7/8-14 thread on both sides and a 5/8-inch connection size at each port, the 6403AO10 provides a leak-resistant, adjustable seal through an O-ring at each connection point. It is typically installed by hydraulic system technicians and maintenance mechanics working on mobile or industrial hydraulic equipment.

This fitting is suited for use in hydraulic circuits where rigid or semi-rigid tubing or hose assemblies require a union connection with alignment flexibility. The adjustable O-ring boss design allows the technician to orient each port independently before locking the fitting in place, which is valuable in tight installations with limited routing clearance. The 6403AO10 belongs to Midland Industries 6403-NWO Series of Steel SAE O-Ring Adapters, making it a standard catalog fitting for OEM and aftermarket hydraulic plumbing applications in mobile machinery, industrial equipment, and fluid power systems.

Key Features

• Dual Male Adjustable O-Ring Boss ports allow independent port orientation on each side of the union
• 7/8-14 thread size on both ends provides a standardized SAE ORB fit
• Steel construction suitable for hydraulic service environments
• 5/8-inch connection size on both ports for matched-line plumbing
• Compact form factor at approximately 2.25 inches in length and 0.265 pounds

Compatibility

Designed as an OEM-style SAE O-Ring Boss union for steel hydraulic plumbing systems requiring a 5/8-inch Male Adjustable ORB connection on both ends with 7/8-14 thread.

Installation Notes

Installation should be performed by a qualified hydraulic technician or mechanic. Depressurize and isolate the hydraulic circuit fully before removing or installing any fittings. Inspect and lubricate the O-rings before assembly and confirm proper thread engagement before torquing. Do not overtighten, as damage to the O-ring seat will cause leaks.