Midland Industries SS6403-08-08 Adjustable Union 1/2 in

Product Description

The MIDLAND INDUSTRIES SS6403-08-08 is a stainless steel adjustable union fitting designed to connect two 1/2-inch male SAE O-ring boss ports in hydraulic and fluid system plumbing. One end uses a Male Adjustable O-Ring Boss (MAORB) connection, which allows the fitting to be torqued into a fixed orientation during installation. The opposite end uses a standard Male O-Ring Boss (ORB) connection. Both ends are 3/4-16 UNF thread. Constructed from 316 stainless steel, this union is rated for operating temperatures up to 1000 degrees F, making it suitable for high-heat and corrosive fluid environments. Overall length is 1.644 inches. Licensed plumbers, pipefitters, and hydraulic system technicians are the primary installers.

The SS6403-08-08 is used in hydraulic lines, fuel systems, and industrial fluid plumbing where two male ORB-ported components must be joined without rotating either component. The MAORB end allows clocking adjustment, so the fitting can be aligned to the correct orientation before the jam nut is tightened. This fitting is part of Midland Industries SS6403-NWO Series, designed for SAE O-ring adapter applications in stainless steel. It is suited for both industrial and marine environments where 316 stainless steel corrosion resistance is required.

Key Features

• 316 stainless steel construction for high corrosion resistance in aggressive or marine environments
• Male Adjustable O-Ring Boss end allows positional clocking before final torque
• Rated to 1000 degrees F operating temperature for high-heat system applications
• Both connections are 3/4-16 UNF thread, 1/2-inch nominal port size
• Compact at 1.644 inches overall length for tight installation spaces
• Part of the SS6403-NWO Series SAE O-ring stainless adapter line

Compatibility

Designed as an OEM-style replacement or new-installation fitting for hydraulic and fluid systems using SAE O-ring boss ports with 3/4-16 UNF thread on both connection points.

Installation Notes

Installation should be performed by a licensed pipefitter, plumber, or qualified hydraulic technician. Depressurize and drain the system fully before removing or installing any fittings. Inspect O-ring seals before assembly and replace if worn or damaged. Tighten the MAORB jam nut only after the fitting is clocked to the desired orientation; do not rely on thread sealant in place of proper O-ring seating.