Parker 12 Hlo-s Tube Union O-ring Face Seal 3/4 in 6000 Psi

Product Description

The PARKER 12 HLO-S is a compression tube union with an O-Ring Face Seal (ORFS) end connection, designed for high-pressure hydraulic and fluid power lines. Constructed from steel, it connects two tube ends of 3/4 inch outside diameter with a rated maximum working pressure of 6000 psi. The ORFS interface provides a leak-free metal-to-metal seat backed by an O-ring, making it well-suited for demanding industrial, mobile hydraulic, and heavy equipment applications. This fitting is installed by hydraulic technicians, pipefitters, and maintenance mechanics working on fluid power systems.

This union fitting is used in hydraulic systems where a straight inline tube connection is required without welding or flaring beyond the compression sleeve. Typical installations include mobile equipment hydraulic lines, industrial machinery, and high-pressure fluid transfer circuits. The UNF thread standard ensures compatibility with standard inch-series hydraulic fittings and components common in North American equipment.

Key Features

• O-Ring Face Seal (ORFS) end connections for leak-free performance at high pressure
• Maximum working pressure rated at 6000 psi
• 3/4 inch tube outside diameter
• Steel construction for strength and durability in hydraulic service
• UNF thread standard for compatibility with standard inch-series hydraulic components
• Union configuration allows straight inline connection of two tube ends

Compatibility

Designed as an OEM-style replacement or service fitting for high-pressure hydraulic tube assemblies using 3/4 inch OD tubing with O-Ring Face Seal connections and UNF thread standard.

Installation Notes

Installation should be performed by a qualified hydraulic technician or pipefitter. Depressurize and isolate the hydraulic circuit completely before disassembly or fitting installation. Inspect the O-ring sealing surface for damage or contamination prior to assembly, and use a new O-ring if reusing the fitting. Torque to the fitting manufacturer's specified value using appropriate hydraulic fitting wrenches.