Parker 6 HL6-S Swivel Union O-ring Face Seal 3/8 Inch

Product Description

The PARKER 6 HL6-S is a compression tube swivel union with an O-Ring Face Seal (ORFS) end connection, designed for high-pressure hydraulic and fluid power lines. Constructed from steel, this fitting connects two tube ends while allowing rotational movement to reduce assembly stress. The swivel design accommodates alignment variations during installation and service. Rated to 9200 psi maximum working pressure, it is suited for demanding industrial and mobile hydraulic applications. The ORFS connection type provides a leak-resistant metal-to-metal seal backed by an O-ring, making it a reliable choice for systems where fluid integrity is critical.

This swivel union is used in hydraulic circuits, fluid transfer systems, and high-pressure plumbing assemblies across industrial, agricultural, and mobile equipment applications. It accommodates 3/8 inch outside diameter tubing and uses UNF thread standards. Typical installers include hydraulic system technicians and fluid power mechanics working on equipment requiring rotationally flexible tube-to-tube connections.

Key Features

• O-Ring Face Seal (ORFS) end connections for leak-resistant, high-integrity sealing
• Swivel union design allows rotational movement to ease alignment during installation
• Steel construction for strength and durability in high-pressure environments
• Rated to 9200 psi maximum working pressure
• Compatible with 3/8 inch outside diameter tubing
• UNF thread standard for broad compatibility with standard hydraulic hardware

Compatibility

Designed as an OEM-style replacement or new-installation fitting for hydraulic and fluid power systems using 3/8 inch OD tubing with O-Ring Face Seal ORFS connections and UNF threading.

Installation Notes

Installation is typically performed by qualified hydraulic technicians or fluid power mechanics. Always depressurize and bleed the hydraulic system completely before removing or installing any fittings. Inspect the O-ring sealing surface for nicks or debris before assembly, as ORFS seals depend on a clean, undamaged face. Follow applicable industry standards for hydraulic fitting installation torque and ensure tubing is cut square and properly deburred before compression.