Parker 16-12 Hlo-s Steel Tube Union Orfs 6000 Psi

Product Description

The PARKER 16-12 HLO-S is a steel compression tube union with O-Ring Face Seal (ORFS) end connections designed for high-pressure hydraulic and fluid transfer lines. It joins two tube lines of different outside diameters — 1 inch and 0.75 inches — using UNF-threaded ORFS fittings that provide a leak-resistant, vibration-tolerant seal. Rated to 6000 psi maximum working pressure, this fitting is built for demanding industrial and mobile hydraulic applications where a reliable tube-to-tube connection is required. Licensed plumbers, pipefitters, and hydraulic system technicians are the primary installers.

This union fitting is used in hydraulic systems, fluid power circuits, and high-pressure tubing assemblies found in industrial machinery, mobile equipment, and heavy-duty service applications. The ORFS end connections follow the SAE J1453 style interface, which relies on an O-ring seated against a flat face to create a positive seal without relying on thread engagement alone. The 16-12 size designation indicates the step-down union configuration from 1-inch to 3/4-inch tube outside diameter, making it suitable for reducer union applications in compact plumbing runs.

Key Features

• Steel construction for durability in high-pressure hydraulic service
• O-Ring Face Seal (ORFS) end connections for leak-resistant performance
• Rated to 6000 psi maximum working pressure
• UNF thread standard for compatibility with standard ORFS port tooling
• Tube outside diameter: 1 inch x 0.75 inches (step-down union)
• Overall length: 1.92 inches

Compatibility

Designed as an OEM-style replacement or service fitting for high-pressure hydraulic tube assemblies using O-Ring Face Seal connections with UNF thread standard and 1-inch by 3/4-inch tube outside diameters.

Installation Notes

Installation should be performed by a qualified pipefitter or hydraulic technician. Depressurize and isolate the hydraulic circuit fully before disassembly or fitting installation. Inspect the O-ring seating surface for nicks or contamination prior to assembly, and install a new O-ring if the original is damaged. Torque to the fitting manufacturer's published specifications for the connection size and do not over-tighten, as ORFS fittings seal via the O-ring face and not thread compression.