Parker PT-00559 Flareless Bite-type Tube Union 12mm Steel

Product Description

The PARKER PT-00559 is a flareless bite-type tube union designed for straight inline tube connections in high-pressure hydraulic and instrumentation systems. Built from steel, this union accepts 12 mm outside diameter tubing and holds a maximum working pressure of 400 bar. The bite-type design uses a ferrule that bites into the tube wall during assembly, eliminating the need for pre-flaring. Installation is straightforward and repeatable, making it a reliable choice for field and shop assembly on industrial fluid lines. Licensed plumbers, pipefitters, and hydraulic system technicians are the primary installers for this type of fitting.

This fitting is suited for use in hydraulic circuits, instrumentation tubing runs, and fluid power systems where a secure, leak-resistant union is required without a flared tube end. The straight configuration keeps the flow path direct, making it appropriate for panel-mounted assemblies, machine tool plumbing, and process control lines operating at elevated pressures. Its compact overall length of 28 mm keeps installation envelopes tight in confined spaces.

Key Features

• Flareless bite-type design eliminates pre-flaring of tube ends
• Rated to 400 bar maximum working pressure
• Accepts 12 mm outside diameter tubing
• Straight union configuration for inline tube-to-tube connections
• Steel construction for durability in high-pressure hydraulic environments
• 19 mm hex size for standard wrench engagement during assembly

Compatibility

Designed as an OEM-style replacement or service fitting for industrial hydraulic and instrumentation tube assemblies using 12 mm OD tubing with flareless bite-type connections.

Installation Notes

Installation is performed by licensed pipefitters or hydraulic system technicians familiar with flareless compression fitting assembly procedures. Depressurize and isolate the hydraulic or fluid circuit completely before disassembling any existing tube connections. Follow the fitting manufacturer assembly procedure for ferrule pre-setting to ensure proper bite and seal. Applicable installations should conform to relevant fluid power and piping codes for the system operating pressure.