Parker PT-00557 Flareless Bite-type Tube Union 8mm Steel

Product Description

The PARKER PT-00557 is a flareless bite-type tube union designed for straight-through connections in high-pressure hydraulic and instrumentation tubing systems. Built from steel, this union accepts 8 mm outside diameter tubing and is rated for a maximum working pressure of 500 bar. The bite-type design eliminates the need for flared tube ends, using a ferrule that bites into the tube wall to create a reliable, leak-resistant seal. It is sized with a 14 mm hex for standard wrench engagement. Hydraulic technicians, industrial maintenance pipefitters, and fluid power specialists install this fitting in demanding high-pressure fluid or pneumatic circuit applications.

This fitting is suited for use in industrial, mobile hydraulic, and fluid power systems where flareless tube connections are required. The straight union configuration joins two runs of 8 mm OD tubing in a single inline path. It is appropriate for both new installation and replacement service on hydraulic power units, machine tool circuits, and process instrumentation lines. The steel construction supports use in environments where high working pressures and mechanical durability are primary concerns.

Key Features

• Flareless bite-type design eliminates tube flaring during assembly
• Rated to 500 bar maximum working pressure
• Accepts 8 mm outside diameter tubing
• Straight union configuration for inline tube-to-tube connection
• 14 mm hex size for standard wrench engagement
• Steel construction for high-pressure mechanical durability

Compatibility

Designed as an OEM-style flareless bite-type union for use with 8 mm OD steel tubing in high-pressure hydraulic and instrumentation plumbing systems.

Installation Notes

Installation should be performed by a qualified hydraulic technician or industrial pipefitter. Depressurize and isolate the hydraulic or fluid circuit completely before disconnecting any existing fittings or tubing. Ensure tube ends are cut cleanly and squarely, and that tubing is properly inserted to the tube stop before tightening the nut to allow the ferrule to bite correctly. Follow the fitting manufacturer's prescribed assembly procedure for bite-type fittings, as over-tightening can damage the ferrule or tube wall.