Parker 4-6 F5BU-S Straight Thread Connector 1/4 in Steel

Product Description

The PARKER 4-6 F5BU-S is a flareless bite-type tube connector designed for high-pressure hydraulic and fluid power applications. It features a straight-thread configuration with a 9/16-18 UN UNF thread size and accepts a 1/4 inch tube OD. Constructed from steel with a 24-degree flared angle seat, this fitting creates a secure, leak-resistant connection without requiring flared tubing ends. It is rated to 6,000 psi maximum working pressure, making it suitable for demanding industrial and mobile hydraulic systems. Licensed technicians and hydraulic system specialists handle installation in both OEM assembly and field service environments.

This connector is used in hydraulic lines, fluid power circuits, and instrumentation tubing runs where a straight-thread port connection is required. Its flareless bite-type design grips the tube mechanically, eliminating the need for pre-flaring the tube end. Typical applications include mobile equipment, industrial machinery, and other systems that operate at elevated pressures and require reliable metal-to-metal seals at threaded port connections.

Key Features

• Flareless bite-type design — no tube flaring required prior to assembly
• Rated to 6,000 psi maximum working pressure
• 9/16-18 UN UNF straight thread for positive port sealing
• Accepts 1/4 inch tube OD
• 24-degree flared angle seat for consistent metal-to-metal contact
• Steel construction for durability in high-pressure service

Compatibility

Designed as an OEM-style flareless bite-type straight-thread connector suitable for hydraulic and fluid power systems using 1/4 inch OD tubing with 9/16-18 UN UNF threaded ports.

Installation Notes

Installation is typically performed by hydraulic technicians or pipefitters familiar with flareless bite-type fitting assembly procedures. Before servicing any hydraulic line, depressurize the system completely and verify zero pressure before disconnecting or installing fittings. Use the correct hex size tool — 0.69 inches across flats — to torque the fitting without damaging the thread or seat. Follow the fitting manufacturer's assembly instructions for proper ferrule pre-setting to ensure a leak-free connection.