Parker 4-4 Cbu-s Bite-type Male Elbow 1/4 in Nptf Steel

Product Description

The PARKER 4-4 CBU-S is a flareless bite-type tube fitting in a 90-degree male elbow configuration, designed for high-pressure hydraulic and pneumatic plumbing lines. It connects a 1/4 inch OD tube to a 1/4 inch NPTF male thread, delivering a rated maximum working pressure of 5,000 psi. The bite-type design eliminates the need for pre-flaring the tube end, relying instead on a ferrule that bites into the tube wall on assembly to form a leak-resistant mechanical seal. Constructed from steel for durability in demanding service environments, this fitting is installed by hydraulic system technicians, industrial maintenance professionals, and fluid power specialists.

This fitting is suited for use in industrial hydraulic circuits, fluid power systems, and machine tool plumbing where a 90-degree directional change is required at a threaded port. The NPTF thread form provides a pressure-tight mechanical seal without relying solely on thread sealant. Its compact elbow geometry makes it practical in tight panel or manifold installations where straight fittings cannot route tubing efficiently. The 24-degree flared angle on the bite-type interface is consistent with standard flareless fitting specifications widely used in industrial and mobile hydraulic applications.

Key Features

• 90-degree elbow geometry routes 1/4 inch OD tubing at a right angle to a threaded port
• 5,000 psi maximum working pressure rating for high-pressure hydraulic service
• Flareless bite-type design eliminates pre-flaring; ferrule bites into tube on assembly
• 1/4 inch NPTF male thread provides a pressure-tight port connection
• 24-degree flared angle conforms to standard flareless fitting interface geometry
• Steel construction for strength and durability in industrial service conditions

Compatibility

Designed as an OEM-style replacement or new-installation flareless bite-type fitting for industrial hydraulic and pneumatic tubing systems using 1/4 inch OD tube and 1/4 inch NPTF threaded ports rated to 5,000 psi.

Installation Notes

Installation should be performed by a qualified hydraulic or fluid power technician. Depressurize and isolate the system completely before removing or installing any fitting. Inspect the tube end for squareness and freedom from burrs before inserting into the fitting body, as bite-type fittings require a clean, undamaged tube end for a proper ferrule bite. Apply thread sealant compatible with the system fluid to the NPTF threads per shop practice, and tighten to the fitting manufacturer's recommended procedure for flareless assemblies.