Midland Industries 50004 Steel Pipe Coupling 1/4 in Nptf

Product Description

The MIDLAND INDUSTRIES 50004 is a steel pipe coupling designed to join two female NPTF threaded lines in hydraulic and high-pressure fluid systems. Both ports accept 1/4-inch female NPTF connections with a 1/4-18 thread specification, conforming to SAE dimension standard 140138. The coupling handles a maximum operating pressure of 4000 psi and is rated for temperatures up to 375 degrees F, making it suitable for demanding hydraulic circuits where leak-free thread engagement is critical. Plumbers, pipefitters, and hydraulic system technicians install this fitting in applications requiring a straight union between two female-threaded lines.

This coupling is used in hydraulic plumbing assemblies, fluid power systems, and high-pressure steel pipe installations. Its all-steel construction withstands the mechanical and thermal stress common in industrial and mobile hydraulic environments. The NPTF thread form provides a dry-seal connection that minimizes reliance on thread sealant, which is an advantage in systems where contamination control matters. Typical installations occur in industrial machinery, hydraulic power units, and fluid transfer lines where a compact, straight coupling is needed between two fixed female ports.

Key Features

• 4000 psi maximum operating pressure rated for high-pressure hydraulic service
• Dual 1/4-inch female NPTF ports with 1/4-18 thread form for dry-seal engagement
• Rated to 375 degrees F for use in elevated-temperature fluid systems
• Steel construction for durability in hydraulic and fluid power applications
• Conforms to SAE dimension standard 140138
• Compact profile at 1 inch length for tight-clearance installations

Compatibility

Designed as an OEM-style replacement or service fitting for steel hydraulic pipe assemblies using 1/4-inch female NPTF threaded connections conforming to SAE 140138 dimension standards.

Installation Notes

Installation should be performed by a licensed pipefitter, plumber, or qualified hydraulic technician. De-pressurize and isolate the hydraulic circuit completely before removing or installing any fitting. NPTF threads are designed for dry-seal connections, but consult system specifications before applying thread sealant. Verify that operating pressure and temperature in the target system do not exceed the rated limits of this fitting before placing the system back in service.