Midland Industries 540544 Pipe Expander 1/4 in Nptf Steel

Product Description

The MIDLAND INDUSTRIES 540544 is a steel pipe expander fitting designed to transition between a 1/4-inch male NPTF connection and a 1/4-inch female NPTF connection within hydraulic and high-pressure fluid systems. The expander configuration accommodates a thread size change from 1/4-18 to 1/2-14, allowing technicians to adapt lines where thread pitch or port sizing differs between components. Rated to 4000 psi maximum operating pressure and 375 degrees F, this fitting is built for demanding hydraulic environments. The all-steel construction provides durability under pressure cycling and elevated temperatures. It is installed by plumbers, pipefitters, and hydraulic system technicians working on industrial or commercial fluid power assemblies.

This fitting is suited for hydraulic plumbing applications where a male NPTF port on one component must connect to a female NPTF port on another component with a different thread pitch. Its compact size makes it a practical inline adapter in tight manifold or panel installations. It belongs to the 5405 Series of MNPT to FNPT expander adapters and is categorized under steel pipe adapters for hydraulic service. The single-piece steel body keeps the connection count low, reducing potential leak points in pressurized systems.

Key Features

• 4000 psi maximum operating pressure for demanding hydraulic service
• 375 degrees F maximum operating temperature
• 1/4-18 male NPTF to 1/2-14 female NPTF thread configuration
• All-steel construction for strength under pressure cycling
• Compact body at 1.35 inches height and 0.70 inches width for tight installation spaces
• Part of the 5405 Series MNPT to FNPT expander line

Compatibility

Designed as an OEM-style replacement or new-installation adapter for hydraulic and high-pressure steel pipe assemblies requiring a 1/4-inch male NPTF to 1/4-inch female NPTF expander connection.

Installation Notes

This fitting is installed by qualified pipefitters, plumbers, or hydraulic system technicians. Depressurize and isolate the hydraulic circuit completely before removing or installing any fittings. Apply thread sealant rated for hydraulic service and the operating pressure of the system; do not use standard plumber tape on NPTF threads without verifying compatibility. Inspect mating threads for damage before assembly and torque to the fitting manufacturer recommendation for the pipe size and material.