Midland Industries 6404-14-12 Straight Adapter Orb X Nptf

Product Description

The MIDLAND INDUSTRIES 6404-14-12 is a straight hydraulic adapter designed to connect a 7/8-inch Female O-Ring Boss (ORB) port to a 3/4-inch Male NPTF thread. Constructed from steel, this fitting provides a reliable, leak-resistant transition between ORB and NPTF connections in hydraulic plumbing systems. The O-Ring Boss end seats against a face O-ring for a positive seal, while the NPTF male end relies on thread interference for a dry-seal connection. At 0.45 pounds, it is compact enough for tight installations without sacrificing durability. This adapter is handled and installed by hydraulic systems technicians, industrial maintenance mechanics, and fluid power specialists.

This fitting is suited for use in hydraulic circuits found in mobile equipment, industrial machinery, and fluid power systems where a port-to-pipe thread transition is required. It is commonly installed at pump ports, valve bodies, manifolds, and cylinder connections where an ORB boss port must interface with NPTF-threaded lines or components. The 6404 Series is specifically designed for female O-Ring to male NPTF applications in steel pipe adapter configurations within hydraulic systems.

Key Features

• 7/8-inch Female O-Ring Boss inlet provides a face-seal connection that reduces leak paths in hydraulic circuits
• 3/4-inch Male NPTF outlet creates a dry-seal thread-to-thread connection without requiring sealant tape
• Steel construction withstands high-pressure hydraulic service and resists deformation under torque
• Straight adapter body simplifies routing where a direct in-line transition is needed
• Compact footprint measures 2 inches in length and 1.65 inches in width for installation in confined spaces

Compatibility

Designed as an OEM-style straight adapter for hydraulic systems requiring a 7/8-inch Female O-Ring Boss to 3/4-inch Male NPTF transition, consistent with SAE and NPTF plumbing standards used in mobile and industrial hydraulic applications.

Installation Notes

This fitting should be installed by a qualified hydraulic technician or fluid power mechanic familiar with SAE O-Ring Boss and NPTF thread standards. Depressurize and isolate the hydraulic circuit completely before removing or installing any fittings. Inspect the O-ring for damage before assembly and replace it if worn; do not reuse a damaged O-ring. NPTF threads are designed for dry-seal assembly, but consult the system manufacturer's specifications before applying thread sealant.