Midland Industries 6405O64 Male O-ring Fnptf Adapter Steel

Product Description

The MIDLAND INDUSTRIES 6405O64 is a male O-ring boss to female NPTF pipe adapter designed for hydraulic plumbing applications. This steel fitting connects a 3/8-inch male O-ring boss port to a 1/4-inch female NPTF thread, providing a reliable leak-resistant transition between two common hydraulic connection types. Rated to 3600 psi maximum operating pressure and capable of handling temperatures up to 375 degrees F, this adapter is built for demanding fluid power systems. It is a compact, single-piece steel fitting installed by hydraulic technicians and industrial plumbers during system assembly or component replacement.

The 6405O64 is suited for use in hydraulic circuits where an O-ring boss port on a valve, manifold, pump, or cylinder must transition to a female NPTF pipe thread connection. It is part of the 6405 Series and applies to steel pipe adapter configurations in industrial and mobile hydraulic systems. The NPTF thread form provides a dry-seal connection, reducing reliance on sealants when properly assembled.

Key Features

• 3/8-inch male O-ring boss inlet to 1/4-inch female NPTF outlet configuration
• 3600 psi maximum operating pressure for high-pressure hydraulic service
• Rated to 375 degrees F operating temperature
• Steel construction for durability in industrial and mobile hydraulic environments
• NPTF dry-seal female thread minimizes fluid leakage at the pipe connection
• Compact form factor - 1.4 inches wide, 0.75 inches in length

Compatibility

Designed as an OEM-style replacement or new-installation fitting for hydraulic systems using 3/8-inch male O-ring boss ports and 1/4-inch female NPTF pipe thread connections in industrial and mobile hydraulic plumbing circuits.

Installation Notes

Install and service hydraulic fittings only after depressurizing and bleeding the hydraulic circuit completely. This fitting is intended for installation by qualified hydraulic technicians or industrial plumbers familiar with O-ring boss and NPTF thread assembly practices. Hand-tighten the O-ring boss end onto a clean, undamaged port seat before applying final torque; inspect the O-ring for damage before assembly. NPTF connections rely on thread-form engagement for sealing - consult system documentation for acceptable thread sealant use on the pipe side.