Midland Industries 6410O46 1/4 Morb X 3/8 Forb Steel Reducer

Product Description

The MIDLAND INDUSTRIES 6410O46 is a steel SAE O-ring boss reducer/expander adapter designed for hydraulic plumbing applications. It transitions between a 1/4-inch Male O-Ring Boss (MORB) connection and a 3/8-inch Female O-Ring Boss (FORB) connection, allowing technicians to step up or step down line sizes within a hydraulic circuit. The adapter is rated to 4500 psi working pressure and can handle operating temperatures up to 375 degrees F. Thread specifications are 7/16-20 on the male end and 9/16-18 on the female end. It is installed by hydraulic technicians and maintenance professionals working on mobile or industrial hydraulic systems.

The 6410O46 is suited for use in steel-line hydraulic assemblies where a size transition between SAE O-ring boss ports is required. Typical applications include mobile equipment, agricultural machinery, construction equipment, and industrial hydraulic power units where a 1/4-inch MORB supply or return line must interface with a 3/8-inch FORB port or vice versa. Its compact dimensions make it practical in space-constrained manifold or valve-block installations.

Key Features

• 4500 psi maximum working pressure for demanding hydraulic service
• 375 degrees F maximum operating temperature rating
• SAE O-ring boss sealing on both ends minimizes leak risk compared to tapered-thread fittings
• Steel construction for durability in high-pressure hydraulic circuits
• 7/16-20 male thread x 9/16-18 female thread for standard SAE sizing
• Compact body: 2.25 inches in length, 0.9 inches wide, 0.85 inches in height

Compatibility

Designed as an OEM-style SAE O-ring boss adapter for steel hydraulic line assemblies requiring a 1/4-inch MORB to 3/8-inch FORB size transition.

Installation Notes

Installation should be performed by a qualified hydraulic technician. Depressurize and isolate the hydraulic circuit fully before removing or installing any fittings. O-ring boss fittings rely on a properly seated O-ring for sealing - inspect and replace the O-ring if worn or damaged before assembly. Tighten to the fitting manufacturer's recommended torque range for the applicable SAE standard; do not over-tighten, as this can damage the sealing surface.