Midland Industries SS6405-06-06 3/8 in Orb X Fnptf Adapter

Product Description

The MIDLAND INDUSTRIES SS6405-06-06 is a straight pipe adapter machined from 316 stainless steel, designed to transition between a 3/8-inch Male O-Ring Boss (ORB) port and a 3/8-inch Female NPTF thread. The 9/16-18 male ORB end creates a pressure-tight seal against a machined boss seat, while the 3/8-18 female NPTF end accepts tapered pipe threads for a leak-free mechanical connection. At 1.33 inches in length and rated to 1000 degrees F, this fitting is built for demanding fluid and gas transfer applications where corrosion resistance and high-temperature performance are required. Plumbers, pipefitters, and hydraulic technicians install this adapter to bridge ORB-ported components with standard NPTF-threaded pipe runs.

This adapter is suited for use in hydraulic systems, industrial fluid lines, and high-temperature process piping where 316 stainless steel is specified for corrosion resistance. The ORB-to-FNPTF configuration is common when connecting pumps, valves, or manifolds with O-Ring Boss ports to threaded pipe assemblies. It is appropriate for both residential and commercial installations requiring a compact, reliable transition fitting in tight spaces or high-vibration environments.

Key Features

• 316 stainless steel construction for superior corrosion resistance in aggressive media and outdoor environments
• 1000 degrees F maximum operating temperature for high-heat process and industrial applications
• 3/8-inch Male O-Ring Boss (9/16-18 thread) provides a positive, leak-resistant boss-seat seal
• 3/8-inch Female NPTF (3/8-18 thread) accepts standard tapered pipe threads with mechanical seal
• Compact 1.33-inch body length fits confined plumbing and hydraulic installation spaces
• Part of the SS6405 Series, purpose-built for Male O-Ring to Female NPT transitions

Compatibility

Designed as an OEM-style replacement or new-installation fitting for systems requiring a 3/8-inch Male O-Ring Boss to 3/8-inch Female NPTF adapter in 316 stainless steel construction.

Installation Notes

Installation is performed by licensed plumbers or pipefitters following applicable IPC and IFGC guidelines. Depressurize and drain the system fully before removing or installing any fittings. The Male ORB end relies on an O-ring against a machined boss seat for its seal - inspect the seating surface and install a new O-ring if the original shows wear or damage. Apply appropriate thread sealant to the NPTF threads only; do not apply sealant to the ORB seating surface.