Midland Industries SS5406-HHP-16 Hollow Hex Head Plug

Product Description

The MIDLAND INDUSTRIES SS5406-HHP-16 is a hollow hex head pipe plug designed for high-pressure and high-temperature fluid or gas line applications. Machined from 316 stainless steel, it provides strong corrosion resistance in demanding service environments. The plug features a 1-inch male NPTF connection and is rated for a maximum operating pressure of 11,000 psi and temperatures up to 1,000 degrees F. It is used by plumbers, pipefitters, and industrial maintenance technicians to cap or test threaded pipe ends in systems where sealing integrity under extreme conditions is required.

This plug is suited for industrial piping systems, hydraulic lines, and process piping where stainless steel is specified for corrosion resistance or sanitary requirements. The NPTF thread form provides a dry-seal connection, reducing the need for additional thread sealant in many applications. Typical installs include capping unused ports on manifolds, pressure test points, and high-pressure hydraulic or pneumatic fittings in both commercial and industrial settings.

Key Features

• 316 stainless steel construction for excellent corrosion resistance in harsh or wet environments
• Maximum operating pressure of 11,000 psi for high-pressure system compatibility
• Rated to 1,000 degrees F for high-temperature service
• Male NPTF dry-seal thread form for reliable pressure-tight connections
• 1-inch connection size fits standard NPT pipe and fittings
• Hollow hex head design allows engagement with standard hex or socket drive tools

Compatibility

Designed as an OEM-style replacement or add-on fitting for industrial and commercial piping systems using 1-inch female NPTF-threaded ports, including hydraulic, pneumatic, and process fluid applications requiring 316 stainless steel construction.

Installation Notes

Installation should be performed by a qualified pipefitter or plumber following applicable codes such as the IPC or ASME B31 piping standards. Depressurize and isolate the line completely before removing or installing any pipe plug. Use a properly sized hex or socket drive tool to engage the hollow hex head and avoid rounding the fitting. Apply thread sealant or PTFE tape as appropriate for the service medium, unless the NPTF dry-seal thread form provides adequate sealing for the application.