Midland Industries 66475 Hex Cap 1 in Fnpt Steel 150 Lb

Product Description

The MIDLAND INDUSTRIES 66475 is a 1-inch FNPT steel hex cap designed to close the end of a threaded pipe or fitting in plumbing, gas, and industrial piping systems. Constructed from zinc-plated steel and rated for 150 lb pressure class, it meets ASME B16.14-1991 dimensional standards. The hex outer profile allows installation with a standard pipe wrench or hex wrench, making it a straightforward field component for licensed plumbers, pipefitters, and HVAC technicians. The cap measures 1.16 inches in length with a 1.5-inch hex size and weighs 0.31 pounds.

This hex cap is suited for residential and light commercial piping applications where a threaded pipe end requires a secure, pressure-rated closure. Typical uses include capping unused branch outlets, service ports, or test ports on gas, water, or steam distribution systems. The zinc-plated finish provides basic corrosion resistance for indoor and sheltered outdoor installations. It carries a temperature rating of -20 to 350 degrees F, making it appropriate for a wide range of working conditions including low-pressure steam and hot-water systems.

Key Features

• 1-inch FNPT connection for standard threaded pipe systems
• 150 lb pressure class rating per ASME B16.14-1991
• Zinc-plated steel construction for corrosion resistance
• 1-11/2 thread specification for precise fit on 1-inch pipe
• Temperature range of -20 to 350 degrees F
• Hex outer profile for wrench installation

Compatibility

Designed as an OEM-style replacement or standard component for 1-inch FNPT threaded galvanized steel piping systems rated at 150 lb pressure class.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable IPC or IFGC codes. Depressurize and isolate the pipe section before threading on the cap. Apply thread sealant or PTFE tape to the male threads before installation. Do not overtighten, as this can damage the threads or crack adjacent fittings.