B K Mueller 586-040HN Black Pipe Nipple 1.25x4 in 5 Pack

Product Description

The B K Mueller Industries 586-040HN is a black steel pipe nipple measuring 1.25 inches in diameter and 4 inches in length. Pipe nipples serve as short threaded connectors used to join sections of pipe or to connect pipe to fittings, valves, and equipment. This nipple is finished in black, indicating standard carbon steel without galvanizing, which is common for gas distribution piping and certain mechanical systems. Licensed plumbers, pipefitters, and HVAC technicians install these as part of gas supply lines, steam systems, and industrial piping assemblies. Each package contains 5 pieces, making this suitable for multi-connection jobs or service van stock.

Black pipe nipples of this type are used in residential and commercial gas piping, low-pressure steam systems, and mechanical room piping. The 1.25-inch diameter suits branch lines and main feeds where moderate flow capacity is required. This nipple is a standard close-schedule component found in boiler rooms, furnace installations, and industrial process piping where galvanized fittings are not permitted by code or specification.

Key Features

• 1.25-inch nominal diameter with 4-inch length for standard short-run connections
• Black carbon steel construction suitable for gas and steam piping applications
• Threaded ends for direct connection to fittings, valves, and pipe sections
• Sold in a 5-piece package, convenient for multi-point installs
• Unit of measure sold individually as a pack of 5 (EA)

Compatibility

Designed as a standard black steel pipe nipple for use with 1.25-inch NPT-threaded fittings, valves, and pipe in gas, steam, and mechanical piping systems.

Installation Notes

Black steel pipe nipples are installed by licensed plumbers or pipefitters working under applicable codes such as the IFGC or ASME B31 piping standards. Always shut off the gas or fluid supply and depressurize the line before making or breaking any threaded connection. Apply an approved thread sealant or PTFE tape rated for the service fluid before threading the nipple into fittings. Do not over-tighten threaded connections, as this can crack cast fittings or damage threads.