Midland Industries 59146SMLS Seamless Pipe Nipple Sch 80

Product Description

The MIDLAND INDUSTRIES 59146SMLS is a seamless steel pipe nipple rated for demanding black-iron piping applications. It features male pipe thread (MPT) connections on both ends at 1-1/2 inches, with an overall length of 4-1/2 inches and a 1-1/2-inch diameter. Wall thickness is 0.2 inches at Schedule 80, giving it a 300 lb pressure class rating of 1900 psi. The black steel construction is standard for gas distribution, compressed air, and industrial fluid systems. Licensed plumbers and pipefitters install this type of fitting in both residential and commercial settings wherever a short-run threaded connection is required.

This nipple is suited for gas supply lines, compressed air headers, hydraulic systems, and general black-iron pipe assemblies. Its Schedule 80 extra-heavy wall construction makes it appropriate for higher-pressure runs where standard Schedule 40 wall thickness is insufficient. The fitting conforms to ANSI B1.20.1 thread standards, ensuring consistent thread engagement with NPT-compatible valves, tees, elbows, and other fittings. It is typically found in commercial mechanical rooms, industrial process piping, and residential gas rough-in work.

Key Features

• Schedule 80 extra-heavy seamless steel construction rated to 1900 psi at 300 lb pressure class
• 1-1/2-inch MPT x 1-1/2-inch MPT connections with 1-1/2-11-1/2 thread form per ANSI B1.20.1
• Thread engagement length of 1.03 inches and wall thickness of 0.2 inches
• Black steel finish compatible with standard black-iron gas and fluid piping systems
• Operating temperature range of -200 to 150 degrees F
• Seamless pipe body eliminates weld seam, reducing potential leak paths under pressure

Compatibility

Designed as an OEM-style replacement or new-installation fitting for black-iron Schedule 80 seamless pipe systems using 1-1/2-inch NPT-threaded components conforming to ANSI B1.20.1.

Installation Notes

Installation is performed by licensed plumbers or pipefitters following applicable codes such as the International Fuel Gas Code (IFGC) or International Plumbing Code (IPC). Shut off and depressurize the line completely before removing or installing any threaded fitting. Apply an approved thread sealant or PTFE tape rated for the service medium to all male threads before assembly. Do not over-tighten; use pipe wrenches of appropriate size and follow the fitting manufacturer's recommended engagement turns.