Midland Industries 57225 Welded Pipe Nipple Sch 40 4in Mpt

Product Description

The MIDLAND INDUSTRIES 57225 is a black steel welded pipe nipple designed for threaded pipe assemblies in plumbing, HVAC, gas distribution, and industrial piping systems. It features 4-inch male pipe threads (MPT) on both ends with a 5-inch body length, making it a close nipple suitable for tight-run installations. The wall thickness measures 0.237 inches at Schedule 40, and the pressure class rating is 150 lb at up to 2,210 psi working pressure. Licensed plumbers, pipefitters, and HVAC technicians install this fitting as part of black steel piping runs for gas, steam, or water service. It conforms to ANSI B1.20.1 thread dimensional standards.

This nipple is suited for residential and light commercial piping applications where black steel Schedule 40 pipe is specified. Common uses include natural gas supply lines, steam systems, and hydronic heating distribution runs. The black steel finish is standard for interior gas piping per applicable fuel gas codes. The 4-inch diameter makes this a larger-diameter fitting typically found in commercial mechanical rooms, boiler rooms, and high-volume gas supply headers. Installers working on these systems will find the standard MPT threading compatible with Schedule 40 black steel pipe and fittings throughout the assembly.

Key Features

• 4-inch MPT x 4-inch MPT both ends for straightforward threaded inline connections
• Schedule 40 wall thickness of 0.237 inches rated to 2,210 psi working pressure
• 150 lb pressure class with an operating temperature range of -200 to 150 degrees F
• Thread pitch conforms to ANSI B1.20.1 for consistent fit with standard black steel fittings
• 1.74-inch thread engagement length on each end for full-depth makeup
• Black steel finish appropriate for natural gas and steam piping service

Compatibility

Designed as an OEM-style replacement or standard supply fitting for Schedule 40 black steel threaded piping systems using 4-inch NPT connections.

Installation Notes

Installation of this fitting is performed by licensed plumbers or pipefitters. Shut off and bleed down the gas or fluid supply before breaking any connection in the line. Apply appropriate thread sealant or PTFE tape rated for the service medium before making up threads. All gas piping work must comply with the International Fuel Gas Code (IFGC) or applicable local codes, and pressure testing of the completed assembly is required before returning the system to service.