Midland Industries 63771 Half Coupling 1/4 in Npt 316 Ss 150 Lb

Product Description

The MIDLAND INDUSTRIES 63771 is a half coupling fitting designed for small-bore piping connections in industrial and commercial plumbing systems. One end accepts a 1/4 in female NPT threaded connection using a 1/4-18 thread form, while the other end is configured for socket weld attachment. Constructed from 316 stainless steel, this fitting delivers strong corrosion resistance in environments exposed to moisture, mild acids, and chlorides. Rated at 150 lb pressure class, it suits a range of low-to-medium pressure fluid and gas piping applications. The compact body measures approximately 0.8 inches wide by 0.6 inches long, and the fitting weighs 0.015 pounds. Plumbers and pipefitters install this fitting where a threaded port must be joined to a welded pipe run.

The 63771 half coupling is suited for residential mechanical rooms, light commercial piping systems, and industrial process lines where 316 stainless steel is specified for corrosion resistance. Its dual-end configuration makes it practical in retrofit situations where one existing connection is threaded NPT and the transition to a welded joint is required. It falls within the 150-lb fitting category, which covers standard service pressures common in water, steam, and compatible fluid systems. Licensed plumbers and certified pipefitters are the typical trades handling this fitting type.

Key Features

• 316 stainless steel construction for excellent corrosion and chloride resistance
• 1/4 in female NPT inlet with 1/4-18 thread for standard threaded pipe connections
• Socket weld outlet for a permanent, leak-resistant welded joint
• 150 lb pressure class rating suitable for standard service piping
• Compact dimensions: 0.8 inches wide x 0.6 inches long x 0.45 inches tall
• Lightweight at 0.015 pounds, minimizing load on small-bore piping assemblies

Compatibility

Designed as a standard 150 lb half coupling for 1/4 in small-bore stainless steel piping systems requiring a female NPT-to-socket-weld transition.

Installation Notes

This fitting is typically installed by a licensed plumber or certified pipefitter. Shut off and depressurize the piping system completely before beginning work. The socket weld end requires proper fit-up and welding by a qualified welder in accordance with applicable codes such as ASME B31.1 or B31.3. Apply appropriate thread sealant or PTFE tape to the NPT end per the job specification and local code requirements.