Half Coupling


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EP is a supplier of threaded full tube half couplings that utilize completely different business applications such as chemical processing, refinery, petrochemical and many other industries. We have a large inventory of fully threaded rod half couplings, which can be customized according to customer needs. We specialize in the manufacture of ASME B16.11 threaded half couplings to ASME B16.11 / BS 3799. Full Half Couplings to B16.11 Standard ASME B16.11 covers pressure-temperature evaluation, dimensions, markings, tolerances and material prerequisites. Based on dimensional requirements, check ASTM A182 SS Threaded Full Half Couplings before purchasing.

What is half coupling?

  Half couplings are used for small-bore branches from vessels or large-bore pipes. It can be threaded or socketed. It only has a socket or threaded half-coupling end on one side. Half couplings socket welded can be welded directly to large diameter pipes to form branch connections.
It removes small-diameter pipe branches from large-diameter pipes where the pipe specification requires small-diameter socket welding. The threaded half coupling has only one threaded end, and the other end of the half coupling should be the butt-welded end of the flat or beveled end.
Half Coupling halves are widely used in the aerospace industry as connectors for pressurized fuel lines. Launches of various space shuttles are often delayed because aluminum half couplings require closer inspection for safety reasons.


Hoses are readily identifiable objects that connect using a aluminum half coupling. The threaded end is screwed onto a faucet, while the other end is clamped onto the hose. With piping, one end of a half-coupling is screwed onto the pipe, while the other end is made to be tightly inserted, or welded, onto the other end.

Half Coupling Types

Half couplings come in male and female varieties. The male half-couplings have external threads that the pipe fits over. Female half-couplings have internal threads. The piping is inserted and twisted to secure the connection.

Half Coupling Installation

Unlike other plumbing fittings, coupling halves are only threaded on one end. It is usually used to install small-bore branches of large-bore pipes. It also serves as a connector for pressurized fuel lines. It is also widely used in the aerospace industry.

There are two types of coupling halves, male and female. External threads have external threads at both ends, and internal threads have internal threads at both ends. Both types of threads can be sealed or welded. Threaded joints are usually sized according to the diameter of the insertion tube. Threaded joints must comply with Section U-10 of the Code, Table U-8, and Figure U-10. The insertion tube should not exceed six inches in diameter.

These couplings are often used on small process feeders in large power circuits. They have simple degradation profiles. They also have two different sizes of threads on each side. They are used to install small diameter fittings and hoses. They are also used in automated factories.

Half Coupling Vs Full Coupling

There are several types of couplings on the market. These fittings are used to connect two pipes. They are made of different materials. They also come in different sizes. Selection depends on application and operating conditions. It is important to choose a coupling with the right material so that it does not break. It is also important to choose a material that is compatible with the pipe. Choosing the wrong coupling type can result in leaks and shorten the life of the coupling.

Half joints are used to connect two pipes. They have sockets on one end. They are made of steel or SS316. They are used in various applications such as plumbing, fire protection and aerospace. These fittings are commonly used on pressurized fuel lines as well as air and water lines.

What Does an Inch and a Half Coupling Look Like?

During plumbing installation, two or more pipes are combined using one-and-a-half-inch fittings. These fittings are usually threaded. Threads create a tighter seal. They are typically used in light-duty plumbing applications. They are easy to install. They can be converted to compression fittings if desired. These fittings have a gasket on either side. They are often used in automated factories. They also work well in fire protection systems.

The difference between a one-and-a-half-inch coupling and a compression fitting is size. Compression fittings have gaskets on both sides. Insulated adapters connect nominal pipe to copper pipe. Insulated adapters also require a loosely coupled connection when the pipe is pushed into the pipe.

Threaded half coupling halves are used in several industries. It is used in air and water lines and pressurized fuel lines. It is also used in automating factories and textile machinery. It is made of alloy steel and can withstand up to 3000 lbs of pressure. It is available in various sizes. Its wall thickness is directly related to its pressure vessel.

What is the Difference Between Half Coupling and Full Coupling?

During the installation of the piping system, a coupling half can be used to connect two pipes. These fittings are typically used for smaller-diameter pipe connections. They are also used as connectors in pressurized fuel piping systems. There are many different types of couplings available for various applications. They include thread and socket types.

The half joints are usually welded into the holes in the header tank. The other end is screwed onto the pipe. Couplings help in connecting two pipes and also in terminating them. They are commonly used in air and water lines and fire protection systems. They can also be used for branch connections.

Coupling halves come in different styles, sizes and materials. Threaded coupling halves are the most common. These are usually made of alloy steel for excellent strength and corrosion resistance. They are available in a variety of sizes, from 1/2″ to 48″. Some have beveled ends, or are threaded on both ends.


What We Do

1/4 in. 150# Stainless Steel Half Coupling Pipe Fitting 304 SS NPT Threaded

This threaded NPT HALF coupling is typically what you’d have welded into your vessel as the bulkhead for thread in sight glasses, dial thermometers, etc. The half coupling gives you female threads on ONLY ONE END. An alternative to a half coupling would be a weld spud, especially if you plan to use silver solder rather than welding.

Available in 1/2″ and 1/4″ NPT sizes.

Made from cast 304 stainless steel. Note that the outside finish on these is typically MATTE or cast finish meaning that it has not been machined to shiny.

The 1/2″ half couplings measure approximately 1.06″ outside diameter.
The 1/4″ half couplings measure approximately .75″ outside diameter.

It’s always best to measure them in person if you’re trying to have them fit snug in a drilled hole for welding.

  • 304 stainless steel castings conform to ASTM A351 ACI Grade CF8
  • 316 stainless steel casting conform to ACI Grade CF8M (316)
  • NPT threads on pipe fittings conform to ASME B1.20.1
  • Manufacturing facility is ISO 9001:2008
  • Certified pipe fittings meet applicable chemical & mechanical properties
  • Quality guarantee on all pipe fittings

ASME B16.11 Half Coupling

  Marcel Piping is a renowned manufacturer of ASME B16.11 Couplings, a drill pipe threaded joint that provides high strength for threaded connections. We offer threaded half couplings to help withstand multiple tightening cycles that can lead to loose threads. Drilling process. Threaded joints can be welded to the pipe or screwed to the pipe upon request and are manufactured to national and international quality standards.

  We are also a supplier of half couplings ANSI B16.11 for applications in different industries such as chemical processing, refinery, petrochemical and many other industries. We have a large inventory of forged steel half couplings, which can be customized to size according to customer requirements. We specialize in manufacturing ASME B16.11 half coupling dimensions to ASME B16.11 / BS 3799. B16.11 compliant threaded half coupling dimensions cover pressure-temperature ratings, dimensions, markings, tolerances and material requirements. Check the threaded half coupling size before purchasing, based on dimensional requirements.

1 in. Threaded NPT Half Coupling 316/316L 3000LB Stainless Steel Pipe Fitting

  • Forged stainless steel material conforms to ASME A182
  • Forged Stainless Steel Pipe Fitting dimensions conform to ASME B16.11
  • NPT threads conform to ASME B1.20.1
  • Socket weld fittings conform to ASME B16.11
  • Forged stainless union conform to MSS SP-83
  • Forged stainless outlets conform to MSS SP-97
  • Forged stainless socket weld inserts conform to MSS SP-79
  • Manufacturing facility is ISO 9001:2008
  • half coupling

SS Threaded Half Coupling


  • Half Coupling dimensions and half coupling materials conform to ASTM A865
  • Half Coupling threads conform to ASME B1.20.1
  • Half Couplings from 1/8” to 2” are NPSC (straight threads), 2-1/2” and larger are NPT (tapered)
  • API 5L style half couplings are for extra heavy pipe, all sizes have NPT threads
  • Steel bushings and plugs conform to ASME B16.14
  • half coupling



Each Piece of Coupling is Cleaned and Arranged Anti-rust Oil Carefully, Before Delivery, to Protect Against Corrosion

before delivery, arrange marking as per standard or customized

offer oem service. each piece of coupling was tested before delivery, otherwise will not load

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