Half Coupling



More than 20 years experience in research and development.


Including around 50 R&D Personnel


Total factory is 50,000 square meters

About Us

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   Our products have been exported to customers all over the world and have won a good reputation for our excellent product quality and after-sales service. We warmly welcome domestic and foreign customers to contact us to discuss business, exchange information and cooperate with us.
For more details, please view our product catalogue and machine list.

  We have more than 1500 workers and have CNC lathes and CNC machining centers.
We are one of the best manufacturers and suppliers in China, choose quality manufacturers, suppliers, exporters at Ever-POWER.NET

half coupling professional manufacturer1
half coupling professional manufacturer3


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 end on one side. Socket welded half couplings can be welded directly to large diameter pipes to form branch connections.
It is used to take out 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 of half couplings, which require closer inspection for safety reasons.


Hoses are readily identifiable objects that connect using a 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.


What we do

1/4 in. 150# Stainless Steel Pipe Fitting Half Coupling 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 threaded 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 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



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