The pipe coupling is a short pipe with female threads at both ends for pipe connection. There are so many different types of couplings available and each one has its own specific application. For example, when connecting drop pipes in a good application, you may consider using merchant couplings to connect them together. Hebei Sanvo is one of the quality pipe coupling manufacturers and suppliers in China, exports and customizes steel merchant coupling.The threaded pipe coupling sizes are American standard 1/8"-6", German standard DN6-DN150, and other standard sizes, etc; The materials are in carbon steel and stainless steel; The surface finish is galvanized and black; The merchant coupling types include standard full merchant couplings, standard half merchant couplings, extra heavy full merchant couplings, and extra heavy half merchant couplings.

Galvanized Steel Full Merchant Coupling

China Pipe Coupling Manufacturers Customizable Galvanized Steel Merchant Coupling Thread...

API Line Galvanized Steel Pipe Coupling

China Pipe Coupling Manufacturers Carbon Steel Coupling Supplier Galvanized API 5L Line ...

Galvanized Steel Half Merchant Coupling

China Pipe Coupling Manufacturers High-Quality Galvanized Steel Merchant Coupling Thread...

Galvanized Extra Heavy Full Merchant Coupling

China Pipe Coupling Manufacturers Carbon Steel Merchant Coupling Galvanized Extra Heavy...

Galvanized Extra Heavy Half Merchant Coupling

China Pipe Coupling Manufacturers Carbon Steel Merchant Coupling Galvanized Extra Heavy ...

Black Steel Full Merchant Coupling

China Carbon Steel Coupling Manufacturer Steel Merchant Coupling Black Steel Full Mercha...

Black Threaded Half Merchant Coupling

China Pipe Coupling Manufacturers Carbon Steel Merchant Coupling Black Threaded Half Mer...

1 Inch Black Extra Heavy Full Merchant Coupling

China Pipe Coupling Manufacturers 1 Inch Steel Merchant Coupling Black Extra Heavy Full ...

NPT Black Extra Heavy Half Merchant Coupling

China Pipe Coupling Manufacturers Carbon Steel Merchant Coupling NPT Black Extra Heavy H...


The Ultimate FAQ Guide Of Pipe Couplings

This guide answers all the questions you have about pipe couplings. If you have been looking for information about steel pipe couplings, look no further.
You will find the most direct, yet detailed answers to basic questions, you often ask about steel merchant couplings.
Without further ado, here we go:

1. What Is A Pipe Coupling?

A coupling (or coupler) (used in piping or plumbing) is a very short length of pipe or tube, with a socket at one or both ends that allows two pipes or tubes to be joined, welded (steel), brazed, or soldered (copper, brass, etc.) together.

Alternatively, it is a short length of pipe with two female National pipe threads (NPT) (in North American terms, a coupler is a double female while a nipple is a double male) or two male or female British standard pipe threads.

If the two ends of coupling are of different standards or joining methods, the coupling is called an adapter. Examples of adapters include one end BSP threaded with the other NPT threaded, and one end threaded with the other a plain socket for brazing.

A coupling whose ends use the same connection method but are of different sizes is called a reducing coupling or reducer. An example is a 3/4" NPT to 1/2" NPT coupling.

Hebei Sanvo is one of the quality pipe coupling manufacturers and suppliers in China, and the pipe couplings are steel merchant couplings made of high-quality carbon steel or stainless steel, the coupling finish is black or galvanized, and the threaded pipe couplings include full merchant coupling and half merchant coupling.

2. What Is A Merchant Coupling?

There are so many different types of couplings available and each one has its own specific application. For example, when connecting drop pipes in a good application, you may consider using merchant couplings to connect them together.

Merchant couplings are manufactured according to ASTM A865 standard and are intended for use on steel pipe joints in accordance with ASME B1.20.1.

And merchant coupling dimension/size is 1/8"-6", standard full merchant coupling sizes 1⁄8" NPS through 2" NPS are straight-tapped. Sizes 2 1⁄2" NPS and larger are always taper-tapped.

Note:

What Is The Difference Between Straight Threads And Tapered Threads? 

1) First, it comes down to cost. Tapered threads cost more to manufacture while straight threads cost less to produce.
2) Second, tapered threads seal better. They seal better because the threads get tighter the further down the coupling, while straight threads stay the same width throughout.

All merchant couplings are chamfered before they are threaded. This means that before the threading is done, a chamfer is created. It can be tricky to tell where the threads start on the chamfer, but it helps start threading the pipe into the coupling.

3. Steel Merchant Coupling Typesmerchant coupling

1) Standard Full Merchant Couplings
2) Standard Half Merchant Couplings
3) Extra Heavy Full Merchant Couplings
4) Extra Heavy Half Merchant Couplings

4. What Is The Difference Between Full Coupling And Half Coupling?

The difference between full merchant coupling and half merchant coupling is the difference between threads. 

E.g:

1) Threaded Full Steel Merchant Coupling merchant coupling

1/8''-2'' Straight Tapped(NPS), 2.5''-6'' Taper Tapped(NPT).
Merchant Couplings in 2'' are available Taper Tapped as special.

2) Threaded Half Steel Merchant Coupling

1/8''-1''Taper Tapped(NPT), 1 1/4''-2'' Sraight Tapped(NPS), 2.5''-6'' Taper Tapped(NPT).
Merchant Couplings in 2'' are available Taper Tapped as special.

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