Hi, every purchaser and reader, I would like to introduce myself first. We are a pipe fittings manufacturer from China, with our own factory.
Today, we will talk about and advertise our two main plumbing fittings: pipe nipples and pipe couplings.
This article aims not just to sell; we also intend to provide truly useful information.
What is a Pipe Nipple?
A pipe nipple is a short length of pipe with male threads on both ends or one end. It connects with other female-threaded pipe fittings and extends pipeline length.
Key Characteristics:
- Male threads on one or both ends
- Extend the plumbing overall lengths
- Sizes from 1/8 to 12 inches
- Straight, short
- Thread types: NPT, BSP, DIN, BSPT
Types of Pipe Nipples:
Close Nipple
Threads nearly end-to-end with minimal unthreaded center.
Is the shortest pipe nipple type.
Used when minimum spacing is required.
Shoulder Nipple
Short unthreaded section at the center of both threaded ends.
Length between close nipple and barrel nipple.
Barrel Nipple
It has a longer barrel (unthreaded) middle part between both threaded ends; it is one of the most standard pipe nipple types.
It has the best strength; it is used where the middle part of two pipe fittings needs more space between.
Barrel nipples come in special customized types, with one long threaded end and one shorter threaded end. We can customize the type according to customer requirements.
Hex Nipple
The hex nipple has no barrel part; it has a hex part in the middle of both ends, similar to a nut.
The middle part is designed for installation with a wrench.
Welding Nipple
The welding nipple has only one threaded end; the other end is plain for welding installation.
The unthreaded end can be used to undergo bevel treatment.
Above are common pipe nipple types; besides, pipe nipples have some special types.
King Nipple
One end is male threaded, and the other is a hose shank end.
This design transitions a threaded pipe fitting connected to a hose pipe.Hose Nipple
It is an updated type of king combination nipple; the hose nipple has a hex nut section in the middle, the force point for wrench installation.
This design can prevent damage to the hose pipe surface during installation.
But because of this hex part, the king nipple provides more strength than a hose nipple.Hex Reducing Nipple
It is a different-diameter-end hex nipple with a hex part in the middle, commonly used to connect different-sized pipelines, and needs to be removed with a wrench.
Comparison Table
| Types | End Forms | Strength/Characteristics | Main Type Selection Considerations |
|---|---|---|---|
| Close Nipple | Both male threads and no unthreaded part. | Lowest strength | For extremely limited and short-distance connections. |
| Shoulder Nipple | Both male threads and a short unthreaded middle. | Medium Strength | Short to medium distance, compatible with strength. |
| Barrel Nipple | Both male threads, with the same threaded length. | Highest strength | Full size range, and suitable for various spatial distances. |
| Barrel Nipple（Customized different threaded length on both ends） | Both ends are male threads; the special feature is the different thread lengths. | Need to be customized | |
| Hex Nipple | Both male threads, hex middle part | Depends on the material | For where you need to remove and install frequently, for wrench installation. |
| Reducing Hex Nipple | Similar to hex nipple, but both ends have different diameters. | Depends on the material | For where space needs a reducer connection. |
| Welding Nipple | One threaded, and the other is a plain end for welding. | According to welding performance. | Transitional connection of threaded to welding. |
| King Nipple (KC Nipple) | One male threaded end and one hose shank. | Strong grip on the pipe. | For applications where threaded pipe transitions to a hose. |
| Hose Nipple (Hose Barb) | One male threaded and one barbed hose end, with a hex middle part. | Easy to install and remove. | A threaded and a hose pipe connection for wrench and frequent installation and removal. |
What is a Pipe Coupling?
A pipe coupling is a short fitting with internal female threads on one or both ends, designed to join two pipes or fittings together.
Key Characteristics of Pipe Couplings:
- Internal (female) threads
- Available in full, half, and reducing couplings
- Cylindrical body shape
- Directly extend plumbing length, no change in direction or branch
Types of Pipe Couplings:
- Full Coupling (Standard Coupling)
- Female threads completely cover the internal wall
- Ensures two male threaded pipe fittings tighten overall, no slit
- Most common coupling type
- Half Coupling
- Shorter. Usually, the length of a half coupling is half of a full coupling.
- Shorter. Usually, the length of a half coupling is half of a full coupling.
- Reducing Coupling
- Two different diameters. Larger thread on one end, smaller on the other.
- Transitions between pipe sizes
Comparison Table: Pipe Nipples vs Pipe Couplings
| Feature | Pipe Nipple | Pipe Coupling |
|---|---|---|
| Thread Type | Male on one/both ends | Female Threaded |
| Primary Function | Connect female fittings / extend pipelines | Connect male threaded pipe fittings |
| Length Range | Close to 12″+ | Usually under 6″ |
| Installation | Threads into female threaded fittings | Male threaded pipe fittings thread into it |