Different Types of Pipe Nipples Explained

Pipe nipples are essential components used in many piping systems to connect pipes, fittings, valves, and equipment.

Although pipe nipples may look similar, different designs provide different installation advantages and performance characteristics.

The most common types of pipe nipples include:

• Close nipple
• Barrel nipple
• Hex nipple
• Weld nipple

Each type has unique features depending on installation space, connection requirements, and application environment.

Choosing the correct pipe nipple type can improve system reliability, prevent leakage, and simplify installation.

What Are the Main Types of Pipe Nipples?

Pipe nipples are mainly classified according to their structure and connection method.

The four most common types are:

Type	Main Feature	Common Applications
Close Nipple	Threads almost the entire length	Compact piping connections
Barrel Nipple	Threaded ends with center pipe section	General industrial piping
Hex Nipple	Hexagonal center section	Easy wrench installation
Weld Nipple	Designed for welding connection	High-pressure systems

1. Close Nipple

What Is a Close Nipple?

A close nipple is a short pipe nipple with threads extending almost across the entire length of the pipe.

Because there is almost no unthreaded section between the two threaded ends, close nipples provide the shortest possible connection distance.

They are commonly used where installation space is limited.

Features of Close Nipples

Compact Design

The main advantage of a close nipple is its extremely short length.

It allows two fittings to be connected closely together without requiring additional space.

Full Thread Engagement

Close nipples provide maximum thread contact between connected components.

This helps create a secure mechanical connection when installed correctly.

Easy Installation

Close nipples are commonly used with:

• Pipe fittings
• Elbows
• Couplings
• Valves

Common Applications of Close Nipples

Close nipples are widely used in:

• Plumbing systems
• Water supply systems
• Hydraulic equipment
• Industrial piping

They are especially suitable for applications where space is restricted.

2. Barrel Nipple

What Is a Barrel Nipple?

A barrel nipple is one of the most commonly used pipe nipple types.

Unlike a close nipple, a barrel nipple has threaded ends with an unthreaded pipe section in the middle.

The center section provides additional length and flexibility during installation.

Features of Barrel Nipples

Available in Different Lengths

Barrel nipples can be manufactured in many lengths according to customer requirements.

Common lengths include:

• Short barrel nipples
• Medium length nipples
• Long barrel nipples

Better Installation Flexibility

The center pipe section allows easier alignment between connected components.

This makes barrel nipples suitable for general piping applications.

Common Applications of Barrel Nipples

Barrel nipples are often used in:

• Industrial piping
• Building plumbing
• Water systems
• Mechanical equipment connections

3. Hex Nipple

What Is a Hex Nipple?

A hex nipple is a pipe nipple with a hexagonal section in the center.

The hex shape allows installers to use a wrench during installation.

This makes hex nipples especially useful where tightening accuracy and easy maintenance are important.

Advantages of Hex Nipples

Easy Tightening

The hexagonal center provides a secure gripping surface for tools.

This helps prevent:

• Slipping during installation
• Thread damage
• Improper tightening

Convenient Maintenance

Hex nipples can be easier to remove compared with standard round nipples.

They are suitable for systems requiring periodic inspection or replacement.

Applications of Hex Nipples

Common applications include:

• Hydraulic systems
• Pneumatic equipment
• Industrial machinery
• Instrument connections

4. Weld Nipple

What Is a Weld Nipple?

A weld nipple is designed for welded connections instead of threaded connections.

It provides a permanent connection between piping components.

Advantages of Weld Nipples

Strong Connection

Welded connections provide excellent strength and sealing performance.

Suitable for High-Pressure Systems

Weld nipples are commonly used in demanding environments where threaded connections may not be suitable.

Applications of Weld Nipples

Typical industries include:

• Oil and gas
• Chemical processing
• Power generation
• Heavy industrial systems

Close Nipple vs Barrel Nipple

Close nipples and barrel nipples are two of the most common pipe nipple types.

Feature	Close Nipple	Barrel Nipple
Length	Very short	Available in many lengths
Thread	Almost full length	Threaded ends only
Installation Space	Limited space	General applications
Flexibility	Lower	Higher

Choose Close Nipple When:

• Space is limited
• Components need to be installed closely together
• Short connection distance is required

Choose Barrel Nipple When:

• More installation flexibility is needed
• Alignment adjustment is important
• Standard piping connections are required

How to Choose the Right Pipe Nipple Type?

Selecting the correct pipe nipple depends on several factors.

1. Installation Space

For tight spaces:

Choose:

• Close nipple
• Short barrel nipple

2. Connection Method

Consider:

• Threaded connection
• Welded connection

Threaded systems usually use:

• Close nipple
• Barrel nipple
• Hex nipple

Welded systems may require:

• Weld nipple

3. Application Requirements

Different industries require different solutions.

For example:

Application	Recommended Type
Plumbing	Close / Barrel Nipple
Industrial piping	Barrel Nipple
Equipment connection	Hex Nipple
High-pressure systems	Weld Nipple

Pipe Nipple Materials Available

Different pipe nipple types can be manufactured using various materials.

Stainless Steel Pipe Nipples

Advantages:

• Excellent corrosion resistance
• Suitable for harsh environments
• Long service life

Common grades:

• Stainless Steel 304
• Stainless Steel 316

Carbon Steel Pipe Nipples

Advantages:

• High strength
• Cost-effective
• Suitable for industrial applications

Galvanized Steel Pipe Nipples

Advantages:

• Improved corrosion protection
• Suitable for water applications

Pipe Nipple Thread Options

Depending on market requirements, pipe nipples can be supplied with different thread standards.

Common options include:

NPT Thread

Used widely in North America.

BSP Thread

Common in Europe, Asia, and international markets.

Frequently Asked Questions

What are the different types of pipe nipples?

The most common types are close nipples, barrel nipples, hex nipples, and weld nipples.

Which pipe nipple type is the shortest?

A close nipple is usually the shortest pipe nipple because the threads extend almost the entire length.

What is a hex nipple used for?

A hex nipple is used where wrench installation and easy maintenance are required.

Are pipe nipples available in custom sizes?

Yes. Professional manufacturers can produce pipe nipples according to custom lengths, materials, thread types, and customer specifications.

Conclusion

Understanding different types of pipe nipples helps engineers, contractors, and buyers select the right connection solution for their piping systems.

Close nipples provide compact connections, barrel nipples offer flexibility, hex nipples simplify installation, and weld nipples provide strong permanent connections.

By selecting the correct pipe nipple type, material, and thread standard, you can improve piping system performance and reliability.

For customized pipe nipples, including different sizes, materials, and thread options, contact a professional pipe nipple manufacturer for technical support.