Swivel fittings Manufacturers online

Swivel fittings are special connecting elements that enable a rotatable connection between two pipe or component sections without compromising the tightness or mechanical connection.

They are used wherever lines need to remain movable or rotatable components need to be reliably supplied with a medium (gas, liquid, hydraulic oil, etc.) without twisting or tearing off.

Below you will find the functionality, designs and variants as well as typical operating conditions of swivel fittings, their use and their advantages:

How swivel fittings work:

The key feature of a swivel fitting is its ability to create a rotatable connection while maintaining a reliable seal. The mechanical structure typically consists of the following elements:

1. Two main parts:
   A stationary connection body, e.g. threaded or push-in, and a rotatable part, usually with a connection thread or push-in connection for the hose.
2. Bearing or sliding ring:
   These components allow the moving part to rotate freely around the longitudinal axis, usually with minimal frictional resistance.
3. Sealing systems:
   O-rings, mechanical seals or special radial seals ensure that the connection remains media- and pressure-tight even during rotation.

It is important that the rotary movement is not transmitted to the connected pipes or hoses. This prevents tension, kinks or material fatigue - especially with moving machine parts.

Designs and variants of swivel fittings:

Swivel fittings are available in a variety of designs - depending on the intended use, medium and pressure requirement:

1. Designs with internal or external thread.
2. Models with hose nozzle or push-in connection.
3. As angled or straight versions.
4. With high pressure resistance for hydraulic applications.
5. Made of materials such as brass, stainless steel or plastic.

The choice of the right design depends on the medium, the movement requirements, the desired tightness and the ambient conditions.

Typical operating conditions for swivel fittings:

Swivel fittings are often operated under difficult conditions:

1. High pressure: Many models are designed for operating pressures above 100 bar (e.g. in hydraulics).
2. Movement cycles: The sealing systems are designed to withstand many thousands to millions of rotations without failure.
3. Temperature load: Depending on the choice of material, they can withstand temperatures from -40 °C to over 200 °C.
4. Media diversity: They must be compatible with air, water, oils, chemical substances or vapors.

Use of swivel fittings:

Swivel fittings are used in many industries, especially where movement or rotation occurs without the need to twist or pull off a line:

1. Pneumatics and hydraulics:
In robots, handling systems or presses, swivel fittings ensure that hoses do not wind up, twist or become damaged by pulling.

2. Mechanical engineering:
They enable the media-carrying supply of rotating machine parts such as rotary tables, spindles, tool changers or grippers.

3. Vehicle technology:
In cranes, construction machinery or commercial vehicles, they prevent hose damage to moving arms or rotating components.

4. Automation:
Especially for axis movements and rotating manipulators, they ensure flexibility and durability of cable routing.

5. Swivel and swivel joints:
In combination with joints, they offer media-carrying rotation options.

6. Laboratory and medical technology:
Here, they enable movable connections in sensitive or sterile environments - e.g. for devices with rotating containers.

Advantages of swivel fittings:

• Prevent twisting of tubing: Tubing remains stress-free and does not twist with moving parts, which increases service life.
• Protection against leaks and wear: The seals are specially designed for dynamic movements and can withstand many rotation cycles without loss of function.
• Increased flexibility during installation: The connection direction can be adapted more easily, which simplifies installation in complex systems.
• Compact design: Modern swivel fittings are often designed to save space and can also be integrated into tight installation spaces.

Swivel fittings are important components in dynamic systems in which components move or rotate, but at the same time require a secure and tight conduit for media. Their special design protects hoses from twisting, reduces wear and increases the service life of systems. They offer flexibility, safety and efficiency - provided they are correctly dimensioned, matched to the medium and professionally installed.

Here are the most important aspects to look out for when purchasing swivel fittings:

When purchasing swivel fittings, much more is important than just the correct connection diameter. As these components are used in moving systems, they must not only be media and pressure-tight, but also withstand high mechanical loads without losing functionality.

• The material of the swivel fitting must be chemically resistant to the medium that is passed through it. Whether air, water, hydraulic oil, steam, aggressive chemicals or gases - the materials of the housing, seals and bearing components must reliably withstand the medium.
• Brass, stainless steel or galvanized steel with oil-resistant seals, e.g. NBR, FKM, are required for hydraulic systems.
• Stainless steel or PTFE-coated versions are recommended for chemical media.
• For food or medical technology, all materials must be food-safe, silicone-free or approved in accordance with FDA/EC 1935/2004.
• Swivel fittings must reliably withstand the operating pressure prevailing in the system - even with continuous movement. The manufacturer's specifications for the permissible working pressure are binding and should be selected with safety margins, especially in the event of possible pressure peaks.
• At the same time, temperature resistance must also be taken into account. Heat or cold have a direct effect on the elasticity and service life of the seals as well as on the mechanical fit.
• Especially in hydraulic systems or in hot process areas, e.g. with steam or oil, temperature-resistant materials and seals are required.
• The swivel fitting must be designed for the actual movement requirements of the application:
• Will it be moved frequently and continuously, e.g. in robots or rotating arms?
• Are there continuous or only occasional rotations?
• Does only one connection rotate or the entire body?
• Not every swivel fitting is suitable for continuous rotation. Special ball bearing or plain bearing solutions are required for high numbers of cycles or continuous rotation. The frictional resistance should be low to avoid unnecessary forces.
• The connection side of the swivel fitting must match the existing lines, hoses or fittings exactly. Frequently used connection types are
• Metric, BSP, NPT, UNF threaded connections.
• Push-in fittings for pneumatic hoses.
• Hose nozzles.
• Cutting ring fittings or compression fittings.
• Attention should also be paid to whether the connection remains rotatable or is screwed rigidly during installation. An incorrect connection angle can lead to problems, especially in tight installation spaces.
• At the heart of every swivel fitting is the sealing system, which must ensure a reliable seal despite movement. Depending on the requirements, the following are used
• O-rings for moderate pressures and temperatures.
• Mechanical seals for rotating shafts.
• High-pressure sealing systems for hydraulics.
• Radial seals for dynamic loads.
• The choice of sealing system depends on the medium, the rotational speed, the pressure and the temperature. Poor or unsuitable seals quickly lead to leaks, especially when in motion.
• Rotary unions often have to be integrated into compact machines or moving assemblies. The design is therefore crucial:
• Straight or angled design.
• Axially or radially rotatable.
• Flange mounting or screw-in mounting.
• The geometry must be coordinated with the direction of movement and the hose routing. An incorrectly selected design can not only put unnecessary strain on the hose, but also restrict the mobility of the entire system.
• Swivel fittings are subject to mechanical wear due to vibrations, torsion, loads caused by rotation or external influences. The material quality must therefore be right:
• Stainless steel is ideal for high corrosion loads or aggressive media.
• Brass is sufficient and cost-effective in many pneumatic and hydraulic applications.
• High-performance plastics are useful for weight reduction or chemical loads.
• Mechanical robustness is particularly important in mobile or heavy machinery where external forces or vibrations act on the screw connection.
• A professional selection should also have long-term operation in mind. This includes
• How many rotation cycles does the manufacturer guarantee?
• Can seals be replaced or maintained?
• Is there experience or data on long-term stability?
• Turnbuckles with a long service life significantly reduce service calls, downtimes and maintenance costs.
• Certified components are mandatory in many industries. When purchasing, you should pay attention to applicable standards and approvals, such as
• ISO or DIN standards for hydraulics/pneumatics
• ATEX approval for potentially explosive atmospheres
• FDA/EC 1935/2004 for food contact
• REACH/RoHS conformity for material guidelines
• These standards provide safety and are often a prerequisite for use in regulated industries or for end customer requirements.
• The availability of spare and expansion parts is also important for professional operation. Questions that are important here:
• Is the selected fitting part of a modular system?
• Are there suitable connectors, adapters or distributors from the same manufacturer?
• What is the availability in an emergency or when reordering?
• A consistent system from one manufacturer often offers better compatibility, lower training requirements and lower storage costs.

Purchasing swivel fittings requires technical understanding and forward planning. The right choice is based not only on size and price, but also on a detailed analysis of the medium, pressure, temperature, movement, installation situation, material compatibility and safety requirements. Choosing high-quality, suitable components ensures greater operational reliability, reduced downtimes and a longer service life for the entire system.

Swivel fittings can be purchased from various suppliers. You will find comprehensive information on manufacturers and suppliers of Swivel couplings around the world on Exportpages.