SKU 2ff9d989c2a1 Category

Round wire snap ring

Product Description


Constant section retaining snap rings feature a uniform, constant section. This means that the material used to make the ring has the same width at any point along the circumference of the ring. This costs less than tapered and spiral-retaining snap-rings and provides only three-point contact with the groove.

Round wire snap-rings are split rings formed and cut from circular spring wire. Round wire snap rings are designed for use with round grooves in outer and inner shaft or bore applications. Round wire snap-rings tend to hold tighter tolerances; however, their load-carrying capacity is lower than their square and rectangular counterparts.

Round wire snap rings: axial mounting snap-rings for shafts with semi-circular grooves. Fitting more tightly in their grooves than traditional snap-rings, they provide a higher and more uniform thrust load capacity. Manufactured from hardened circular section carbon spring wire.

Advantages of constant section retaining snap rings

  1. No assembly or disassembly lugs = space-saving in the radial direction;
  2. Edges with radius, no stamping burrs;
  3. Square-edge wire for sharp-edged installations;
  4. No special tooling for exotic materials;
  5. No special tooling for installation or removal is necessary.
  6. Conform to DIN 471/472;
  7. Higher ring shear;
  8. Special ends for specific applications;
  9. Heavy-duty sections for higher rotational capacities

Round wire snap ring

A constant cross-section retaining ring is oval when installed in a groove and only makes three points of contact. Therefore, they withstand less force than tapered section rings, making them an economical alternative to such rings, depending on the application. They also provide more clearance than tapered rings but are more difficult to install or remove. Automotive transmissions are a typical application for constant-section rings.


Metric thrust rings are designed for axial mounting in machined grooves. These snap rings can be internal, for fitting in housings and bores, or external, for fitting on shafts. Once mounted, they provide a protrusion or “shoulder” that holds the part in place.

Industrial-grade snap rings, often referred to as constant-section snap-rings, are wire-retaining rings made of carbon spring steel with a wide rectangular cross-section providing a prominent shoulder for the retainer. Constant section rings are available as inner and outer rings for grooved applications off shafts or in bores and housings. Both inner and outer rings are available in a range of gap sizes and point types to suit most applications.

  1. Made of carbon spring steel with untreated or phosphate surfaces.
  2. Specifically designed for applications with low thrust loads,
  3. Easy to install or remove with snap-ring pliers.


In the world of mechanical engineering, precision and reliability are paramount. Snap rings, also known as retaining rings or circlips, play an essential role in maintaining the integrity and functionality of various mechanical assemblies. These seemingly small, unassuming components are actually engineering marvels that have a significant impact on the performance and safety of machinery and equipment. This comprehensive product description explores snap rings in detail, from their various types and applications to their manufacturing processes and the critical role they play in ensuring the stability and functionality of mechanical systems.

Chapter 1: What Are Snap Rings?

1.1 Snap-Rings Defined

Snap rings are circular or semi-circular fasteners, typically made from metal, designed to fit into a groove or channel on a shaft or in a bore to create a retaining shoulder. They are used to secure components like bearings, gears, or pulleys in place, prevent axial movement, and ensure the overall stability of mechanical assemblies.

1.2 Terminology and Nomenclature

Snap-rings go by different names, including retaining rings, circlips, or C-rings. These terms are often used interchangeably, but they all refer to the same basic concept of a retaining fastener.

Chapter 2: Types of Snap Rings

2.1 Internal Snap-Rings

Internal snap-rings are designed to fit into a groove or channel within a bore, providing retention on the inside of the assembly. They are commonly used in applications where space constraints prevent the use of external snap-rings.

2.2 External Snap-Rings

External snap-rings, on the other hand, are designed to fit into a groove or channel on the outside of a shaft, providing retention from the exterior of the assembly. They are typically used when the components being retained are located on the outside of the bore.

2.3 Traditional Snap Rings

Traditional snap-rings are typically flat or straight-edged, offering a consistent level of retention. They are widely used in various industries, ranging from automotive to industrial machinery.

2.4 Beveled Snap-Rings

Beveled snap rings have a slight bevel or taper on one side. This design allows for more precise retention and is often used in applications where the retaining force needs to be distributed evenly.

2.5 E-Clips

E-clips, also known as wave or bowed E-rings, have a wave-like shape that offers a greater degree of flexibility and retention in certain applications. They can adapt to minor variations in groove dimensions.

Chapter 3: Snap Ring Materials

3.1 Carbon Steel

Carbon steel snap-rings are cost-effective and provide good corrosion resistance. They are commonly used in various industrial applications, especially when frequent maintenance is possible.

3.2 Stainless Steel

Stainless steel snap rings offer excellent corrosion resistance, making them ideal for applications in harsh environments, such as marine, chemical, or food processing industries.

3.3 Beryllium Copper

Beryllium copper snap-rings provide exceptional strength, electrical conductivity, and resistance to corrosion. They are often used in electrical and high-temperature applications.

3.4 Phosphor Bronze

Phosphor bronze snap-rings are known for their high resistance to wear and tear. They are typically used in applications where frequent assembly and disassembly are required.

Chapter 4: Snap Ring Sizes and Standards

4.1 Standardization

Snap-rings are manufactured according to various national and international standards to ensure compatibility and interchangeability across different applications. Common standards include DIN 471 and DIN 472, ASME B18.27, and JIS B 2804.

4.2 Sizing Conventions

Snap-ring sizes are typically specified in terms of their shaft diameter and groove dimensions, ensuring a precise fit for each application. Understanding these sizing conventions is crucial when selecting the appropriate snap ring for a specific task.

Wire forming snap ring

Chapter 5: Applications of Snap Rings

5.1 Automotive Industry

Snap rings are widely used in the automotive industry for various applications, such as securing wheel bearings, transmission components, and axle assemblies.

5.2 Aerospace Industry

In the aerospace sector, where precision and reliability are paramount, snap-rings are used to secure critical components like bearings, fasteners, and actuation systems.

5.3 Manufacturing and Machinery

Snap rings play a vital role in the manufacturing and machinery industries, securing components in heavy machinery, conveyor systems, and hydraulic cylinders.

5.4 Consumer Electronics

Even in the world of consumer electronics, snap-rings are utilized in products like smartphones and cameras to secure lenses, buttons, and other critical components.

5.5 Medical Devices

In the medical field, where precision and safety are critical, snap rings are used in medical devices such as surgical instruments, ensuring their proper functioning and longevity.

Chapter 6: Manufacturing Process

6.1 Material Selection

The manufacturing process of snap rings begins with the selection of the appropriate material, taking into consideration factors like corrosion resistance, strength, and cost.

6.2 Stamping

Stamping is the most common method of producing snap-rings. It involves cutting and forming the rings from a sheet of metal using a stamping press.

6.3 Heat Treatment

After stamping, the snap rings are subjected to heat treatment processes to improve their hardness and resilience.

6.4 Surface Finish

Snap-rings often undergo a surface finishing process, such as passivation or coating, to enhance their corrosion resistance and appearance.

6.5 Inspection and Quality Control

Each snap-ring undergoes rigorous inspection and quality control procedures to ensure it meets the specified standards and tolerances.

Chapter 7: Installation and Removal

7.1 Installation Tools

Installing snap rings typically requires specialized tools, such as snap-ring pliers or applicators. These tools ensure proper placement and retention of the rings.

7.2 Removal Techniques

Removing snap-rings can be done using snap-ring pliers, but in some cases, specially designed hooks or picks are also used to safely extract the rings.

Chapter 8: Proper Handling and Safety

8.1 Safety Precautions

Handling snap rings, especially during installation and removal, requires caution. Safety precautions must be taken to prevent injury and damage to the rings.

8.2 Lubrication

Applying the appropriate lubrication during installation can reduce friction and make it easier to secure or remove snap rings, extending their lifespan.

Chapter 9: Troubleshooting and Maintenance

9.1 Troubleshooting Common Issues

Understanding and diagnosing common snap-ring issues, such as misalignment or improper retention, is essential for ensuring the reliability of mechanical assemblies.

9.2 Maintenance Practices

Regular maintenance and inspection of snap-rings are critical to identifying wear and tear, corrosion, or damage that may affect their performance.

Chapter 10: Advancements in Snap Ring Technology

10.1 Advanced Materials

Advancements in materials science have led to the development of snap-rings with superior strength, corrosion resistance, and wear characteristics.

10.2 Coating Technologies

Innovative coating technologies provide snap rings with enhanced protection against corrosion and friction, extending their lifespan and improving performance.

10.3 3D Printing

The emergence of 3D printing technology has the potential to revolutionize the manufacturing of snap rings, offering customization and rapid prototyping capabilities.

In conclusion, snap-rings may be small in size, but their significance in the world of mechanical engineering cannot be overstated. These unassuming components provide essential retention and stability in countless applications, from automotive to aerospace, manufacturing, and beyond. Understanding the types, materials, sizing conventions, applications, manufacturing processes, and safety considerations associated with snap-rings is crucial for anyone involved in mechanical design and maintenance.

Snap-rings are a testament to the precision and innovation that underpin mechanical engineering, and as technology continues to advance, they will undoubtedly play a key role in the development of even more reliable and efficient mechanical systems. In this ever-evolving landscape, these unassuming components will continue to uphold the integrity and performance of the machinery and equipment that drive our modern world.

2 Turn External spiral snap ring

What is the difference between internal and external snap rings, and when should each type be used in a mechanical assembly?

Internal Snap-Rings:
  • Location: Internal snap-rings are designed to fit inside a bore or housing. They are installed within a snap ring groove machined on the inside of the bore or housing.
  • Function: Internal snap-rings prevent components from moving outward along the shaft by creating a shoulder or retaining lip inside the bore.
  • Use Cases: Internal snap-rings are commonly used when you need to secure components within a housing or bore, preventing them from moving outward. They are often used in applications such as hydraulic cylinders, bearing housings, and certain types of machinery assemblies.
  • Advantages: They are generally hidden from view and offer a clean, unobtrusive appearance in an assembly.

External Snap Rings:

  • Location: External snap-rings are designed to fit around the outside of a shaft. They are installed within a snap-ring groove machined on the outside of the shaft.
  • Function: External snap-rings prevent components from moving axially away from the shaft by creating a shoulder or retaining lip on the outside.
  • Use Cases: External snap-rings are commonly used when you need to secure components on a shaft, preventing them from sliding off. They find applications in automotive axles, gearboxes, and various machinery and equipment assemblies.
  • Advantages: They are easier to install and remove compared to internal snap rings, particularly when accessibility is limited.

When to Use Each Type:

The choice between internal and external snap-rings depends on the specific requirements and design of your mechanical assembly:

  • Space Constraints: If there is limited space within a bore, an internal snap-ring is usually more practical, as it doesn’t add to the shaft’s diameter. Conversely, if space is not a concern, external snap-rings can be used.
  • Load Direction: Consider the direction in which the load or force will be applied. If the component needs to resist axial forces pushing it away from the shaft, an external snap-ring is appropriate. If the force is coming from inside the bore and pushing components outward, an internal snap ring should be used.
  • Accessibility: External snap-rings are generally easier to install and remove, especially in applications with limited access.
  • Environmental Factors: Consider the environment in which the snap-rings will be used. External snap-rings may be more suitable in environments with exposure to dust, moisture, or corrosive elements, as they can be easily inspected and replaced if needed.

Ultimately, the choice between internal and external snap rings should be made based on the specific needs and constraints of your mechanical assembly, ensuring that the selected type effectively secures the components in place while considering factors like space, load direction, accessibility, and environmental conditions.



Q: What is a snap ring?

A snap-ring, also known as a retaining ring or circlip, is a type of fastener used to secure components on a shaft or inside a bore by snapping into a groove or recess.

Q: What are the common types of snap-rings?

There are two primary types of snap-rings: internal and external. Internal snap-rings fit inside a bore or housing, while external snap-rings fit around a shaft. These can further be categorized into various styles, such as E-rings, C-rings, and more.

Q: What materials are snap-rings typically made from?

Snap-rings are commonly made from materials like spring steel, carbon steel, stainless steel, and occasionally plastic. The material choice depends on factors like corrosion resistance, load-bearing capacity, and environmental conditions.

Q: How are snap rings installed and removed?

Snap-rings are typically installed and removed using specialized tools like snap-ring pliers. To install a snap-ring, it’s compressed to fit into the groove, and when released, it expands to secure the components. To remove a snap-ring, it’s compressed using pliers or a similar tool to facilitate extraction.

Q: What are some common applications for snap rings?

Snap-rings are used in various applications where components need to be secured on a shaft or inside a bore. Common applications include automotive transmissions, gearboxes, industrial machinery, appliances, and many other mechanical and engineering systems.

Q: What is the purpose of the grooves or recesses in which snap rings are installed?

The grooves or recesses, known as snap-ring grooves, are machined features in the shaft or bore where the snap-ring is installed. They provide a secure location for the snap-ring to snap into, preventing the axial movement of the components being retained.

Q: Can snap rings be reused?

Snap-rings can often be reused, provided they are not damaged during removal. However, it’s essential to inspect them for signs of wear, deformation, or other issues that may compromise their effectiveness. When in doubt, it’s generally recommended to replace them with new ones for safety and reliability.

Q: Are there different sizing standards for snap rings?

Yes, various international standards and sizing conventions exist for snap-rings, including DIN (German), ANSI (American), and JIS (Japanese). These standards define the dimensions and specifications of snap-rings to ensure compatibility with different applications and components.

Q: Can snap rings fail, and what are the consequences of failure?

Snap-rings can fail if they are damaged, worn, or not installed correctly. The consequences of failure can include components coming loose, leading to machinery malfunction, damage, or even safety hazards. Regular inspection and maintenance are essential to prevent such failures.

Q: Are there alternatives to snap-rings for securing components on shafts or in bores?

Yes, there are alternative methods for securing components, including set screws, pins, keyways, and threads. The choice of method depends on the specific application and the requirements for security, ease of assembly, and maintenance.