Shaft Retaining Ring Selection: DIN 471, ASME B18.27, E-Rings & Snap Rings

A shaft retaining ring has a simple job:

Prevent a component from moving beyond its intended axial position on a shaft.

Selecting the correct retaining ring, however, is not always simple.

A designer may choose between:

• DIN 471 external retaining rings;

• ASME B18.27 external retaining rings;

• E-rings;

• retaining washers;

• round-wire snap rings;

• rectangular-profile snap rings;

• heavy-duty retaining rings;

• drawing-specific retaining components.

These products may all perform an axial-retention function, but they do not necessarily use the same groove, installation method, load path or dimensional system.

For engineers, the correct question is therefore not:

“What circlip fits this shaft?”

It is:

“Which shaft-retention architecture matches the axial load, groove, assembly method and operating conditions?”

For procurement teams, the corresponding question is:

“What standard, ring type, groove, material and finish does the drawing actually require?”

JUXIN FASTENERS supports standard and drawing-based shaft retaining rings for industrial machinery, 

automotive and EV equipment, electric motors, pumps, gearboxes, automation systems, HVAC equipment, power systems and other OEM mechanical assemblies.

What Is a Shaft Retaining Ring?

A shaft retaining ring is a mechanical component used to restrict axial movement of another component mounted on a shaft.

Depending on the design, it may also be called:

• external retaining ring;

• external circlip;

• shaft circlip;

• external snap ring;

• retaining washer;

• E-ring.

These terms overlap in commercial usage, but they do not always identify the same geometry.

The basic function is:

Retained Component → Retaining Ring → Shaft Groove → Shaft

The groove is therefore part of the retaining system.

What Does a Shaft Retaining Ring Actually Do?

Its primary function is:

Axial Retention

Typical retained components include:

• bearings;

• gears;

• spacers;

• sleeves;

• pulleys;

• sprockets;

• rollers;

• mechanical subassemblies.

The retaining ring creates a mechanical stop against axial movement.

Shaft Retaining Ring ≠ Torque-Transfer Device

The old assumption that a retaining ring transfers shaft torque is generally misleading.

Torque between a shaft and rotating component is normally transmitted through an appropriate feature such as:

• key;

• spline;

• interference fit;

• clamping hub;

• another engineered drive interface.

The retaining ring primarily controls axial movement.

Therefore:

Axial Retention ≠ Torque Transmission

A gear may be axially retained by a circlip while its torque is transmitted by a spline or key.

These are separate functions.

Shaft Retaining Ring ≠ Radial Bearing

A retaining ring should not automatically be specified to carry the primary radial load of a rotating component.

Radial loads should normally be supported by the intended:

• bearing;

• shaft;

• housing;

• structural interface.

Therefore:

Retaining Ring ≠ Radial Bearing

Shaft Retaining Ring ≠ Vibration Damper

Spring characteristics allow retaining rings to deform during installation and recover into their grooves.

That does not mean they should automatically be described as vibration absorbers.

Therefore:

Elastic Installation Behavior ≠ Vibration Damping

If the assembly requires vibration isolation, damping or rotational anti-loosening, those functions should be addressed separately.

The First Selection Question: Shaft or Bore?

Before choosing a standard, identify where the retaining ring is installed.

Shaft

The ring is installed on the outside of a shaft.

Examples include:

• DIN 471 external retaining rings;

• ASME B18.27 external types;

• E-rings;

• DIN 6799 retaining washers;

• shaft snap rings.

Bore

The ring is installed inside a housing or bore.

Examples include:

• DIN 472 internal retaining rings;

• ASME internal retaining rings.

This article focuses on shaft-retention systems.

For internal bore applications, refer to the JUXIN FASTENERS DIN 472 Internal Retaining Rings: Bore Groove, Axial Load & Selection Guide.

The Second Question: Metric or Inch?

The dimensional system is an important early decision.

Metric Shaft Systems

DIN 471 is a major standard for metric shaft retaining rings.

Inch Shaft Systems

ASME B18.27 covers tapered and reduced-cross-section retaining rings in inch-series dimensions.

Do not convert an inch shaft diameter into an approximate metric dimension and assume a DIN ring will fit correctly.

Likewise, a metric shaft should not automatically receive an inch-series retaining ring because the nominal diameters appear close.

The groove geometry matters.

DIN 471 External Retaining Rings

DIN 471 covers retaining rings for shafts in:

• normal type;

• heavy type.

The current edition is:

DIN 471:2026-05

DIN identifies these rings as components used to secure parts such as rolling bearings on shafts and to transmit axial forces.

DIN 471 is therefore a strong starting point when the design uses:

• metric shafts;

• external shaft grooves;

• conventional circlip installation;

• DIN-controlled drawings.

DIN 471 Normal Type vs Heavy Type

DIN 471 includes both normal and heavy configurations.

Do not assume:

Heavy Type = Better for Every Joint

The correct type depends on:

• drawing requirement;

• axial force;

• shaft geometry;

• groove;

• installation space;

• complete assembly.

Changing ring type may also require changing the groove.

ASME B18.27 Inch-Series Retaining Rings

For U.S. inch-series equipment, ASME B18.27 is an important standard family.

The current listed standard is:

ASME B18.27-1998 (S2022)

It covers multiple tapered and reduced-cross-section retaining-ring types rather than one universal external ring.

These include conventional external, internal, E-ring, heavy-duty and other specialized geometries.

ASME B18.27 External Type NA1

External Type NA1 is one of the conventional shaft-retaining configurations covered by ASME B18.27.

It is particularly relevant to:

• U.S. industrial equipment;

• inch shafts;

• North American OEM drawings;

• legacy machinery;

• MRO replacement.

For detailed inch-series selection, refer to the JUXIN FASTENERS ASME B18.27 External Retaining Rings: Inch Shaft & NA1 Selection Guide.

DIN 471 vs ASME B18.27

Both standards include external shaft-retention solutions, but they should not be treated as interchangeable systems.

What Is an E-Ring?

An E-ring is a retaining component with an E-shaped profile designed for radial installation onto a shaft groove.

Unlike many conventional external circlips, an E-ring does not need to be expanded over the shaft end using conventional circlip pliers.

This can be important in assembly design.

Axial Installation vs Radial Installation

Installation direction is one of the most overlooked retaining-ring selection criteria.

Conventional External Circlip

Often installed axially over the end of the shaft before seating in the groove.

E-Ring

Installed radially into the groove from the side.

This creates a useful decision rule:

Shaft End Accessible → Conventional External Ring May Be Practical

Shaft End Not Accessible → Radial-Install Retaining Architecture May Be Worth Evaluating

The actual design and standard must still be checked.

Why E-Rings Can Improve Assembly Access

Consider an assembly where the shaft end is blocked by another component.

An axial-install external ring may be difficult or impossible to install.

A radial-install ring can sometimes simplify the assembly sequence.

This means retaining-ring selection is not only about load.

It is also about:

Assembly Architecture

ASME B18.27 E-Rings

ASME B18.27 includes:

E-Ring Type NA3

and other E-ring-related configurations.

These should not automatically be substituted for NA1 external rings.

The groove and installation architecture must match the selected ring.

DIN 6799 Retaining Washers for Shafts

Another shaft-retention family is covered by:

DIN 6799

The current DIN catalogue lists:

DIN 6799:2026-05 — Retaining Washers for Shafts

This is a separate product family from DIN 471.

Therefore:

DIN 471 Retaining Ring ≠ DIN 6799 Retaining Washer

They may solve related axial-retention problems but use different geometries.

Retaining Washer vs External Circlip

A retaining washer may provide advantages for particular:

• shaft geometry;

• groove geometry;

• assembly direction;

• space constraints.

The correct component should be selected from the drawing or actual design requirement.

Do not substitute solely because both products retain components on shafts.

Round-Wire Snap Rings

DIN also maintains standards for round-wire snap rings.

For shaft applications, this includes:

DIN 9925 — Round Wire Snap Rings for Shafts

Round-wire rings differ from conventional stamped retaining rings in:

• cross section;

• groove interaction;

• installation behavior.

Therefore:

Round-Wire Snap Ring ≠ DIN 471 Circlip

Rectangular-Profile Snap Rings

Another retaining architecture uses a rectangular profile.

DIN lists:

DIN 9927 — Snap Rings with Rectangular Profile for Shafts

Again, this is a distinct product family.

The cross-section geometry changes how the ring interfaces with the groove and retained component.

Why So Many Shaft Retaining Ring Types Exist

There is no single ideal retaining ring for every shaft.

Different designs solve different combinations of:

• axial load;

• shaft diameter;

• available radial space;

• available axial space;

• assembly access;

• groove geometry;

• serviceability;

• rotational speed;

• production method.

This is why selecting by shaft diameter alone is insufficient.

The Groove Is Part of the Retention System

Regardless of retaining-ring type:

Ring + Groove + Shaft = Retention System

The groove determines:

• ring engagement;

• axial location;

• remaining shaft section;

• load transfer;

• installation behavior.

A high-quality retaining ring installed into an incorrect groove may not perform correctly.

Groove Diameter

Groove diameter influences:

• engagement;

• ring position;

• remaining shaft cross-section.

A deeper groove is not automatically better.

The applicable standard or validated drawing should control the dimension.

Groove Width

Groove width affects:

• axial fit;

• seating;

• clearance;

• load transfer.

Incorrect width can produce either excessive movement or assembly interference.

Groove Location

The groove's axial position determines where the retained component stops.

This can influence:

• bearing location;

• gear alignment;

• end play;

• spacer stack;

• assembly tolerance.

Groove Edge Strength

Axial force is transferred from the component through the retaining ring into the groove.

The groove edge must therefore withstand the resulting load.

Potential failure modes can include:

• groove deformation;

• local yielding;

• shearing;

• ring pull-out.

Shaft Material Matters

A strong retaining ring cannot compensate for a weak or unsuitable shaft groove.

The complete system should consider:

• shaft material;

• shaft hardness;

• groove geometry;

• axial force;

• ring geometry.

Therefore:

Higher Ring Strength ≠ Automatically Higher Assembly Capacity

How Much Axial Load Must Be Retained?

This is one of the most important engineering questions.

Possible axial-force sources include:

• bearing thrust;

• gear reaction;

• spring force;

• actuator force;

• hydraulic or pneumatic force;

• assembly preload;

• transient impact.

The retaining system should be evaluated against the actual load case.

Pressure Can Become Axial Force

In hydraulic and pneumatic equipment, pressure acting on an effective area can generate axial force.

Conceptually:

Axial Force = Pressure × Effective Area

The retaining ring does not have a universal pressure rating independent of the assembly.

Pressure must first be converted into the mechanical load acting on the retained component.

Static Load vs Cyclic Load

A constant axial load differs from repeated loading.

Applications involving:

• reciprocating equipment;

• repeated thrust;

• load reversal;

• impact;

• shock

may require additional engineering evaluation.

Rotational Speed

Some shaft retaining rings rotate with the shaft.

At elevated rotational speed, the design may need to consider:

• centrifugal effects;

• ring geometry;

• balance;

• ring mass;

• shaft diameter;

• surrounding components.

A ring that fits dimensionally is not automatically suitable for unlimited RPM.

Ring Geometry and Balance

Conventional lugged external retaining rings are not perfectly rotationally symmetric.

For many ordinary applications this is not the controlling factor.

For high-speed precision equipment, however, ring geometry and rotating balance may become more important.

Alternative retaining architectures may be considered where appropriate.

Bearing Retention

Bearings are among the most common components retained by shaft rings.

A typical arrangement is:

Shaft Shoulder → Bearing Inner Ring → External Retaining Ring

The shoulder controls one direction.

The retaining ring controls the other.

Bearing Retention ≠ Bearing Preload

A retaining ring can locate a bearing without applying a controlled preload.

If the bearing system requires preload, additional design elements may be required.

Possible components include:

• wave spring washers;

• disc springs;

• precision spacers;

• shoulders.

Therefore:

Bearing Location ≠ Bearing Preload

Gear Retention

A shaft retaining ring may prevent a gear from moving axially.

But the ring should not automatically be expected to transmit the drive torque.

A typical architecture may be:

Spline / Key → Torque Transfer

Retaining Ring → Axial Retention

Separating these functions improves design clarity.

Pulley and Sprocket Retention

The same principle applies to:

• pulleys;

• sprockets;

• sheaves.

The retaining ring controls axial movement.

The drive interface should transmit torque.

Spacer and Sleeve Retention

Retaining rings can also locate:

• spacers;

• sleeves;

• collars;

• rollers.

The axial-load requirement may be relatively low or substantial depending on the mechanism.

The component name alone does not determine the required ring.

Installation Method Matters

A retaining ring can fail before entering service if installed incorrectly.

Selection should therefore include:

How will this ring be installed?

Possible methods include:

• circlip pliers;

• radial insertion;

• guide tools;

• dedicated production tooling;

• automated installation equipment.

Conventional External Circlip Installation

A conventional external circlip is generally expanded so it can pass over the shaft.

Once aligned with the groove, it is released.

The ring then contracts into the groove.

Do Not Over-Expand the Ring

The ring only needs enough expansion to clear the shaft.

Excessive expansion can cause:

• permanent set;

• distortion;

• reduced spring recovery;

• lug damage;

• installation-hole damage.

Therefore:

More Installation Expansion ≠ Easier or Better Installation

Verify Full Seating

After installation, verify that the ring is fully seated.

Potential causes of incomplete seating include:

• burrs;

• contamination;

• incorrect groove;

• incorrect ring;

• permanent deformation;

• poor tooling.

Do Not Invent a Universal Orientation Rule

Stamped retaining rings can have edge characteristics resulting from manufacturing.

Whether orientation matters depends on:

• ring type;

• manufacturing process;

• load direction;

• drawing;

• supplier specification.

There is no single orientation instruction that should be applied blindly to every retaining ring.

Lubrication Is Not Automatically Required

The old practice of instructing users to apply lubricant before every installation is too broad.

Lubrication can affect:

• handling;

• contamination;

• assembly process;

• corrosion protection;

• adjacent components.

Follow the applicable equipment and assembly specification.

Do not introduce lubricant into a controlled assembly unless permitted.

A Torque Wrench Does Not Tighten a Retaining Ring

Another common procedural mistake is combining retaining-ring installation with bolt-torque instructions.

A conventional retaining ring is not tightened by torque.

It is seated mechanically in its groove.

If the assembly also contains:

• bolts;

• shaft nuts;

• clamping screws,

those components may have torque requirements.

But those requirements are separate from retaining-ring installation.

The Ring Does Not Need to Sit “Near the Bearing” by Default

The correct groove location is defined by the mechanical design.

The ring may retain:

• bearing;

• gear;

• spacer;

• sleeve;

• pulley;

• another component.

There is no universal rule that a shaft retaining ring should always be positioned near a bearing.

Material Selection

Retaining-ring materials must provide the mechanical behavior required for installation and service.

Selection depends on:

• ring standard;

• load;

• geometry;

• corrosion environment;

• temperature;

• customer drawing.

Avoid assuming one material is universal for every retaining-ring standard.

Spring Steel Retaining Rings

Spring steel is widely used for retaining components because it can provide suitable elastic behavior.

However:

Spring Steel ≠ Corrosion-Proof

Environmental protection may be required.

Stainless Steel Retaining Rings

Stainless steel can provide improved corrosion resistance for appropriate environments.

Selection should still consider:

• required spring properties;

• temperature;

• chemicals;

• mating materials;

• load.

Stainless steel should not be described as universally corrosion-proof.

Surface Finish

Potential surface treatments depend on:

• material;

• corrosion environment;

• customer specification;

• dimensional requirements;

• assembly conditions.

Do not specify a coating only because it is common.

Hydrogen Embrittlement Considerations

Where hardened spring-steel retaining components undergo processes capable of introducing hydrogen, embrittlement risk may require consideration.

Risk depends on factors including:

• material condition;

• hardness;

• manufacturing route;

• coating process;

• applied stress.

There is no universal bake schedule appropriate for every retaining ring.

Packaging Is Not Surface Treatment

Packaging such as:

• plastic bags;

• oil paper;

• protective packaging

can help protect components during storage and transportation.

But packaging should not be confused with the actual surface finish or corrosion-protection specification.

Common Shaft Retaining Ring Failure Modes

Ring Pull-Out

Possible contributors:

• excessive axial load;

• incorrect groove;

• incomplete seating;

• wrong ring;

• shaft deformation.

Groove Deformation

Possible contributors:

• insufficient shaft strength;

• incorrect groove geometry;

• excessive axial force;

• impact.

Permanent Ring Deformation

Possible contributors:

• over-expansion;

• wrong installation tool;

• overload.

Partial Seating

Possible contributors:

• burrs;

• contamination;

• incorrect dimensions;

• ring distortion.

Corrosion

Corrosion can reduce effective section or interfere with serviceability.

Installation Damage

Incorrect tools can damage:

• lugs;

• holes;

• ring edges;

• surface coating.

Why “Type A vs Type B” Is Not Enough

Generic Type A / Type B terminology can be ambiguous across markets and suppliers.

Instead of purchasing by an informal type name, identify:

• applicable standard;

• ring geometry;

• shaft size;

• groove dimensions;

• material;

• finish.

For global OEM supply chains, this is much safer than relying on regional terminology.

Why Local Material Names Should Not Control Global RFQs

A customer should not have to interpret a local material designation to buy an international retaining ring.

For international sourcing, use:

• applicable standard material requirements;

• recognized international material designation where specified;

• controlled customer drawing.

This reduces ambiguity across suppliers and regions.

Shaft Retaining Ring Selection Decision Tree

A practical engineering decision process is:

Step 1 — Is the Component on a Shaft or Inside a Bore?

If shaft → continue with external retaining architecture.

If bore → evaluate internal retaining rings.

Step 2 — Metric or Inch?

Metric → DIN and other metric systems may be appropriate.

Inch → ASME B18.27 may be relevant.

Step 3 — Is Axial Installation Possible?

If yes → conventional external circlip may be practical.

If no → evaluate radial-install designs such as an appropriate E-ring or retaining washer.

Step 4 — What Is the Axial Load?

Determine the actual mechanical force.

Step 5 — What Groove Is Available?

Check:

• diameter;

• width;

• position;

• surrounding shaft section.

Step 6 — What Shaft Material Is Used?

Verify groove strength.

Step 7 — What Rotational Speed Applies?

Consider ring geometry where relevant.

Step 8 — What Environment Applies?

Select material and finish accordingly.

Step 9 — Is Service Removal Required?

Consider installation and maintenance access.

Step 10 — Validate the Assembly

Confirm fit, seating and retention before production release.

Shaft Retaining Ring Comparison Matrix

When Should You Use DIN 471?

Consider DIN 471 when:

• the shaft is metric;

• the drawing specifies DIN 471;

• a conventional external circlip architecture is required;

• the corresponding groove can be provided.

For detailed selection, see the JUXIN FASTENERS DIN 471 External Retaining Rings: Shaft Groove, Axial Load & Selection Guide.

When Should You Use ASME B18.27?

Consider ASME B18.27 when:

• the equipment uses inch dimensions;

• the drawing references ASME/ANSI retaining rings;

• a North American legacy replacement is required;

• the required NA ring type is known.

For detailed sourcing, see the JUXIN FASTENERS ASME B18.27 External Retaining Rings: Inch Shaft & NA1 Selection Guide.

When Should You Consider an E-Ring?

An E-ring may be worth evaluating when:

• radial installation is useful;

• shaft-end access is limited;

• assembly speed is important;

• the groove and load match the ring design.

Do not substitute an E-ring into a conventional circlip groove without verifying compatibility.

When Should You Consider Another Snap-Ring Geometry?

Alternative designs may be appropriate when the assembly requires:

• different installation access;

• different groove geometry;

• high rotational requirements;

• compact radial packaging;

• specific OEM architecture.

The decision should be engineering-driven rather than based only on catalogue availability.

Automotive and EV Equipment

Potential shaft-retaining applications include:

• electric motors;

• pumps;

• actuators;

• drive systems;

• gearboxes;

• seat mechanisms;

• thermal-management equipment.

Safety-critical automotive applications require customer-specific validation and qualification.

Electric Motors

Shaft retaining rings may locate:

• bearings;

• sleeves;

• rotor-related mechanical components;

• spacers.

For high-speed motors, rotational requirements should be included in the selection process.

Gearboxes and Transmissions

Potential retained components include:

• bearings;

• gears;

• spacers;

• sleeves.

Separate:

Axial Retention

from:

Torque Transmission

and:

Bearing Preload

These functions may require different components.

Pumps and Compressors

Retaining rings can locate appropriate:

• bearings;

• sleeves;

• internal shaft components.

They should not be treated as fluid seals.

Hydraulic and Pneumatic Equipment

Pressure acting on components can create axial force.

The retaining system should be selected from that mechanical force rather than from system pressure alone.

Industrial Automation and Robotics

Applications may include:

• actuators;

• rollers;

• motors;

• gear units;

• positioning mechanisms;

• compact drive systems.

Assembly access can make retaining-ring architecture particularly important.

AI Data Center and HPC Cooling Equipment

Potential equipment includes:

• pumps;

• motors;

• fans;

• blowers;

• liquid-cooling equipment.

Retaining rings may be used within these mechanical systems where their shaft architecture requires axial retention.

The data-center application itself does not determine the ring standard.

HVAC Equipment

Potential applications include:

• fans;

• blowers;

• pumps;

• motors;

• compressors;

• actuators.

The retaining ring provides axial mechanical retention rather than sealing or vibration isolation.

Power Equipment

Potential applications include:

• motors;

• generators;

• auxiliary rotating equipment;

• mechanical actuators.

Mechanical retention and electrical performance should be evaluated separately.

Industrial Machinery

Shaft retaining rings are common in:

• machine tools;

• conveyor equipment;

• packaging machinery;

• production equipment;

• material-handling systems;

• rotating machinery.

Construction and Agricultural Machinery

Applications may include:

• transmissions;

• hydraulic systems;

• bearings;

• gears;

• actuators;

• rotating mechanisms.

Shock and cyclic loads may require additional attention.

Rail and Transportation Equipment

Shaft retaining rings may be used in appropriate mechanical assemblies.

Safety-critical applications require the relevant customer and industry requirements.

Marine Equipment

For marine environments, evaluate:

• corrosion;

• salt exposure;

• material compatibility;

• surface finish.

Do not assume every standard spring-steel retaining ring is suitable for marine service.

Aerospace and MRO Equipment

Generic industrial retaining rings should not automatically be represented as aerospace-qualified components.

Drawing-based requirements for appropriate:

• tooling;

• ground-support equipment;

• MRO fixtures;

• non-flight-critical equipment

can be evaluated according to customer requirements.

Common Shaft Retaining Ring Selection Mistakes

Mistake 1: Selecting by Shaft Diameter Only

The groove and axial load also matter.

Mistake 2: Assuming the Ring Transfers Torque

Axial retention and torque transmission are different functions.

Mistake 3: Assuming the Ring Carries Radial Load

It should not replace the bearing system.

Mistake 4: Calling It a Vibration Damper

Elastic installation does not make it a damping device.

Mistake 5: Ignoring Metric vs Inch Standards

DIN and ASME geometries should not be mixed casually.

Mistake 6: Ignoring Installation Direction

Axial and radial installation can drive product selection.

Mistake 7: Ignoring the Groove

The groove is part of the load path.

Mistake 8: Over-Expanding the Ring

Installation damage can permanently alter geometry.

Mistake 9: Applying Lubricant Automatically

Follow the controlled assembly requirement.

Mistake 10: Applying Bolt Torque Instructions to a Circlip

A retaining ring is seated, not torqued.

Mistake 11: Using Generic Type A / Type B Names

Use the actual standard and geometry.

Mistake 12: Assuming Heavy Duty Is Always Better

The complete shaft and groove must match.

Engineer Search Intent

Engineers may search:

• shaft retaining ring;

• retaining ring types;

• external circlip;

• external snap ring;

• shaft circlip;

• DIN 471 vs E-ring;

• DIN 471 vs ASME retaining ring;

• E-ring vs circlip;

• retaining ring for bearing;

• shaft retaining ring groove;

• retaining ring axial load;

• retaining ring for high speed shaft;

• snap ring selection;

• external retaining ring selection.

These queries represent real engineering selection tasks.

Procurement Search Intent

Procurement teams may search:

• shaft retaining ring supplier;

• external circlip manufacturer;

• retaining ring manufacturer;

• DIN 471 supplier;

• ASME retaining ring supplier;

• E-ring supplier;

• snap ring manufacturer;

• stainless retaining ring supplier;

• spring steel retaining ring supplier;

• custom retaining ring manufacturer;

• OEM retaining ring supplier.

These queries carry stronger commercial intent.

Shaft Retaining Ring RFQ Checklist

For technical and commercial evaluation by JUXIN FASTENERS, provide where applicable:

• application;

• retained component;

• standard;

• ring type;

• nominal shaft size;

• metric or inch system;

• customer part number;

• drawing;

• shaft drawing;

• groove diameter;

• groove width;

• groove location;

• shaft material;

• shaft hardness where relevant;

• expected axial load;

• static or cyclic loading;

• shock or impact requirement;

• rotational speed;

• operating temperature;

• corrosion environment;

• ring material;

• surface finish;

• installation direction;

• installation method;

• removal requirement;

• dimensional tolerances;

• inspection requirement;

• documentation requirement;

• sample quantity;

• prototype quantity;

• production quantity;

• estimated annual demand;

• packaging requirement;

• labeling requirement;

• customer-specific requirements.

Frequently Asked Questions

What is a shaft retaining ring?

It is a mechanical retaining component used to restrict axial movement of another component mounted on a shaft.

What is another name for a shaft retaining ring?

Common terms include external retaining ring, external circlip, shaft circlip and external snap ring, although exact geometries can differ.

Does a shaft retaining ring transfer torque?

Its primary function is axial retention. Drive torque should normally be transferred by the intended key, spline, interference fit or other drive feature.

Does a retaining ring reduce vibration?

It should not be treated as a dedicated vibration-damping component.

What is DIN 471?

DIN 471 is the DIN standard for retaining rings for shafts in normal and heavy types.

What is the current DIN 471 edition?

DIN 471:2026-05 is the current edition.

What is ASME B18.27?

ASME B18.27 covers tapered and reduced-cross-section retaining rings in inch-series dimensions.

What is the difference between DIN 471 and ASME B18.27?

DIN 471 is primarily a metric shaft-retaining-ring standard. ASME B18.27 covers multiple inch-series retaining-ring types. Their rings and grooves should not be assumed interchangeable.

What is an E-ring?

An E-ring is a shaft-retention component with an E-shaped geometry that is typically installed radially into a matching groove.

Why would I use an E-ring instead of a conventional circlip?

Radial installation can be useful where shaft-end access is restricted or the assembly architecture favors side installation.

What is DIN 6799?

DIN 6799 covers retaining washers for shafts. It is a separate product family from DIN 471 retaining rings.

Are round-wire snap rings the same as DIN 471 rings?

No. Round-wire snap rings use a different cross section and corresponding groove/interface geometry.

Can I use a metric ring on an inch shaft?

Not based on approximate diameter conversion alone. Verify the standard, groove dimensions, tolerances and load requirements.

Can I reuse a shaft retaining ring?

Reuse should follow the OEM or equipment maintenance requirement and should not automatically be assumed.

Can JUXIN FASTENERS supply different shaft retaining ring types?

JUXIN FASTENERS can evaluate standard and drawing-based shaft-retaining requirements based on standard, 

ring geometry, shaft size, groove, material, finish, operating conditions and production quantity.

From “Shaft Circlip” to a Controlled OEM RFQ

A buyer may initially request:

“Shaft retaining ring, 20 mm, 100,000 pcs.”

That is not yet a complete production specification.

The next questions are:

DIN 471, ASME B18.27, E-Ring or Another Type?

Metric or Inch?

What Is the Groove Diameter?

What Is the Groove Width?

What Is Being Retained?

What Axial Load Must Be Transferred?

Is Axial Installation Possible?

What RPM Applies?

What Is the Shaft Material?

What Ring Material and Finish Are Required?

The commercial path becomes:

Application → Shaft → Axial Load → Installation Access → Groove → Standard → Ring Type → Material / Finish → Validation → Production RFQ

That is the difference between buying a ring that merely fits the shaft and sourcing a retaining system that matches the actual mechanical design.

Shaft Retaining Ring Solutions from JUXIN FASTENERS

JUXIN FASTENERS supports OEM sourcing of:

• shaft retaining rings;

• external retaining rings;

• external circlips;

• DIN 471 retaining rings;

• ASME B18.27 retaining rings;

• E-rings;

• retaining washers;

• snap rings;

• spring-steel retaining rings;

• stainless steel retaining rings;

• drawing-based retaining components.

Potential application sectors include:

• industrial machinery;

• automotive and EV equipment;

• electric motors;

• gearboxes;

• pumps and compressors;

• industrial automation;

• robotics;

• HVAC and liquid-cooling equipment;

• AI data center and HPC equipment;

• power equipment;

• construction machinery;

• agricultural machinery;

• rail-related equipment;

• marine equipment;

• MRO and legacy machinery.

For metric external shaft-retaining rings, refer to the JUXIN FASTENERS DIN 471 External Retaining Rings: Shaft Groove, Axial Load & Selection Guide.

For U.S. inch-series retaining rings, refer to the JUXIN FASTENERS ASME B18.27 External Retaining Rings: Inch Shaft & NA1 Selection Guide.

For internal bore-retaining systems, refer to the JUXIN FASTENERS DIN 472 Internal Retaining Rings: Bore Groove, Axial Load & Selection Guide.

For bearing preload rather than axial retention, refer to the JUXIN FASTENERS Bearing Preload Wave Washers: Load, Working Height, Tolerance Stack & Selection Guide.

For custom machined shaft and groove components, see Stainless Steel CNC Machining Parts.

For OEM shaft retaining ring RFQs, send your drawing, standard, shaft size, groove dimensions, retained component, axial load, rotational speed where relevant,

 material, finish, quantity and estimated annual demand to:

info@juxinfasteners.com

The best shaft retaining ring is not simply:

“the strongest ring that fits the shaft.”

It is:

“the retaining architecture whose standard, groove, axial capacity, installation method and material match the actual mechanical system.”