ASME B18.27 External Retaining Rings: Inch Shaft & NA1 Selection Guide

When an engineer or buyer searches for an “ASME shaft retaining ring,” identifying the correct standard is only the beginning.

The next questions are:

Which ASME B18.27 retaining-ring type is required?

What inch shaft size and groove does it fit?

What axial load must the ring-and-groove system retain?

Is the requirement a current production design or a replacement for a legacy U.S. drawing?

These questions matter because ASME B18.27 does not describe only one external retaining ring.

The standard covers multiple tapered and reduced-cross-section retaining-ring configurations for inch-series shafts and housings.

For the conventional external shaft-retaining-ring configuration, an important designation is:

External Type NA1

JUXIN FASTENERS supports standard and drawing-based retaining rings for U.S. inch-series OEM, replacement and industrial sourcing requirements.

What Is ASME B18.27?

ASME B18.27 covers:

Tapered and Reduced Cross Section Retaining Rings — Inch Series

The current standard designation is:

ASME B18.27-1998 (S2022)

The standard provides general and dimensional data for multiple types of retaining rings used with nominal inch-series shafts and housings and corresponding recommended grooves.

This makes ASME B18.27 particularly relevant to:

• U.S. machinery;

• North American OEM equipment;

• legacy inch-series drawings;

• industrial replacement parts;

• MRO sourcing;

• equipment designed around inch shaft and bore dimensions.

Important Correction: ASME B18.27.2 Type A Is Not the Current Designation

Older product descriptions, supplier pages or internal records may use inconsistent terminology such as:

ASME B18.27.2 Type A

For current engineering and procurement work, the recognized ASME standard is:

ASME B18.27-1998 (S2022)

and the conventional external ring covered by the standard is identified as:

External Type NA1

Therefore, an RFQ should not rely on an ambiguous description when the exact standard and ring type can be identified.

What Is an ASME B18.27 External Type NA1 Retaining Ring?

An External Type NA1 retaining ring is installed into a groove on the outside of a shaft.

The ring creates an axial retaining shoulder that restricts movement of a component along the shaft.

Typical retained components may include:

• bearings;

• gears;

• spacers;

• sleeves;

• pulleys;

• mechanical subassemblies.

The basic retention system is:

Retained Component → External Retaining Ring → Shaft Groove → Shaft

The shaft groove is therefore part of the functional retaining system.

Retaining Ring + Groove + Shaft = One System

A retaining ring should not be evaluated independently from the shaft.

When axial load acts on the retained component, force passes through the ring and into the groove.

Conceptually:

Component Axial Force → Ring → Groove Face → Shaft

The functional capacity can therefore depend on:

• ring geometry;

• groove geometry;

• shaft material;

• shaft strength;

• axial load;

• installation condition.

A ring that physically fits the groove is not automatically validated for the application.

What Does “Tapered Cross Section” Mean?

Many conventional retaining rings are designed so that their radial cross section changes around the circumference.

This geometry helps the ring behave appropriately when expanded or compressed for installation and when seated in the groove.

The geometry should not be altered casually in a replacement part.

For OEM sourcing, the correct standard type or customer drawing should control the configuration.

What Does “Reduced Cross Section” Mean?

ASME B18.27 also includes reduced-cross-section retaining-ring designs.

These represent additional geometries within the standard rather than one universal external circlip.

This is why an RFQ stating only:

“ASME retaining ring”

may not completely identify the required component.

ASME B18.27 Covers More Than External Type NA1

The standard includes multiple retaining-ring configurations.

Among the listed types are:

• External Type NA1;

• Internal Type NA2;

• E-Ring Type NA3;

• Heavy Duty External Type NA4;

• Reinforced E-Rings Type NA5;

• C-Rings Type NA6;

• Bowed External Rings Type NA7;

• Bowed Internal Rings Type NA8;

• Bowed External E-Rings Type NA9;

• Inverted External Type NA10;

• Inverted Internal Type NA11;

• Beveled External Type NA12;

• Beveled Internal Type NA13;

• External Self-Locking Rings Type NA14;

• External Interlocking Rings Type NA15;

• External Bowed Locking Prongs Rings Type NA16.

This creates an important sourcing rule:

ASME B18.27 ≠ One Retaining Ring Geometry

The type designation matters.

External Type NA1

NA1 is the conventional external retaining-ring category within ASME B18.27.

It is relevant where the assembly requires a ring installed in an external shaft groove.

The design question should be:

Is NA1 the required configuration for this shaft and load case?

rather than:

Does any external circlip fit?

Internal Type NA2

NA2 applies to internal retaining-ring geometry for housing or bore applications.

Therefore:

NA1 → External / Shaft

NA2 → Internal / Housing or Bore

These should not be confused during procurement.

E-Ring Type NA3

An E-ring uses a different geometry and installation concept from a conventional plier-installed external ring.

E-rings can be useful where assembly architecture favors radial installation.

However:

NA3 E-Ring ≠ NA1 External Ring

Even where both retain components on shafts, their groove and installation requirements differ.

Heavy Duty External Type NA4

ASME B18.27 also includes Heavy Duty External Type NA4.

The existence of a heavy-duty type does not mean it should automatically replace NA1.

The correct type depends on:

• drawing;

• shaft geometry;

• groove;

• axial load;

• available space;

• assembly method.

“Heavy duty” should be treated as a specific standard configuration, not as a marketing adjective.

Standard Type vs Heavy-Duty Type

For engineering selection, ask:

What load must be retained?

What shaft and groove geometry is available?

Which ASME B18.27 type is specified?

Is the application new design or legacy replacement?

Do not assume:

Higher Section Size = Automatically Better Design

Changing ring type can also require changing the groove and surrounding geometry.

ASME B18.27 vs DIN 471

This distinction is commercially important.

DIN 471 and ASME B18.27 can both relate to external shaft-retaining rings, but they belong to different dimensional systems and standards frameworks.

DIN 471

Primarily associated with metric external retaining rings for shafts.

ASME B18.27

Covers inch-series tapered and reduced-cross-section retaining rings, including multiple external, internal and specialized forms.

Therefore:

DIN 471 → Metric Shaft-Ring Search Intent

ASME B18.27 → U.S. Inch-Series Retaining-Ring Search Intent

They should not be treated as automatic dimensional equivalents.

Inch Size Is Not a Metric Size Written Differently

A common sourcing mistake is to convert an inch nominal size to its approximate metric value and then select a metric circlip.

For example:

Inch Shaft → Approximate Millimeter Conversion → Metric Ring

does not establish equivalence.

The groove dimensions, ring geometry and tolerances may differ.

For replacement programs:

Identify Original Standard First → Verify Groove → Compare Candidate Replacement → Approve Substitution

Why This Matters for U.S. Legacy Machinery

Industrial equipment can remain in service for decades.

Maintenance teams may encounter drawings containing:

• older ASME references;

• ANSI references;

• manufacturer part numbers;

• obsolete supplier numbers;

• inch shaft dimensions;

• incomplete retaining-ring descriptions.

The correct replacement process should begin with technical identification rather than visual similarity.

Legacy Retaining Ring Identification

If the original part number is unavailable, collect:

• shaft diameter;

• groove diameter;

• groove width;

• ring thickness;

• ring geometry;

• lug geometry;

• free diameter;

• material if known;

• surface finish;

• equipment model;

• original drawing or sample.

A physical sample can be useful, but wear or permanent deformation should be considered.

Do Not Copy a Used Ring Without Checking the Groove

A used retaining ring may have:

• permanent expansion;

• wear;

• corrosion;

• installation damage;

• distorted lugs.

Therefore, reverse engineering should include the shaft groove wherever possible.

The groove often provides more reliable information about the intended ring than a damaged used sample alone.

Shaft Groove Geometry

The shaft groove controls the ring's engagement and axial position.

Important variables include:

• groove diameter;

• groove width;

• groove location;

• groove corner geometry;

• shaft material;

• nearby shoulders.

The applicable ASME dimensions or controlled drawing should govern the groove.

Groove Diameter

Groove diameter influences:

• ring engagement;

• remaining shaft section;

• installed ring geometry.

A groove that is too shallow or too deep can affect retention.

Therefore:

Deeper Groove ≠ Automatically Stronger Groove

Groove Width

Groove width influences axial ring fit.

Incorrect width can create:

• excessive clearance;

• poor seating;

• assembly interference;

• uneven load transfer.

Groove Location

The groove's axial location determines the position of the retained component.

This can influence:

• bearing position;

• gear alignment;

• spacer stack;

• end play;

• assembly tolerance.

Groove position may therefore be a functional dimension.

Shaft Material and Groove Strength

The shaft must support the axial load transferred through the groove.

Potential limiting conditions can include:

• groove-edge deformation;

• shaft yielding;

• local shear;

• ring deformation.

A higher-strength retaining ring cannot compensate for an inadequately designed groove.

Axial Load Is the Primary Functional Load

External retaining rings are primarily axial-retention components.

Potential axial loads can come from:

• bearing thrust;

• gear reaction;

• spring force;

• actuator force;

• assembly loads;

• transient mechanical events.

The actual loading should be identified before selecting the retaining system.

Radial Load Is Not the Primary Retention Function

The old description of a retaining ring as carrying both axial and radial loads can be misleading.

The primary retention task is normally axial.

Radial forces within the machine should be carried by the intended bearing, shaft or other structural components.

Therefore:

Retaining Ring ≠ Radial Bearing

Retaining Rings Are Not Vibration Dampers

Another common description is that retaining rings “absorb vibration.”

That is not their primary engineering function.

A conventional retaining ring is a mechanical axial-retention component.

Therefore:

Elastic Installation Behavior ≠ Vibration Damping

If vibration isolation is required, use an appropriate vibration-control strategy.

Retaining Rings Are Not Shock Absorbers

The ring may experience transient axial loading, but it should not automatically be marketed as a shock absorber.

Shock loading should instead be included in the mechanical load case.

Retaining Rings Do Not Automatically Reduce Noise

Noise reduction depends on the complete mechanical system.

Installing a retaining ring does not inherently create a low-noise assembly.

The ring's function is retention.

External Ring Installation

A conventional external retaining ring is expanded during installation so that it can pass over the shaft.

A general sequence is:

1. Verify ring type and size.

2. Inspect the shaft and groove.

3. Engage the correct installation tool.

4. Expand the ring only as much as necessary.

5. Move the ring into the groove position.

6. Release it in a controlled manner.

7. Verify complete seating.

The exact procedure depends on the retaining-ring design.

Do Not Over-Expand During Installation

The ring must deform elastically during installation.

However:

Necessary Expansion ≠ Unlimited Expansion

Over-expansion can cause:

• permanent set;

• lug damage;

• distortion;

• reduced spring recovery;

• poor seating.

Installation tooling is therefore part of retaining-ring process control.

Full Seating Is Critical

After installation, verify that the ring is fully engaged with the groove.

Partial seating can result from:

• burrs;

• contamination;

• wrong ring;

• incorrect groove;

• ring deformation;

• poor installation technique.

A partially seated ring can compromise axial retention.

Groove Burrs and Surface Condition

Machining burrs can interfere with seating and damage the ring.

The shaft groove should therefore be inspected as part of the complete assembly.

Retaining Ring Pliers

Many conventional lugged external rings use appropriate retaining-ring pliers.

Tool selection should consider:

• ring size;

• lug-hole geometry;

• required expansion;

• production volume;

• operator control.

Incorrect plier tips can damage the installation holes.

Automated Assembly

High-volume OEM production may use dedicated installation equipment.

Automation can improve:

• repeatability;

• cycle time;

• process control.

However, automated installation should still control:

• ring orientation where relevant;

• expansion;

• groove location;

• seating verification.

Automation does not compensate for an incorrect ring or groove.

Can ASME B18.27 Rings Be Reused?

Reuse should not automatically be assumed.

Inspect for:

• permanent deformation;

• excessive expansion;

• corrosion;

• wear;

• damaged lugs;

• damaged installation holes;

• loss of spring recovery.

Follow the equipment manufacturer's maintenance requirements for critical applications.

Material Selection

Retaining rings require material properties suitable for elastic installation and mechanical retention.

Potential material systems depend on:

• standard requirement;

• customer drawing;

• corrosion environment;

• operating temperature;

• mechanical load.

Material should not be inferred only from the ring's appearance.

Spring Steel Retaining Rings

Spring steels are commonly associated with retaining-ring applications because they can provide the elastic behavior required during installation.

The actual material and heat treatment should match the product specification.

Spring steel does not automatically provide sufficient corrosion resistance for every environment.

Stainless Steel Retaining Rings

Stainless steel may be selected for improved corrosion resistance in appropriate environments.

However:

Stainless Steel ≠ Corrosion-Proof

The application should still consider:

• moisture;

• chemicals;

• temperature;

• galvanic compatibility;

• mechanical properties.

Surface Finishes

Surface treatment should be specified according to the actual environmental and customer requirements.

For hardened spring-steel components, processing should consider hydrogen-embrittlement risk where applicable.

Do not assign a universal corrosion-life claim based only on coating name.

High-Speed Rotating Equipment

External retaining rings can be installed on rotating shafts.

At higher rotational speeds, the designer should consider the specific retaining-ring geometry and complete rotating system.

ASME-related engineering literature notes that tapered-section rings with lugs can introduce imbalance considerations at higher rotational speeds.

Therefore:

Fits the Shaft ≠ Automatically Suitable for Unlimited RPM

Rotational requirements should be included in engineering evaluation.

Ring Balance and Rotational Speed

A lugged retaining ring is not perfectly rotationally symmetric.

For many ordinary industrial applications this may not control the design.

For high-speed equipment, however, rotating mass distribution can become relevant.

Possible alternatives may include other retaining-ring architectures where the application requires them.

The correct choice depends on:

• RPM;

• shaft diameter;

• ring mass;

• surrounding geometry;

• equipment balance requirements.

Static vs Cyclic Loading

A ring subjected to constant axial load and a ring exposed to repeated axial load can experience different service conditions.

Evaluate:

• load magnitude;

• load direction;

• cycle frequency;

• impact;

• service life requirement.

Do not convert a dimensional standard into an unsupported universal fatigue rating.

Common Failure Mode: Ring Pull-Out

A retaining ring can leave or partially leave its groove if the retention system is unsuitable.

Possible contributors include:

• incorrect groove;

• excessive axial force;

• incomplete seating;

• ring deformation;

• groove failure;

• wrong ring type.

The cause should be diagnosed before simply installing a stronger ring.

Common Failure Mode: Groove Deformation

If the shaft or groove cannot support the transferred load, the groove edge may deform.

Possible contributors include:

• weak shaft material;

• insufficient groove geometry;

• excessive axial force;

• impact loading.

The solution may require a shaft-design change rather than only a ring change.

Common Failure Mode: Permanent Ring Expansion

This can result from:

• over-expansion during installation;

• incorrect tooling;

• excessive rotational effects;

• overload.

A permanently expanded ring may no longer seat correctly.

Common Failure Mode: Lug Damage

Installation lugs can be damaged by:

• incorrect pliers;

• excessive expansion;

• repeated installation;

• poor handling.

Damaged rings should be evaluated before reuse.

Common Failure Mode: Corrosion

Corrosion can reduce section thickness or affect removal and serviceability.

Material and finish should be matched to the actual environment.

External Type NA1 vs Heavy Duty External Type NA4

Both belong to ASME B18.27, but they represent different retaining-ring configurations.

A practical selection process is:

Check Drawing → Identify Type → Confirm Shaft and Groove → Determine Axial Load → Verify Material / Finish → Validate Assembly

Do not substitute NA4 for NA1 simply because “heavy duty” sounds stronger.

External Type NA1 vs E-Ring NA3

Both may be used on shafts, but installation architecture differs.

NA1 is a conventional external ring.

NA3 is an E-ring configuration.

The groove and installation method must match the selected ring.

External Type NA1 vs DIN 471

For global OEM sourcing, this comparison is especially important.

ASME B18.27 vs ASME B27.7

ASME also maintains B27.7, which covers general-purpose tapered and reduced-cross-section retaining rings in metric dimensions.

Therefore:

ASME B18.27 → Inch Series

ASME B27.7 → Metric Series

ASME currently lists B27.7-1977 (S2022) as remaining in effect under stabilized maintenance.

This distinction can be useful for U.S.-standard equipment using either inch or metric retaining-ring systems.

ASME B18.27 vs Spiral Retaining Rings

ASME also maintains B27.6, covering general-purpose uniform-cross-section spiral retaining rings.

A spiral retaining ring differs substantially from a conventional tapered-section lugged circlip.

Potential differences include:

• cross-section geometry;

• installation method;

• rotational balance;

• groove interaction.

Therefore:

Conventional Circlip ≠ Spiral Retaining Ring

The correct architecture depends on the application.

Automotive and EV Equipment

ASME inch-series retaining rings may appear in:

• North American machinery;

• automotive production equipment;

• pumps;

• motors;

• actuators;

• drive systems;

• thermal-management equipment.

Safety-critical vehicle applications require the applicable customer specification and qualification.

Industrial Machinery

ASME B18.27 retaining rings can be relevant to:

• machine tools;

• conveyor equipment;

• packaging machinery;

• material-handling systems;

• industrial drives;

• bearing housings;

• rotating equipment.

They are particularly relevant where the machine architecture uses inch-series shafts.

Pumps and Compressors

Potential uses include axial retention of appropriate:

• bearings;

• sleeves;

• spacers;

• shaft-mounted components.

The retaining ring itself is not a fluid seal.

Electric Motors

External retaining rings may locate shaft-mounted components in suitable motor designs.

Rotational speed and rotor dynamics should be considered separately from basic dimensional fit.

Gearboxes and Power Transmission

Potential retained components include:

• bearings;

• gears;

• spacers;

• sleeves.

The ring provides axial retention.

It should not automatically be treated as the primary torque-transmission feature.

HVAC and Cooling Equipment

Potential applications include:

• fans;

• blowers;

• pumps;

• motors;

• compressors;

• actuators.

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

AI Data Center and HPC Cooling Equipment

Mechanical equipment within AI data center and HPC infrastructure can include:

• pumps;

• fans;

• blowers;

• motors;

• liquid-cooling equipment.

ASME inch-series retaining rings may be relevant where the underlying mechanical component uses an inch shaft-retention architecture.

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

Power Generation Equipment

Potential applications may include appropriate:

• motors;

• generators;

• pumps;

• auxiliary machinery.

The actual shaft, groove, speed and axial-load requirements should control selection.

Construction and Agricultural Machinery

North American mobile equipment may contain inch-series retaining components in:

• transmissions;

• hydraulic systems;

• drive equipment;

• bearings;

• actuators.

Shock and cyclic loading should be evaluated where relevant.

Marine Equipment

Material and surface treatment should account for:

• moisture;

• salt exposure;

• galvanic interaction;

• maintenance environment.

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

Aerospace and Aviation

A generic ASME B18.27 industrial retaining ring should not automatically be represented as aerospace-qualified hardware.

Aerospace programs may require dedicated:

• aerospace standards;

• approved materials;

• traceability;

• inspections;

• supplier qualification.

Drawing-based tooling, ground-support and appropriate MRO requirements can be evaluated according to customer specifications.

ASME B18.27 Selection Matrix

Common ASME B18.27 Sourcing Mistakes

Mistake 1: Specifying “ASME B18.27.2 Type A”

Use the actual applicable ASME B18.27 designation and ring type rather than relying on ambiguous legacy terminology.

Mistake 2: Assuming B18.27 Means One Ring

The standard covers multiple NA ring types.

Mistake 3: Selecting Only by Shaft Diameter

The groove and axial load also matter.

Mistake 4: Treating Inch and Metric Rings as Interchangeable

Approximate diameter conversion does not establish equivalence.

Mistake 5: Ignoring Groove Geometry

The groove is part of the retention system.

Mistake 6: Calling the Ring a Vibration Damper

Its primary function is axial retention.

Mistake 7: Assuming the Ring Carries Radial Bearing Load

The primary retaining function is axial.

Mistake 8: Assuming It Transmits Drive Torque

Torque transmission normally requires the appropriate shaft-drive feature.

Mistake 9: Ignoring RPM

Rotating equipment may require additional ring-geometry evaluation.

Mistake 10: Over-Expanding During Installation

Permanent deformation can compromise seating.

Mistake 11: Assuming a Used Sample Still Has Original Dimensions

Service and installation can permanently change the ring.

Mistake 12: Assuming Heavy Duty Is Automatically Better

The groove and complete assembly must match the selected type.

Engineer Search Intent

Engineers may search:

• ASME B18.27 retaining ring;

• ASME external retaining ring;

• NA1 retaining ring;

• inch retaining ring;

• inch shaft circlip;

• external snap ring inch;

• retaining ring groove dimensions;

• ASME circlip standard;

• ASME B18.27 vs DIN 471;

• NA1 vs NA4 retaining ring;

• inch shaft retaining ring;

• high speed retaining ring.

These searches often indicate an active engineering, replacement or troubleshooting task.

Procurement Search Intent

Procurement teams may search:

• ASME B18.27 supplier;

• NA1 retaining ring supplier;

• inch retaining ring manufacturer;

• external retaining ring supplier USA standard;

• inch circlip manufacturer;

• spring steel retaining ring supplier;

• stainless retaining ring supplier;

• OEM retaining ring manufacturer;

• legacy retaining ring replacement;

• custom inch retaining ring supplier.

These searches indicate stronger commercial sourcing intent.

ASME B18.27 RFQ Checklist

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

• ASME B18.27 designation;

• ring type, such as NA1;

• nominal inch shaft size;

• customer part number;

• original drawing;

• shaft drawing;

• groove diameter;

• groove width;

• groove location;

• shaft material;

• shaft hardness where relevant;

• retained component;

• expected axial load;

• static or cyclic load condition;

• shock or impact requirement;

• rotational speed where relevant;

• operating temperature;

• corrosion environment;

• ring material;

• surface finish;

• installation method;

• removal and service requirement;

• dimensional tolerances;

• inspection requirements;

• documentation requirements;

• legacy sample where applicable;

• sample quantity;

• prototype quantity;

• production quantity;

• estimated annual demand;

• packaging requirement;

• labeling requirement;

• customer-specific requirements.

Frequently Asked Questions

What is ASME B18.27?

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

What is the current ASME B18.27 designation?

The current listed standard is ASME B18.27-1998 (S2022).

What is an NA1 retaining ring?

NA1 is the external retaining-ring type listed in ASME B18.27 for shaft applications.

Does ASME B18.27 cover only external retaining rings?

No. It includes external, internal, E-ring, heavy-duty, bowed, inverted, beveled and other retaining-ring configurations.

What is the difference between NA1 and NA2?

NA1 is an external ring for shaft applications. NA2 is an internal ring for housing or bore applications.

What is the difference between NA1 and NA4?

NA1 is the conventional external type, while NA4 is the heavy-duty external type within the ASME B18.27 family.

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

ASME B18.27 covers inch-series retaining rings and multiple configurations. DIN 471 covers metric retaining rings for shafts. They should not be treated as automatically interchangeable.

What is the difference between ASME B18.27 and ASME B27.7?

ASME B18.27 is the inch-series standard, while ASME B27.7 covers metric general-purpose tapered and reduced-cross-section retaining rings.

Are retaining rings vibration dampers?

No. Their primary function is mechanical axial retention.

Do external retaining rings carry radial bearing load?

They should not be treated as radial bearings. Their primary retaining function is axial.

Can an external retaining ring transmit shaft torque?

It should not automatically be used as the primary torque-transfer feature. Keys, splines, interference fits or other features may be required.

Can I replace an inch retaining ring with a metric DIN 471 ring?

Not based on nominal diameter conversion alone. Ring geometry, groove dimensions, tolerances and the complete assembly should be checked.

Are external retaining rings suitable for high-speed shafts?

They can be used in rotating systems, but rotational speed, ring geometry and equipment balance should be evaluated for the actual application.

Can JUXIN FASTENERS supply ASME B18.27 retaining rings?

JUXIN FASTENERS can evaluate standard, legacy and drawing-based retaining-ring requirements using the applicable ring type, shaft and groove dimensions, material, finish and production quantity.

From “1-Inch Shaft Retaining Ring” to a Controlled OEM RFQ

A buyer may initially request:

“External retaining ring for 1-inch shaft, 50,000 pcs.”

That does not completely define the part.

The supplier may still need to know:

ASME B18.27 or Another Standard?

NA1 or Another Ring Type?

What Is the Actual Shaft Diameter?

What Is the Groove Diameter?

What Is the Groove Width?

What Component Is Being Retained?

What Axial Load Must Be Carried?

What RPM Applies?

What Material Is Required?

What Surface Finish Is Required?

Is This a New Design or Legacy Replacement?

The sourcing path becomes:

Drawing / Application → Inch Shaft → ASME B18.27 Type → Groove → Axial Load → RPM → Material / Finish → Sample Verification → Validation → Production RFQ

This is the difference between sourcing a ring that simply fits an inch shaft and sourcing the correct retaining system for the actual equipment.

ASME B18.27 Retaining Ring Solutions from JUXIN FASTENERS

JUXIN FASTENERS supports OEM and replacement sourcing for:

• ASME B18.27 retaining rings;

• External Type NA1 retaining rings;

• inch-series external retaining rings;

• inch shaft circlips;

• external snap rings;

• heavy-duty retaining rings where specified;

• spring-steel retaining rings;

• stainless steel retaining rings;

• legacy replacement retaining rings;

• drawing-based retaining components.

Potential application sectors include:

• industrial machinery;

• North American OEM equipment;

• automotive and EV equipment;

• electric motors;

• gearboxes;

• pumps and compressors;

• industrial automation;

• HVAC equipment;

• AI data center and HPC cooling equipment;

• power equipment;

• construction machinery;

• agricultural machinery;

• material-handling systems;

• marine equipment;

• MRO and legacy machinery.

For metric external shaft-retaining systems, refer to the JUXIN FASTENERS DIN 471 External Retaining Rings: Shaft Groove, Axial Load & 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 simple axial retention, refer to the JUXIN FASTENERS Bearing Preload Wave Washers: Load, Working Height, Tolerance Stack & Selection Guide.

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

For OEM ASME B18.27 retaining-ring RFQs, send the standard designation, ring type, drawing, inch shaft size, groove dimensions, shaft material, axial load, 

rotational speed where relevant, material, finish, quantity and estimated annual demand to:

info@juxinfasteners.com

For ASME inch-series retaining rings, the correct sourcing question is not simply:

“What ring fits this shaft?”

It is:

“Which ASME B18.27 ring type, shaft groove and material combination matches the actual axial-retention requirement?”