What happens when a small bearing is slightly wrong for its machine? Heat, noise, vibration, and unexpected downtime can quickly follow.

Deep groove ball bearings support motors, pumps, fans, gearboxes, and industrial equipment. However, similar model numbers can have very different dimensions and performance limits.

In this guide, we compare ten common deep groove ball bearings. You will learn their sizes, applications, design differences, and key selection factors.

Quick Comparison of 10 Common Deep Groove Ball Bearings

The table lists standard boundary dimensions. Load ratings and speed limits can vary. They depend on the manufacturer, seal, cage, clearance, and lubricant.

Dimensions should be checked against the final supplier datasheet. Load and speed data require model-specific verification.

What Makes Deep Groove Ball Bearings So Useful?

Deep groove ball bearings use deep raceways in both rings. The raceways closely follow the shape of each ball. This design creates a large contact area during operation.

They primarily carry radial loads. They can also support moderate axial loads in both directions. This feature makes them useful in compact machine assemblies.

Their non-separable design also simplifies installation. The inner ring, outer ring, balls, and cage form one unit. Many models support high rotational speeds when properly selected.

You can choose open, shielded, or sealed versions. Each design provides a different balance of speed and protection.

6000 Deep Groove Ball Bearing

The 6000 bearing has a 10 mm bore. Its outside diameter measures 26 mm. Its width is 8 mm.

This compact model suits equipment where space remains limited. It is often considered for small motors, instruments, light-duty drives, and compact rotating assemblies.

The 6000 has a smaller outside diameter than the 6200. Both models use a 10 mm bore. However, they should not be treated as direct replacements.

Choose the 6000 when compact dimensions matter most. Confirm the load requirement before making the final selection.

6001 Deep Groove Ball Bearing

The 6001 bearing uses a 12 mm bore. It has a 28 mm outside diameter and an 8 mm width.

It fits small fans, pumps, power tools, and electric equipment. Its narrow width supports compact machine designs. It can also reduce the required housing space.

Buyers should still check speed and contamination levels. An open version can support low-friction rotation. A sealed version provides more environmental protection.

6200 Deep Groove Ball Bearing

The 6200 bearing has a 10 mm bore. It measures 30 mm outside and 9 mm wide.

It provides a broader cross-section than the 6000. This difference can support different load requirements. It also requires a larger housing.

Common uses include electric motors, small conveyors, fans, and general industrial equipment. Open, ZZ, and 2RS options may be available.

Do not select it by bore diameter alone. Confirm the housing diameter, available width, load, and speed.

6201 Deep Groove Ball Bearing

The 6201 bearing uses a 12 mm bore. Its outside diameter is 32 mm. Its width is 10 mm.

This size is common in small motors, circulation pumps, fans, and electrical equipment. It offers more radial section than the 6001.

Choose the seal based on the operating environment. ZZ shields suit relatively clean conditions. The 2RS design offers stronger protection from dust and moisture.

6202 Deep Groove Ball Bearing

The 6202 bearing has a 15 mm bore. It measures 35 mm outside and 11 mm wide.

It is used in motors, power tools, agricultural assemblies, and compact drives. It works well where moderate capacity and compact size are both important.

Operating temperature can affect internal clearance. Tight fits can also reduce it. Buyers should confirm whether normal clearance or C3 clearance is required.

6203 Deep Groove Ball Bearing

The 6203 bearing has a 17 mm bore. Its outside diameter is 40 mm. Its width is 12 mm.

This model appears in pumps, gearboxes, motors, and auxiliary drive systems. It supports many general industrial applications.

Noise-sensitive equipment may require tighter vibration control. Higher speed applications may require a verified precision grade. The grease must also suit the operating temperature.

6204 Deep Groove Ball Bearing

The 6204 bearing has a 20 mm bore. It measures 47 mm outside and 14 mm wide.

It suits motors, conveyors, pumps, gearboxes, and automated equipment. Its size makes it a practical choice for many medium-duty assemblies.

Before ordering, check the full suffix. A 6204, 6204-ZZ, and 6204-2RS share basic dimensions. Their protection, friction, grease, and speed limits may differ.

6205 Deep Groove Ball Bearing

The 6205 bearing uses a 25 mm bore. It has a 52 mm outside diameter and a 15 mm width.

It is often selected for pumps, motors, gearboxes, agricultural machinery, and industrial drives. Its dimensions provide a balanced option for many 25 mm shafts.

However, it is not the only bearing using a 25 mm bore. The 6005, 6305, and 6405 have different outside dimensions. They also provide different capacity levels.

This comparison shows why shaft size alone is not enough.

6206 Deep Groove Ball Bearing

The 6206 bearing has a 30 mm bore. It measures 62 mm outside and 16 mm wide.

It suits larger electric motors, pumps, reducers, and transmission equipment. Its increased dimensions support more demanding applications than smaller 6200 models.

Installation practice becomes more important as load increases. Use correct mounting tools. Avoid striking the bearing rings or transmitting force through the balls.

6305 Deep Groove Ball Bearing

The 6305 bearing also uses a 25 mm bore. However, it has a 62 mm outside diameter and a 17 mm width.

It offers a larger cross-section than the 6205. This design generally supports greater radial capacity. It also needs more housing space.

The 6305 can suit heavier machinery, larger drives, and equipment facing higher radial loads. It should not replace a 6205 without reviewing the housing design.

6205 vs 6305: Why Similar Bore Sizes Can Mislead

Both bearings fit a nominal 25 mm shaft. Their remaining dimensions differ.

The 6305 may offer more radial capacity. Yet it also adds size and mass. Always compare confirmed load and speed ratings before changing models.

Open, ZZ, or 2RS: Which Design Should You Buy?

The basic bearing number identifies its dimensions. The suffix often describes its protection design.

Open bearings expose the balls and raceways. They suit clean systems using controlled lubrication.

ZZ bearings use metal shields on both sides. They block larger particles while maintaining relatively low resistance.

The 2RS design uses rubber seals on both sides. It offers stronger protection against contamination. Its limiting speed may be lower than an open version.

Suffix systems can vary by manufacturer. Confirm the exact designation before ordering.

How to Select the Right Deep Groove Ball Bearing

Confirm the Dimensions

Start with bore, outside diameter, and width. Check both shaft and housing dimensions. Never rely on bore size alone.

Review Radial and Axial Loads

Deep groove bearings mainly carry radial loads. They can accept moderate axial loads. High axial loads may require another bearing design.

Check Continuous and Maximum Speed

Speed affects heat, grease life, and cage behavior. Use the supplier’s verified speed limits. Do not copy data across brands.

Choose the Correct Seal

Select the seal based on dust, moisture, and maintenance access. Stronger sealing often creates more friction.

Select Internal Clearance

Fits and temperature can reduce installed clearance. C3 clearance may help in certain motors or warmer conditions. It is not a universal upgrade.

Confirm Precision and Noise Requirements

General machinery may use standard precision. High-speed motors may need tighter accuracy. Low-noise applications also need verified vibration grades.

Match the Lubricant to the Application

Grease must suit speed, load, and temperature. Too little grease can cause damage. Too much grease can increase heat.

Common Purchasing Mistakes

Many bearing failures begin before installation. Avoid these common mistakes:

• Ordering by bore diameter only

• Ignoring the complete model suffix

• Choosing C3 without checking the fit

• Treating ZZ and 2RS as identical

• Using unverified speed ratings

• Ignoring the operating temperature

• Replacing a bearing without checking housing dimensions

• Selecting the lowest price without quality records

A clear inquiry reduces these risks. It also helps suppliers provide faster technical confirmation.

Information to Send Your Bearing Supplier

Provide the complete bearing number when available. Include every suffix and clearance mark.

If the number is unknown, send these details:

• Shaft diameter

• Housing bore

• Available bearing width

• Radial and axial loads

• Continuous and maximum speed

• Operating temperature

• Dust or moisture exposure

• Required seal type

• Precision or noise requirement

• Required quantity

A drawing or clear bearing photo may also help. It should show markings and key dimensions.

Frequently Asked Questions

Which deep groove ball bearing is most common?

There is no universal best model. The 6200 range appears in many machines. The correct model still depends on size, load, speed, and environment.

Can a 6205 replace a 6305?

No direct replacement should be assumed. They share a 25 mm bore but have different outside diameters and widths.

Is a 2RS bearing better than a ZZ bearing?

It depends on the application. The 2RS design offers stronger protection. ZZ can provide lower friction at higher speeds.

Do deep groove ball bearings carry axial loads?

Yes, they can carry moderate axial loads in both directions. The allowed load depends on design, clearance, speed, and operating conditions.

When should C3 clearance be used?

C3 may suit tighter fits or higher operating temperatures. The final selection should follow an engineering review.

What causes early bearing failure?

Common causes include contamination, poor lubrication, overload, misalignment, incorrect clearance, and mounting damage.

Choose the Bearing by Application, Not Popularity

These ten models provide a useful starting point. They cover many common shaft sizes and equipment types. Still, popularity does not guarantee compatibility.

Start with the required dimensions. Then review load, speed, seal, clearance, and precision. This process reduces replacement risk and improves operating reliability.

VBA Bearing supplies deep groove ball bearings for motors and industrial machinery. For 10–100 mm bore options, review the 6200–6220 single row deep groove ball bearings.

Send your bearing number, operating conditions, and quantity. The VBA team can help confirm dimensions and available configurations.

CTA: Send Your Bearing List | Request Technical Data | Get a Quote

References and Further Reading

The following independent resources provide additional engineering context. They are not competing bearing suppliers.

• Understanding Bearing Lubrication – Machinery Lubrication
  This technical blog explains how lubrication affects friction, heat, wear, and bearing service life.

• Bearings Questions – Engineering Stack Exchange
  This engineering forum collects practical discussions about bearing selection, fits, preload, clearance, and machine design.

• Rolling-Element Bearing Life Prediction – NASA Technical Reports Server
  This technical reference provides deeper background on rolling-element bearing life and fatigue calculations.

These resources provide general guidance. Always use the confirmed VBA datasheet when selecting a specific model, load rating, or speed limit.