Selecting the correct tapered roller bearing requires more than simply matching the shaft diameter. Engineers, maintenance teams, and purchasing professionals must evaluate bearing dimensions, load capacity, contact angle, installation configuration, operating conditions, and replacement compatibility before making a final decision.

A reliable tapered roller bearing size chart helps users quickly compare bearing models by checking important specifications, including bore diameter, outside diameter, bearing width, dynamic load rating, and static load rating.

This taper roller bearing dimensions chart and selection guide provides practical information about common metric tapered roller bearing sizes, bearing number identification, contact angle selection, matched pair installation, and replacement considerations.

Whether you are sourcing bearings for OEM equipment, industrial machinery, agricultural applications, or aftermarket replacement, proper bearing selection can reduce downtime, improve equipment reliability, and optimize long-term operating costs.

Tapered Roller Bearing Size Chart (Metric Dimensions)

The following tapered roller bearing size chart includes commonly used metric tapered roller bearing models from 300 series designs.

For example:

• 30205 tapered roller bearing dimensions
  • Bore diameter: 25 mm
  • Outside diameter: 52 mm
  • Width: 16.25 mm
• 30206 tapered roller bearing size
  • Bore diameter: 30 mm
  • Outside diameter: 62 mm
  • Width: 17.25 mm
• 30306 tapered roller bearing dimensions
  • Bore diameter: 30 mm
  • Outside diameter: 72 mm
  • Width: 20.75 mm

Note: Bearing dimensions and load ratings may vary depending on manufacturer design, material specifications, internal clearance, and precision grade. Always verify final specifications before replacement.

Taper Roller Bearing Dimensions Chart Explained

A taper roller bearing dimensions chart normally includes several key parameters that determine bearing compatibility and performance.

Bore Diameter (d)

The bore diameter represents the inner diameter of the bearing.

It determines:

• Shaft compatibility
• Mounting fit
• Installation accuracy

For example:

A 30206 tapered roller bearing has a 30 mm bore diameter.

Incorrect bore selection may result in:

• Poor fitting
• Excessive vibration
• Reduced bearing life

Outside Diameter (D)

The outside diameter defines the required housing space.

Before selecting a replacement bearing, engineers should confirm:

• Housing bore size
• Installation clearance
• Mounting position

Bearing Width (T)

The bearing width affects:

• Load capacity
• Axial positioning
• Installation space

A wider bearing generally provides higher load capacity but requires additional axial installation space.

Dynamic and Static Load Ratings

Dynamic Load Rating (C)

Dynamic load rating indicates the bearing's ability to support rotating loads.

It is mainly used for calculating bearing life under continuous operation.

Static Load Rating (C0)

Static load rating is important when bearings experience:

• Shock loads
• Heavy impact loads
• Low-speed operation

How to Identify Tapered Roller Bearing Numbers

Understanding bearing designation helps engineers quickly identify bearing dimensions.

Example:

30206 Tapered Roller Bearing

The designation includes:

30

Bearing series code.

It identifies the bearing design characteristics.

206

Bore designation.

For standard metric tapered roller bearings:

The last two digits × 5 represent the bore diameter.

Example:

06 × 5 = 30 mm

Therefore:

30206 = 30 mm bore tapered roller bearing

Common examples:

Common Tapered Roller Bearing Series

302 Series

The 302 series is one of the most widely used tapered roller bearing series.

Characteristics:

• Compact structure
• Smaller contact angle
• Good radial load capability
• Suitable for general applications

Common applications:

• Gearboxes
• Pumps
• Industrial machinery
• Agricultural equipment

303 Series

The 303 series provides higher load capacity compared with the 302 series.

Characteristics:

• Medium contact angle
• Balanced radial and axial load performance
• Larger roller design

Applications:

• Trucks
• Construction machinery
• Transmission systems

313 Series

The 313 series is designed for applications requiring higher axial load capacity.

Characteristics:

• Larger contact angle
• Higher thrust load capability
• Increased stiffness

Applications:

• Heavy machinery
• Mining equipment
• Industrial gear systems

Contact Angle and Load Capacity Selection

The contact angle is one of the most important factors affecting tapered roller bearing performance.

The contact angle determines how the bearing distributes radial and axial loads.

Smaller Contact Angle

A smaller contact angle provides:

• Higher radial load capability
• Better suitability for applications where radial forces dominate

Typical example:

302 Series

Common applications:

• Gear systems
• General industrial equipment

Larger Contact Angle

A larger contact angle provides:

• Higher axial (thrust) load capability
• Better resistance against heavy thrust forces

Typical example:

313 Series

Common applications:

• Heavy-duty machinery
• High axial load applications

Contact Angle Comparison

Selecting the wrong contact angle may result in:

• Excessive heat generation
• Reduced bearing life
• Poor load distribution

Tapered Roller Bearing Matched Pair Selection and Preload Adjustment

Unlike many deep groove ball bearings, tapered roller bearings are often installed as matched pairs to support combined loads and improve operating stability.

A single tapered roller bearing can support radial loads and axial loads in one direction. When equipment experiences axial forces in both directions, paired installation is usually required.

Back-to-Back Arrangement (DB)

In a DB arrangement, the wider ends of two bearings face outward.

Advantages:

• Higher rigidity
• Better resistance to overturning moments
• Improved shaft support

Typical applications:

• Gearboxes
• Machine tools
• Precision transmission systems

Face-to-Face Arrangement (DF)

In a DF arrangement, the narrower ends face outward.

Advantages:

• Better tolerance to shaft misalignment
• Suitable for applications with alignment variation

Typical applications:

• Industrial machinery
• Agricultural equipment

Tandem Arrangement

Tandem installation places two bearings in the same direction.

Advantages:

• Increased axial load capacity in one direction

Applications:

• Heavy-duty equipment
• High thrust load systems

Preload Adjustment Considerations

Proper preload adjustment is critical for tapered roller bearing performance.

Correct preload helps achieve:

• Higher stiffness
• Reduced vibration
• Improved operating accuracy
• Longer service life

Excessive preload may cause:

• Increased friction
• Higher operating temperature
• Accelerated wear

Insufficient preload may cause:

• Excessive internal clearance
• Vibration
• Reduced positioning accuracy

Preload should always be adjusted according to:

• Manufacturer recommendations
• Application requirements
• Operating conditions

Tapered Roller Bearing Selection Guide

Before selecting a tapered roller bearing, engineers should evaluate the following factors:

1. Confirm Bearing Dimensions

Check:

✓ Shaft diameter
✓ Housing dimensions
✓ Bearing width
✓ Installation space

2. Evaluate Load Requirements

Consider:

Radial Load

Generated by:

• Equipment weight
• Gear forces
• Belt tension

Axial Load

Generated by:

• Thrust forces
• Helical gears
• Machine operation

3. Consider Operating Speed and Lubrication

Operating speed affects:

• Bearing temperature
• Lubrication requirements
• Service life

For higher-speed applications, evaluate:

• Lubricant type
• Operating temperature
• Bearing clearance

Proper lubrication reduces friction and improves reliability.

4. Evaluate Application Environment

Agricultural Machinery

Applications:

• Tractors
• Disc harrows
• Harvesting equipment

Operating conditions:

• Dust
• Moisture
• Vibration
• Shock loads

Important requirements:

• Reliable sealing
• Grease retention
• Contamination protection

Industrial Equipment

Applications:

• Gear reducers
• Conveyors
• Machine tools

Requirements:

• Stable performance
• Long operating life
• Consistent quality

Automotive Applications

Common uses:

• Wheel hubs
• Transmission systems
• Differential assemblies

Requirements:

• High reliability
• Accurate preload control
• Long service life

Tapered Roller Bearing Selection Checklist

Before ordering, confirm:

☑ Bearing model number

☑ Shaft and housing dimensions

☑ Radial load requirement

☑ Axial load requirement

☑ Contact angle suitability

☑ Single bearing or matched pair configuration

☑ Operating speed

☑ Lubrication method

☑ Temperature condition

☑ Contamination environment

Common Tapered Roller Bearing Selection Mistakes

Selecting Only by Bore Size

Bearing selection should not rely only on shaft diameter.

Always verify:

• Outside diameter
• Width
• Load rating
• Contact angle

Ignoring Axial Loads

Tapered roller bearings support both radial and axial loads.

Ignoring axial forces may lead to:

• Raceway damage
• Roller wear
• Reduced service life

Incorrect Pairing

Mixing unmatched cups and cones may affect:

• Internal clearance
• Contact conditions
• Bearing performance

Always use properly matched components.

Tapered Roller Bearing Replacement and Supply Support

When replacing an existing tapered roller bearing, engineers should compare:

• Bearing dimensions
• Load ratings
• OEM reference numbers
• Operating conditions

A professional bearing supplier can provide:

✓ Dimension verification

✓ OEM replacement matching

✓ Technical selection support

✓ Bulk supply solutions

✓ Export packaging support

For distributors, OEM manufacturers, and maintenance teams, reliable supply capability and technical support are essential for reducing purchasing risks.