NTN 4T-72212C/72487 53.975x123.825x36.512 - Tapered Roller Bearing

NTN 4T-72212C/72487 53.975x123.825x36.512 mm - Single Row Tapered Roller Bearing

NTN 4T-72212C/72487 is a single row tapered roller bearing from the inch-dimensional series, with nominal dimensions of 53.975x123.825x36.512 mm. Manufactured by NTN, it consists of the 72212C inner ring and tapered roller assembly (cone) and the separate 72487 outer ring (cup). The 4T prefix identifies an NTN bearing execution associated with heat treatment technology. Its separable construction supports combined radial and one-directional axial loads.

Characteristics of NTN 4T-72212C/72487

The NTN 4T-72212C/72487 is a separable tapered roller bearing designed for applications involving combined radial and axial loading.

The inner ring, tapered rollers and cage form a separate assembly that operates together with the matching outer ring.

The tapered geometry of the rollers and raceways enables the bearing to accommodate radial forces and axial forces acting in one direction.

Key characteristics:

• Manufacturer: NTN Corporation.

• Full designation: 4T-72212C/72487.

• Bearing type: Single row tapered roller bearing.

• Inch-series dimensional design.

• Bore diameter: 53.975 mm.

• Outside diameter: 123.825 mm.

• Total assembled width: 36.512 mm.

• Cone assembly: 72212C.

• Cup: 72487.

• Separable inner and outer ring construction.

• Tapered rollers with a pressed steel cage.

• Adjustable bearing clearance or preload through the mounting arrangement.

• Open bearing design requiring appropriate lubrication and external protection against contamination.

The dimensions 53.97x123.82x36.51 mm are rounded values. For technical identification, dimensional verification and mounting calculations, use the nominal dimensions 53.975x123.825x36.512 mm.

Technical Specifications

The listed technical values correspond to the NTN-SNR catalogue specification for the 4T-72212C/72487 bearing combination.

Catalogue speed limits must be evaluated together with the actual load, lubrication conditions, preload, operating temperature and heat dissipation.

What Does NTN 4T-72212C/72487 Mean?

The complete designation identifies the NTN bearing execution and the specific combination of the cone and cup.

4T - NTN Bearing Execution

The 4T prefix identifies a specific NTN tapered roller bearing execution associated with the manufacturer's heat treatment technology.

It does not indicate four rows of tapered rollers or a particular internal clearance class.

The prefix is part of the manufacturer's product identification and should be retained when ordering the exact bearing.

72212C - Inner Ring and Roller Assembly

72212C identifies the inner bearing assembly, commonly referred to as the cone assembly.

It consists of:

• Inner ring with a tapered raceway.

• Tapered rollers.

• Roller cage.

The letter C is an integral part of the 72212C designation.

It must not be interpreted as a C3 internal clearance suffix.

72487 - Outer Ring

72487 identifies the outer bearing ring, commonly referred to as the cup.

The cup contains the tapered internal raceway that operates together with the rollers of the 72212C cone assembly.

Its nominal outside diameter is 123.825 mm.

/ - Cone and Cup Combination

The slash separates the cone designation from the cup designation.

The complete reference 4T-72212C/72487 identifies the specific bearing assembly.

A different cone or cup must not be substituted without verifying the complete bearing specification.

Construction and Operating Principle

Inner Ring

The inner ring has a nominal bore diameter of 53.975 mm and a tapered raceway.

It is designed to be mounted on a suitably dimensioned shaft.

Correct shaft fits are essential for reliable bearing operation.

Tapered Rollers

The rolling elements have a tapered geometry and operate between matching inner and outer raceways.

This arrangement allows the bearing to support combined radial and axial loads.

Unlike deep groove ball bearings, tapered roller bearings use rolling elements that establish line contact with the raceways.

This construction is particularly relevant in applications involving substantial loads and controlled axial positioning.

Pressed Steel Cage

The bearing incorporates a pressed steel cage.

The cage maintains the distribution of the tapered rollers and guides their movement during rotation.

Outer Ring

The 72487 outer ring is a separate component with a nominal outside diameter of 123.825 mm.

It is mounted in a suitably prepared housing bore.

Separable Construction

The cone assembly and cup can be separated during installation.

This allows the bearing to be mounted and adjusted as part of the complete shaft and housing arrangement.

Operating clearance or preload is established through the bearing mounting system.

The correct adjustment must be determined according to the requirements of the application.

Load Ratings and Operating Parameters

Basic Dynamic Load Rating - C 171 kN

The basic dynamic load rating is used when calculating bearing fatigue life under rotating operating conditions.

It is not an unconditional maximum permissible operating load.

Actual bearing life depends on the equivalent dynamic load, lubrication, contamination, operating temperature and other application factors.

Basic Static Load Rating - C0 188 kN

The basic static load rating is used to assess bearing suitability under static or very slowly rotating conditions.

It relates to a defined level of permanent deformation at the most heavily loaded rolling contact.

It should not be treated as an unrestricted maximum load.

Fatigue Load Limit - Cu 22.9 kN

The fatigue load limit is used in bearing life calculation methods that account for fatigue-related operating conditions.

It does not represent the maximum permissible working load.

Limiting Speed

The catalogue values are:

• Grease lubrication: 2,900 rpm.

• Oil lubrication: 3,900 rpm.

Actual permissible operating speed depends on applied loads, bearing preload, lubricant properties, temperature and the ability of the bearing arrangement to dissipate heat.

Calculation Factors

The catalogue calculation factors are:

• e: 0.74.

• Y0: 0.45.

• Y2: 0.81.

These values are used in the appropriate NTN methods for calculating equivalent bearing loads.

NTN 4T-72212C/72487 Compared with 4T-72188C/72487

Both bearing combinations use the 72487 outer ring but have different cone assemblies.

The principal dimensional difference is the bore diameter.

NTN 4T-72212C/72487 is not a direct replacement for NTN 4T-72188C/72487, because the bearings require different shaft mounting diameters.

The use of the same cup does not establish interchangeability between the complete bearing assemblies.

Bearing Selection and Interchangeability

Before purchasing or replacing NTN 4T-72212C/72487, verify the requirements of the complete bearing arrangement.

Important selection criteria include:

1. Full NTN designation 4T-72212C/72487.

2. Shaft diameter of 53.975 mm.

3. Housing bore diameter of 123.825 mm.

4. Total bearing width of 36.512 mm.

5. Compatibility of the 72212C cone and 72487 cup.

6. Required radial and axial load ratings.

7. Operating clearance or preload.

8. Shaft and housing fits.

9. Operating speed and temperature.

10. Lubrication method and sealing arrangement.

Identical nominal dimensions do not always guarantee complete interchangeability between bearings from different manufacturers.

Internal geometry, load ratings, dimensional tolerances and mounting requirements must also be considered.

Typical Applications of Tapered Roller Bearings

Single row tapered roller bearings are used in mechanical systems where radial and axial forces occur simultaneously.

Typical applications of this bearing type include:

• Industrial shaft bearing arrangements.

• Mechanical gearboxes.

• Rotating machinery requiring axial shaft location.

• Bearing systems with adjustable axial clearance.

• Opposed tapered roller bearing arrangements.

• Industrial power transmission equipment.

These are general applications of single row tapered roller bearings and do not establish confirmed OEM compatibility for the exact NTN 4T-72212C/72487 designation.

Installation and Maintenance Recommendations

Before installation, clean the shaft, housing and bearing mounting surfaces.

Inspect the components for contamination, damage and dimensional irregularities.

The inner and outer rings must be mounted using the specified fits.

When an interference fit is required, mounting force should be applied directly to the ring being installed.

Never transmit mounting forces through the tapered rollers, as this may damage the raceways.

After installation, adjust the bearing arrangement to obtain the required operating clearance or preload.

Excessive preload may increase friction and operating temperature, while excessive clearance can reduce running accuracy and shaft stiffness.

The bearing has an open construction and requires suitable lubrication and protection against contamination.

During operation, monitor temperature, vibration, noise and lubricant condition.

Store unused bearings in clean, dry conditions, preferably in their original protective packaging.

Alternative Designations and Search References

The product may be identified using the following formats:

• NTN 4T-72212C/72487

• 4T-72212C/72487 NTN

• NTN 72212C/72487

• 72212C/72487

• 4T 72212C 72487 NTN

• NTN 4T-72212C

• NTN 4T-72487

The last two references identify the cone assembly and cup respectively, rather than independently identifying the complete assembled bearing.

These alternative formats should not be treated as separate confirmed OEM part numbers.

FAQ - NTN 4T-72212C/72487

1. What are the dimensions of NTN 4T-72212C/72487?

The bearing has a bore diameter of 53.975 mm, outside diameter of 123.825 mm and total assembled width of 36.512 mm. Its complete dimensions are 53.975x123.825x36.512 mm.

2. Is NTN 4T-72212C/72487 a single row bearing?

Yes. It is a single row tapered roller bearing with a separable outer ring.

3. What does 72212C mean?

72212C identifies the inner ring and tapered roller assembly, commonly called the cone.

4. What does 72487 mean?

72487 identifies the outer ring, or cup, that operates with the 72212C cone assembly.

5. Are NTN 4T-72212C/72487 and 4T-72188C/72487 interchangeable?

Not as direct replacements. They have different bore diameters: 53.975 mm and 47.625 mm respectively.

6. Does the bearing have integrated seals?

No. It is an open tapered roller bearing. External sealing arrangements are required where protection against contamination and lubricant loss is necessary.

7. Can NTN 4T-72212C/72487 operate with oil lubrication?

Yes. It can be used in appropriately designed oil-lubricated or grease-lubricated bearing arrangements, provided the operating conditions meet the manufacturer's requirements.

8. Can this bearing support axial loads in both directions?

A single tapered roller bearing supports axial loads in one direction. Where axial forces act in both directions, an appropriately designed bearing arrangement, often using two opposing bearings, is required.

NTN 4T-72212C/72487 - Key Technical Information

NTN 4T-72212C/72487 is a single row tapered roller bearing with dimensions of 53.975x123.825x36.512 mm. It consists of the 72212C cone and 72487 cup, with a pressed steel cage and separable construction. Its basic dynamic load rating is 171 kN and static load rating is 188 kN. It supports combined radial and one-directional axial loads.

The product is available through simmering.pl, a specialist supplier of rolling bearings and industrial mechanical components.

With warehouse operations in Lublin, Poland, simmering.pl supplies industrial maintenance departments, machine manufacturers and international B2B customers, with worldwide shipping options.