NTN 4T-72188C/72487 47.625x123.825x36.512 - Tapered Roller Bearing

NTN 4T-72188C/72487 47.625x123.825x36.512 mm - Single Row Tapered Roller Bearing

NTN 4T-72188C/72487 is a single row tapered roller bearing with nominal dimensions of 47.625x123.825x36.512 mm, manufactured by NTN Corporation. It consists of the 72188C inner ring and roller assembly (cone) and the separate 72487 outer ring (cup). The 4T prefix identifies NTN's heat-treated bearing design. Its separable construction accommodates combined radial and axial loads, with axial load capacity in one direction.

Characteristics of NTN 4T-72188C/72487

The NTN 4T-72188C/72487 belongs to the inch-series tapered roller bearing family, with mounting dimensions also expressed in millimetres.

Its nominal bore diameter is 47.625 mm, outside diameter is 123.825 mm, and total assembled width is 36.512 mm.

The tapered geometry of the rollers and raceways allows the bearing to support combined radial and axial loads.

A single row tapered roller bearing supports axial loads in one direction. Where axial forces act in both directions, an appropriate opposing bearing arrangement is generally required.

Key characteristics:

• Manufacturer: NTN Corporation.

• Full designation: 4T-72188C/72487.

• Bearing type: Single row tapered roller bearing.

• Inch-series dimensional design.

• Separable construction with independent cone and cup assemblies.

• Tapered rollers operating between matching raceways.

• Designed for combined radial and axial loading.

• Axial load carrying capability in one direction.

• Bearing internal clearance or preload can be adjusted through the mounting arrangement.

• Requires appropriate lubrication and external sealing arrangements.

Technical Specifications

The listed dimensional, load rating and speed values correspond to catalogue information for the NTN 4T-72188C/72487 bearing combination.

Catalogue limiting speeds are not unconditional permissible operating speeds. Actual operating limits depend on loading, lubrication, temperature, mounting conditions and bearing arrangement.

What Does NTN 4T-72188C/72487 Mean?

The full designation identifies the NTN bearing execution and the specific combination of the inner and outer bearing components.

4T - NTN Bearing Execution

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

It does not indicate four rows of rollers or a four-piece bearing construction.

The 4T designation should be preserved when identifying or ordering the exact NTN product.

72188C - Inner Ring and Roller Assembly

72188C identifies the inner bearing assembly, commonly referred to as the cone assembly.

This assembly incorporates:

• Inner ring with a tapered raceway.

• Tapered rollers.

• Roller cage.

The letter C forms part of the cone designation 72188C.

It must not be interpreted as a C3 internal clearance suffix or omitted from the part number.

72487 - Outer Ring

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

The cup contains the tapered internal raceway that operates in conjunction with the rollers of the 72188C cone assembly.

Its nominal outside diameter is 123.825 mm, and its width is 25.400 mm.

/ - Cone and Cup Combination

The slash separates the cone designation from the cup designation.

The complete reference 4T-72188C/72487 identifies the specific bearing combination.

A different cup or cone should not be substituted solely because it belongs to a similar dimensional family.

Construction and Operating Principle

Inner Ring

The inner ring has a nominal bore diameter of 47.625 mm.

It is mounted on a suitably dimensioned shaft and contains the tapered inner raceway.

The mounting fit must be selected according to the direction and magnitude of the applied loads and the operating conditions.

Tapered Rollers

Tapered rollers transmit loads between the inner and outer raceways.

Their geometry enables the bearing to accommodate radial loads and axial loads acting in one direction.

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

This construction is particularly relevant in applications requiring substantial load carrying capability and controlled axial positioning.

Outer Ring

The 72487 outer ring has a nominal outside diameter of 123.825 mm.

It contains the tapered outer raceway and is mounted in a suitably prepared housing bore.

Separable Construction

The cone assembly and cup can be separated.

This simplifies certain mounting and inspection operations, but requires correct installation of both components.

The separable design also allows bearing clearance or preload to be adjusted through the arrangement of the shaft, housing and associated components.

Load Direction

The bearing is designed to carry radial loads and axial loads in one direction.

When a shaft must be located axially in both directions, two tapered roller bearings are often mounted in an opposing arrangement.

The appropriate arrangement depends on the load directions, bearing spacing, required stiffness and thermal operating conditions.

Bearing Dimensions - Difference Between B, C and T

For tapered roller bearings, the distinction between the widths of the individual rings and the complete bearing is essential.

The complete bearing dimensions are 47.625x123.825x36.512 mm, expressed as d x D x T.

The 32.791 mm dimension represents the inner ring width B, not the total assembled bearing width.

This distinction is important when identifying replacement bearings and checking the available installation space.

Dynamic and Static Load Ratings

Basic Dynamic Load Rating - Cr 171 kN

The basic dynamic load rating is used in bearing life calculations involving rotating operation under defined loading conditions.

It is not the maximum load that can be applied to the bearing under all operating conditions.

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

Basic Static Load Rating - C0r 188 kN

The basic static load rating is associated with a defined level of permanent deformation at the most heavily loaded rolling contact.

It is used when assessing bearing suitability under static or slowly rotating conditions.

The static load rating should not be treated as an unconditional maximum permissible operating load.

Calculation Factors e, Y2 and Y0

The factors e, Y2 and Y0 are used in calculations involving combined radial and axial loads.

For this bearing, the listed factors are:

• e: 0.74

• Y2: 0.81

• Y0: 0.45

These factors must be applied according to the appropriate NTN calculation method and loading conditions.

NTN 4T-72188C/72487 Compared with Other Variants

Several tapered roller bearing combinations use the 72487 outer ring while incorporating different cone assemblies.

The shared 72487 cup designation does not mean that the complete bearing assemblies are interchangeable.

Different cone assemblies have different bore diameters and may require different shaft dimensions and mounting conditions.

A 72188C cone should not be replaced with another cone without verifying the complete bearing specification.

Bearing Selection and Interchangeability

Before purchasing or replacing NTN 4T-72188C/72487, verify the technical requirements of the complete bearing arrangement.

Important selection criteria include:

1. Full NTN designation 4T-72188C/72487.

2. Manufacturer and bearing execution.

3. Bore diameter of 47.625 mm.

4. Outside diameter of 123.825 mm.

5. Total assembled width of 36.512 mm.

6. Cone designation 72188C.

7. Cup designation 72487.

8. Dynamic and static load ratings.

9. Direction and magnitude of axial loads.

10. Required operating clearance or preload.

11. Lubrication method and lubricant compatibility.

12. Operating speed.

13. Operating temperature.

14. Shaft and housing fits.

15. External sealing requirements.

Identical nominal dimensions do not automatically guarantee complete interchangeability between tapered roller bearings from different manufacturers.

Differences in internal geometry, load ratings, tolerances and mounting requirements must also be considered.

Typical Applications of Single Row Tapered Roller Bearings

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

Typical applications of this bearing type include:

• Industrial shaft bearing arrangements.

• Mechanical gearboxes and transmission assemblies.

• Rotating machinery requiring axial shaft location.

• Bearing systems with adjustable operating clearance.

• Opposed tapered roller bearing arrangements.

These examples describe general applications of single row tapered roller bearings.

They do not establish confirmed OEM compatibility between NTN 4T-72188C/72487 and any particular vehicle, gearbox or industrial machine.

Installation and Operating 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 appropriate 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, the bearing arrangement must be adjusted to achieve the required operating clearance or preload.

Correct adjustment is particularly important for tapered roller bearings because excessive preload may increase friction and operating temperature, while excessive clearance can reduce running accuracy and stiffness.

The bearing requires suitable oil or grease lubrication according to the application.

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-72188C/72487

• 4T-72188C/72487 NTN

• NTN 72188C/72487

• 72188C/72487

• 4T 72188C 72487 NTN

• NTN 4T-72188C

• NTN 4T-72487

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

Alternative writing formats should not be treated as separate verified OEM part numbers.

FAQ - NTN 4T-72188C/72487

1. What are the dimensions of NTN 4T-72188C/72487?

The bearing has a bore diameter of 47.625 mm, outside diameter of 123.825 mm and total assembled width of 36.512 mm. Its complete dimensions are 47.625x123.825x36.512 mm.

2. Is NTN 4T-72188C/72487 a tapered roller bearing?

Yes. It is a single row tapered roller bearing with a separable cone and cup construction.

3. What does the 4T prefix mean?

4T identifies an NTN bearing execution associated with the manufacturer's heat treatment technology.

4. What do 72188C and 72487 identify?

72188C identifies the inner ring and tapered roller assembly, while 72487 identifies the separate outer ring.

5. Is the bearing width 32.791 mm?

No. The 32.791 mm dimension is the inner ring width B. The total assembled bearing width T is 36.512 mm.

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

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

7. Is NTN 4T-72188C/72487 supplied with integrated seals?

The bearing has a separable, open tapered roller construction without integral contact seals. External sealing arrangements are required where protection against contamination and lubricant loss is necessary.

8. Can another bearing with the same dimensions replace NTN 4T-72188C/72487?

Not without technical verification. Internal construction, load ratings, dimensional accuracy, lubrication requirements and mounting conditions must be checked. Identical nominal dimensions do not guarantee full interchangeability.

NTN 4T-72188C/72487 - Key Technical Information

NTN 4T-72188C/72487 is a single row tapered roller bearing with dimensions of 47.625x123.825x36.512 mm. It consists of the 72188C cone assembly and 72487 cup. The 4T prefix identifies an NTN bearing execution. Its separable construction allows clearance or preload adjustment during installation and 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 maintenance departments, industrial manufacturers and international B2B customers, with worldwide shipping options.