How to Choose NTN Bearings by Application: Load, Speed, Environment and Mounting

The first step in choosing an NTN bearing is to understand the type of load it will support. If the load is mainly radial (perpendicular to the shaft), deep groove ball bearings or cylindrical roller bearings are usually suitable. If there is axial load (along the shaft), angular contact or tapered roller bearings are needed, as they can support combined loads.

In applications with very high radial loads, cylindrical roller bearings such as NU413, NU314 or NU215 are a robust option. These bearings have high radial load capacity and allow axial displacement in one direction, making them ideal for transmission shafts and electric motors.

For combined loads (radial and axial), tapered rollers are the classic choice. For example, 32924, 32926 and 32910 are NTN tapered roller codes used in gearboxes, vehicle wheels and industrial equipment. Their design allows them to support large loads in both directions.

When the application requires high rotational speeds, attention must be paid to the bearing type and its precision. Angular contact bearings are excellent for high speeds and combined loads, especially in machine tool spindles, pumps and compressors.

In the NTN catalog, codes such as 7911, 7317 and 7218 correspond to single-row angular contact bearings. These bearings are generally mounted in pairs, face-to-face or in tandem, to support axial loads in both directions and achieve high rigidity.

To choose the right one, it is key to know the rotational speed, the magnitude of the axial load and the direction in which it acts. With that data, we help you define the bearing and mounting arrangement.

In applications where mounting and dismounting must be quick and perfect alignment is not required, Y-bearings (also called inserts) are a practical solution. These bearings have a spherical outer ring that fits into a housing with a concave seat, allowing compensation for shaft misalignment.

In the NTN catalog you will find Y-bearings such as AR202, AS208 and AR201. They are used in agricultural machinery, conveyors, fans and food processing equipment.

When choosing a Y-bearing, consider the shaft diameter, the housing type (pillow block, flange, take-up) and the shaft fixing method (set screws, eccentric ring or adapter sleeve). Versions with seals and lifetime lubrication reduce maintenance.

Cylindrical roller bearings are ideal for supporting very high radial loads in confined spaces. Their design allows high load capacity and great rigidity, so they are used in gearboxes, electric motors, rolling mills and construction equipment.

In the NTN catalog, codes NU413, NU314 and NU215 correspond to single-row cylindrical roller bearings. This design allows axial displacement of the shaft relative to the housing, which is useful when the shaft expands with temperature.

When selecting a cylindrical roller bearing, it is important to verify the dynamic and static load capacity, as well as the limiting speed. If there are also occasional axial loads, it is advisable to choose a design with flanges that support them: consult us and we will indicate the appropriate variant.

When the shaft may suffer significant misalignment or deflection, spherical roller bearings are the best option. These bearings have two rows of rollers and a spherical raceway on the outer ring, allowing them to self-align and compensate for misalignment.

In the NTN catalog there are spherical roller bearings such as 21314, 21317 and 21318. These bearings are robust and support very high radial loads, as well as moderate axial loads in both directions. They are used in industrial fans, mills, heavy machinery and mining equipment.

When choosing a spherical roller bearing, consider the shaft diameter, radial and axial load, and rotational speed. It is also important to check whether the bearing requires a tapered bore (suffix K) for mounting on an adapter sleeve.

The working environment directly influences bearing selection. In environments with dust, moisture or contaminants, bearings with seals or shields that protect the interior are recommended. Suffixes 2RS (rubber seal on both sides) and 2Z (metal shield on both sides) are common in deep groove ball bearings and some Y-bearings.

For applications with high temperatures or heavy loads, a larger than normal internal clearance may be required, indicated by suffix C3. This clearance allows thermal expansion without the bearing locking up. It is important to consult MR's technical team to validate the exact designation according to the NTN catalog.

In corrosive environments or with frequent washdowns, stainless steel bearings or special seals may be necessary. Tell us the working conditions and we will advise you on the best option for your application.

The mounting method also influences bearing selection. If mounting is frequent or access is difficult, Y-bearings with eccentric locking or adapter sleeves can simplify the task. For long shafts or with poor accessibility, bearings with tapered bore (suffix K) mounted on adapter sleeves are a good option.

Preventive maintenance is essential to prolong bearing life. Proper lubrication, temperature and vibration control, and periodic seal inspection help prevent premature failures. As an official NTN distributor, MR advises you on selection and mounting.

When selecting a bearing, it is essential to know the exact dimensions (inner diameter, outer diameter and width), load and speed. If you have the code from another brand, we will indicate the NTN equivalent. Send us the code, measurement or a photo via WhatsApp or email and we will quote you promptly.