NTN 21311 spherical roller bearing

NTN 21311 is a reference of spherical roller bearing, within Bearings. Request a quote for 21311 via WhatsApp or email with the quantity you need; we respond promptly with the quote and equivalents.

The NTN spherical roller bearing is a component designed to withstand high radial loads and axial loads in both directions, even when the shaft is misaligned. Its design with two rows of rollers and a spherical raceway allows the outer ring to oscillate, compensating for mounting errors or shaft deflection. It is used in industrial applications where perfect alignment is not guaranteed, such as conveyors, mills, pumps and mining equipment. MR Accesorios Industriales sells the NTN brand in Buenos Aires, Argentina.

The 239 series is identified by its numerical designation: the first digits indicate the bearing type (239 corresponds to spherical roller bearings with a particularly thin section), and the following two or three digits correspond to the bore diameter, according to the code. For example, 239/500 has a 500 mm bore, 239/530 has a 530 mm bore, and so on. In this series, the numerical suffix after the slash directly indicates the measurement in millimeters, without the need to multiply. This nomenclature allows you to quickly identify the required size.

These bearings are used in industries such as cement, mining, steel and material handling. In Argentina, they are common in ball mills, crushers, belt conveyors, high-flow centrifugal pumps and lifting equipment. Their ability to withstand combined loads and misalignment makes them suitable for assemblies where the shaft may deflect or where the structure is not completely rigid. They are also used in paper machines and large industrial fans.

To correctly select a spherical roller bearing, take into account the radial and axial load it must withstand, the rotation speed and the environmental conditions. It is essential to verify the sealing: if the equipment operates in dusty or humid environments, it is advisable to choose variants with seals or protective plates. Mounting must be carried out with suitable tools to avoid damaging the rollers or raceways. Lubrication must be the one indicated by the manufacturer, and it is important to check the initial alignment to take advantage of the bearing's self-aligning capability.

Regarding equivalences, NTN spherical roller bearings can be interchanged with those of other brands that follow the same international designation. For example, an NTN 239/500 is equivalent to a 239/500 from SKF, FAG or NSK, as long as the tolerances and cage type are maintained. However, it is advisable to verify the technical specifications of each manufacturer, since there may be differences in load capacity or materials. If you have doubts, ask us with the original part number.

If you need an NTN spherical roller bearing, write to us via WhatsApp with the code or size you are looking for. At MR Accesorios Industriales we will quote it for you promptly. We can also advise you on the most suitable variant for your application. Since 1945, we support Argentine industry with quality products and personalized attention.