Spherical roller bearing NTN 21317

NTN 21317 is a spherical roller bearing reference, within Bearings. Request a quote for 21317 via WhatsApp or email with the quantity you need; we respond promptly with lead time 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 numeric 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. For example, 239/500 has a 500 mm bore, 239/530 has a 530 mm bore, and so on. In this series, the numeric suffix after the slash directly indicates the size in millimeters, with no 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 shields. Mounting must be carried out with suitable tools to avoid damaging the rollers or raceways. Lubrication must be the one specified by the manufacturer, and it is important to check the initial alignment to take advantage of the bearing's self-aligning capability.

As for equivalents, 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 any doubts, ask us with the original part number.

If you need an NTN spherical roller bearing, write to us via WhatsApp with the part number 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. With more than 80 years in the market, since 1945, we support Argentine industry with quality products and personalized service.

This description provides guidance on the product type. Check the configuration and dimensions of this reference.