Needle roller bearings

The needle roller bearing is a type of bearing with cylindrical rollers of small diameter and great length, which allows it to support heavy loads in a very reduced radial space. It is selected when the design requires a thin profile and there is no room for a conventional ball or roller bearing. At MR Accesorios Industriales we list 451 SKF references in this category, all of which can be quoted.

The series in the catalog are identified by abbreviations that indicate their construction. HK designates bearings with cage, machined outer ring, and no inner ring; NK are similar but with standardized dimensions; NA and RNA correspond to bearings with an inner ring or without one, respectively, and are used when the shaft is not hardened. NKI and NKIS combine machined inner and outer rings, with or without a rib. NKX and NKXR are needle units with a thrust washer, for combined loads. PNA and RPNA are aligning needle roller bearings for applications where alignment is required. NAO and NKIB are double-row variants or with a split inner ring. Understanding these differences is key to selecting the correct replacement.

Typical applications include transmissions, pumps, power tools, production machinery, compressors, and automation equipment. They are also used in gearboxes, electric motors, and linear guidance systems where space is critical. As high-capacity bearings in a small volume, they are common in the automotive industry and agricultural machinery.

To request a quote for a needle roller bearing we need the complete part number (for example, HK 1612, NA 4901, NK 10/16 TN, NKI 70/25, NKIS 17, NKX 60 Z, PNA 25/47, RNA 49/22, NKIB 59/22, NAO 40X55X17, NKXR 20, RPNA 30/47) or, failing that, the main dimensions: bore diameter, outside diameter, and width. If you do not have the part number, we can look up the equivalence with other brands. It is also helpful to indicate the application and load conditions to guide you in the selection.

At MR Accesorios Industriales SRL, with more than 80 years in Buenos Aires, Argentina, we sell SKF bearings and manufacture housings, chains, and pulleys under the EMMAR brand. To receive a quote, write to us via WhatsApp or email with the part number or dimensions of the needle roller bearing you need.