NTN RNA4917R needle roller bearing

NTN RNA4917R belongs to needle roller bearing, part of our Bearings range. Tell us how many you need by WhatsApp or email and we'll get back to you promptly with a quote for RNA4917R and any equivalents.

When radial space is tight, the NTN RNA series needle roller bearing provides a compact solution. It has no inner ring, so the shaft itself serves as the raceway. This design saves room and weight, making it suitable for gearboxes, pumps, compressors, and other continuous-duty equipment. MR Industrial Accessories supplies this NTN line to customers across the United States and Latin America.

Reading the RNA code helps you specify the right bearing. The letters RNA mean a needle roller bearing without an inner ring. The first digits give the dimension series: 49 or 69. The number after the slash is the shaft diameter in millimeters. The final R denotes a stamped steel cage with guided needles. For instance, RNA49/22R is from the 49 series for a 22 mm shaft, and RNA69/32R is from the 69 series for the same shaft diameter but with a wider section. The 49 series has the smaller cross-section; the 69 series handles higher radial loads.

These bearings appear in food processing, cement, steel, and metalworking plants. You will find them in gearboxes, water and oil pumps, air compressors, machine tools, conveyors, and bottling lines. Their low radial height makes them a practical replacement for bushings on shafts where space is limited, while maintaining rotational accuracy. Automotive and agricultural machinery also use them where wear resistance and radial load capacity are important.

Correct selection depends on the shaft. The raceway is ground directly on the shaft, so the surface must have adequate hardness and a fine finish. Check alignment between shaft and housing, as these bearings do not tolerate misalignment well. Lubrication can be grease or oil, chosen according to speed and temperature. In dirty environments, consider external seals or sealed variants. Internal radial clearance is set based on mounting and load conditions.

For equivalents, needle roller bearings without an inner ring are identified by their designation and dimensions. Other brands such as SKF, FAG, NSK, or INA use their own nomenclature, but interchangeability is determined by shaft diameter, outer diameter, and width. If you have a code from another brand or an unidentified part, send us the data and we will provide the equivalent NTN reference. We work with the catalogs of the manufacturers we represent.

To request a quote for an NTN RNA series needle roller bearing, contact us via WhatsApp with the complete code or the shaft and housing dimensions. We reply promptly with the exact reference and a compatible alternative if needed. We can also advise on mounting and lubrication so the part performs as expected.