NTN RNA4934 needle roller bearing

NTN RNA4934 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 RNA4934 and any equivalents.

Needle roller bearings in the NTN RNA series are single-row units that come without an inner ring. The shaft itself, once it has been hardened and ground, serves as the raceway, so the surrounding assembly can be smaller and lighter. Where the outer diameter is limited but radial loads are still significant, these bearings are a practical choice. They appear in transmissions, pumps, compressors and textile machinery.

Reading the code helps you narrow down the right unit. The letters RNA tell you there is no inner ring. What follows identifies the series and size: RNA59/22 and RNA59/32 sit in the RNA59 series, RNA497 and RNA499 in the RNA49 series, and RNA4822, RNA4824, RNA4826 and RNA4828 in the RNA48 series. In the RNA59 group, the digits after the slash give the shaft diameter in millimeters. For RNA48 and RNA49, the numeric block follows the standard size designation. Section profile and load capacity differ from one series to the next.

Typical equipment includes gearboxes, water and oil pumps, air compressors, textile machines, packaging lines, cranes and agricultural machinery. The ability to carry radial load in a confined envelope also makes these bearings common in automotive work, metalworking plants, and food and beverage operations.

Selection starts with radial load, speed and the space you have. The shaft must be hardened and ground, with a minimum hardness of 58 HRC and a roughness suited to raceway service. Grease or oil lubrication both work. Shaft-to-housing alignment needs to be precise to avoid extra stresses. Sealing depends on how the assembly is designed, and external seals are often needed. Check internal clearance along with shaft and housing tolerances.

NTN needle roller bearings can be interchanged with other brands that use the same dimensional standards, such as SKF, FAG, NSK or Timken, when series and size code match. For a replacement, compare shaft diameter, outer diameter, width, and dynamic and static load ratings. If you only have another brand's code, send it over and we can help you find the equivalent. Interchange is not always direct across series, so it pays to check with your application data.