NSK NA5912 needle roller bearing

NSK NA5912 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 NA5912 and any equivalents.

When a machine design leaves little room between shaft and housing but the radial load is still demanding, the NSK NA series needle roller bearing is a common answer. It combines a small cross-section with a steel cage that guides the needles, so the bearing runs with high load capacity and rigidity. Machine tools, pumps, compressors and transmission equipment are typical homes for this series, and it also appears in automotive gearboxes and steering systems. MR Industrial Accessories LLC supplies the NSK line and will help you match the right size to your application.

Reading an NA code takes a moment at first. The letters NA tell you this is a needle roller bearing with an inner ring. The digits after the slash are not a single measurement; they encode the bore diameter and the dimension series together. So NA49/22, NA49/28 and NA49/32 belong to the NA49 family with different shaft sizes, NA59/22, NA59/28 and NA59/32 sit in the NA59 family, and NA69/22 and NA69/28 make up the NA69 group. Any suffix at the end points to a sealing, clearance or tolerance variant. If a suffix on your code is unfamiliar, send the full reference and we will quote it.

These bearings turn up in gearboxes, textile machinery, packaging lines, vacuum pumps, air compressors and machine tools, as well as in automotive gearboxes and steering systems and in agricultural and road equipment. The reason is straightforward: they carry high radial loads in a footprint too small for a ball bearing. Where a compact design is the priority, the NA series often fits where nothing else will.

Selection comes down to shaft diameter, radial load and operating speed. Check that the housing has the right hardness and surface finish, and that the shaft meets the recommended tolerance. Press fitting or controlled heating is the way to mount them; never strike the needles directly. Grease or oil both work as lubrication depending on speed and environment, and sealed variants are the better choice in dirty conditions. Shaft-to-housing alignment matters, since misalignment puts lateral stress on the bearing.

NA series bearings from different manufacturers can be swapped when the main dimensions and design type line up. Compare bore diameter, outer diameter, width and load capacity before substituting. The NA48, NA49, NA59 and NA69 series follow dimensional standards that make equivalence easier, though other series exist within this type. Send us another brand's code and we will point you to the equivalent NSK reference for quoting.

MR Industrial Accessories LLC supplies NSK bearings and can help you locate the needle roller bearing your application needs. Send the code or your measurements by WhatsApp or email and the team will reply promptly. Looking for a sealed version, special clearance or a particular size? Write with the exact model and we will suggest equivalents and help you choose.