NK 1212

The NK 1212 is a machined‑ring needle roller bearing without inner ring. Its design assumes that the shaft itself will serve as the inner raceway (i.e. the shaft must be hardened/ground). This makes the NK 1212 very compact, low‑profile and suitable for light weight or space‑constrained applications where shaft treatment is already handled, such as small motors or compact gear assemblies.

NA 4900

The NA 4900 is the smallest standard machined‑ring needle roller bearing with inner ring in the “NA 49..” series, designed for very compact, low‑cross‑section radial load applications. Its small dimensions make it suitable for precision assemblies, small motors or pumps, and wherever minimal space and light loads are involved. Despite its compact size, it retains the typical advantages of needle roller bearings: high radial load capability relative to its size, smooth rotation, and reliable performance with proper lubrication.