NACHI NJ211 EGC3 Zylinderrollenlager (55x100x21)

As a cylindrical roller bearing, this bearing carries high radial loads with limited axial capacity. For this NACHI bearing, 55x100x21 mm and a weight of 0.68 kg apply; the specification table holds the further technical particulars. This variant features increased radial clearance (C3). Line contact between roller and raceway spreads load along a line instead of a point, which is where the high radial capacity comes from.

Cylindrical rollers run between inner and outer ring on line contact, which yields markedly higher radial capacity than point contact at the same size. Axial guidance comes not from the raceway shape but from ribs: which rings carry ribs decides whether the bearing locates the shaft axially or, as a floating position, absorbs its thermal growth — in ribless versions the roller set simply shifts along the raceway without inducing constraint forces.

That is exactly what makes the type the usual choice for the second position of a long shaft that heats up. It tolerates misalignment poorly: angular error travels straight to the roller edge, so seats must be aligned, accurate in form and stiff enough. The slightly increased radial clearance provides reserve for tighter fits and for temperature differences between inner and outer ring, as they occur on shafts that run warm.