NTN 6214 ZC4 Kugellager (70x125x24)

The mounting dimensions are 70x125x24 mm and the weight is 1.08 kg; technical details beyond these are shown in the specification table. This variant features greatly increased radial clearance (C4). Point contact between ball and raceway keeps frictional torque low, which is why this type runs faster and cooler than any other rolling bearing.

The deep, closely conforming raceway grooves in the inner and outer ring capture the balls positively, so the bearing takes radial load and moderate axial load in both directions without a second bearing position to oppose it. Because the ball touches the raceway at a point, friction and heat stay low — the precondition for high speeds and for grease-for-life designs.

The limits follow from that same geometry: the small contact area caps load capacity against a roller bearing of equal size, and the bearing tolerates misalignment within narrow limits only, since angular error transfers straight into the raceway grooves. Seats in shaft and housing must therefore be aligned and geometrically accurate; where shaft deflection is expected, a self-aligning type belongs in that position.

The single shield runs without contact and holds back coarse contamination on its side; the open opposite side is left to the surrounding design, which seals it there or supplies the lubricant. Rings and rolling elements are made of through-hardened standard bearing steel. The strongly increased radial clearance is intended for pronounced temperature differences between the rings or for very tight fits; without those conditions the bearing runs with unnecessary play.