ZEN 61804-2Z-C2 Kugellager (20x32x7)

The dynamic load rating of 4.03 kN characterises this bearing. The static load rating is 2.32 kN. The limiting speed is 28000 rpm. This variant features reduced radial clearance (C2). The deep groove ball bearing is the most widely built rolling bearing type, and the reason is how little it asks: it carries radial load, supports moderate axial load in both directions, and demands little of the surrounding design.

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 shields on both sides run without contact: they hold back coarse contamination and keep the lubricant in, adding no frictional torque — but they do not protect against splash water or fine dust. Rings and rolling elements are made of through-hardened standard bearing steel. The reduced radial clearance raises guiding accuracy and is intended for positions that run closely guided and are thermally lightly loaded.

Reduced radial clearance C2 — Dimensional/form-fit equivalent — verify suffix-level details for critical applications. Matching suffixes are also listed by SKF (C2), FAG (C2), NSK (C2), NTN (C2) and NACHI (C2).