NKE MJ4-C3 Kugellager (101,6x215,9x44,45)

The principal dimensions are 101.6x215.9x44.45 mm at a weight of 6.71 kg; the further technical details are listed in the specification table. This variant features increased radial clearance (C3). 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 open version leaves sealing, initial filling and relubrication to the surrounding design, while keeping the rolling chamber accessible for a directed supply of lubricant. 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.

Increased radial clearance C3 — Dimensional/form-fit equivalent — verify suffix-level details for critical applications. Matching suffixes are also listed by SKF (HC5C3, HC5C3WT, C3), FAG (C3), NSK (C3), NTN (C3) and NACHI (C3).