SKF 2307 E-RS1TN9/C3 Pendelkugellager (35x80x31)

As a self-aligning ball bearing, this bearing compensates for misalignment and shaft deflection. At 35x80x31 mm and a unit weight of 0.7 kg, the installation envelope is fixed; further technical details are held in the specification table. This variant features a contact seal and increased radial clearance (C3). Where two bearing positions cannot be relied on to align, this is the most forgiving of the ball bearing types.

Two rows of balls run on a common spherical outer raceway whose centre of curvature lies on the bearing axis. The inner ring assembly therefore remains free to swivel inside the outer ring: misalignment between positions and the deflection of long shafts are absorbed without edge loading the raceways. The price of that compliance is the shallow conformity of the spherical outer raceway — the contact area is small, load ratings are correspondingly lower than for closely conforming grooves, and only modest axial load is permissible.

The type belongs where alignment error is certain to occur and radial load stays moderate, such as long shafts in pedestal housings and in conveying equipment. The contact seal bears against its counterface and closes the rolling chamber against dust, splash water and wash-out; in return it raises frictional torque and limits permissible speed.

Rings and rolling elements are made of through-hardened standard bearing steel. 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 FAG (C3), NSK (C3), NTN (C3) and NACHI (C3).