KLK series bearings utilize a single-row four-point contact ball arrangement, with each ball contacting the raceways at four distinct points. This geometry enables the bearing to simultaneously support axial loads in both directions, radial loads, and tilting moments within a single, compact row of rolling elements.

The defining characteristic of the KLK series is its balanced design—offering a practical combination of load capacity and compact dimensions. The bearings are manufactured with a medium ring cross-section that provides sufficient structural strength for most towing applications while maintaining a relatively low profile. This versatility makes the KLK series suitable for a wide range of trailer types and load conditions.

The bearings are equipped with integral mounting holes on both the inner and outer rings, enabling direct bolted attachment to the trailer chassis and the towing structure. This simplifies installation and eliminates the need for additional adaptor plates. The bearings are typically supplied with seals on both sides to prevent contamination from dirt, water, and debris commonly encountered in outdoor towing environments.