KLK HE 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 HE series is its heavy-duty construction combined with a low-profile design. The bearings are manufactured with a robust ring cross-section to withstand the demanding loads encountered in towing applications, including shock loads from uneven terrain and dynamic forces during turning and maneuvering. The rings feature a flat, wide surface profile that provides excellent mounting stability, while the overall height of the bearing is minimized to maintain a low center of gravity for the towing equipment.

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 heavy-duty seals on both sides to prevent contamination from dirt, water, and debris commonly encountered in outdoor towing environments.