As a core feature, the QNA series adopts a classic four-point contact ball design. Precision steel balls form four stable contact points with induction-hardened raceways, allowing the slewing bearing to withstand combined axial loads, radial loads and overturning moments simultaneously. Unlike conventional single-direction bearings that only support limited load types, this structural optimization delivers higher rigidity, better stress dispersion and stronger operational stability under cyclic, intermittent and complex working conditions. It effectively reduces rotational shake, friction loss and mechanical fatigue during long-term continuous operation.

Featuring one-piece internal gear teeth machined on the outer ring, the QNA internal gear slewing bearing enables direct meshing with drive pinions for efficient power transmission. This integrated gear structure eliminates redundant intermediate transmission parts, greatly simplifies equipment assembly structure, minimizes installation errors and saves overall machine layout space. All gear teeth are precision-machined and heat-treated with strict tolerance control, ensuring smooth meshing, low running noise and superior wear resistance in frequent start-stop and continuous rotation scenarios.