Type 90 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 Type 90 series is its low-profile, space-saving design. The rings are engineered with a reduced axial height while maintaining adequate cross-sectional strength for moderate to heavy loads. This flat profile makes the series particularly suitable for applications where overall equipment height must be minimized, such as low-bed trailers, mobile platforms, and height-restricted towing systems.

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. The mounting hole pattern is designed to maximize load distribution across the bearing surface while accommodating the low-profile geometry. The bearings are typically supplied with seals on both sides to prevent contamination from dirt, water, and debris commonly encountered in outdoor towing environments.