The outer ring (or inner ring) of a double row tapered roller bearing is a single piece. The small end faces of the two inner rings (or outer rings) are similar, and there is a spacer in the middle. The clearance is adjusted by the thickness of the spacer. The thickness of the spacer can also be used to adjust the pre-interference of the double row tapered roller bearing.

Four-rows tapered roller bearing, the performance of this type of bearing is basically the same as that of double-row tapered roller bearing, but the radial load is larger than that of double-row tapered roller bearing, and the limit speed is slightly lower.

Tapered roller bearings are separable bearings, and both the inner and outer rings of the bearing have tapered raceways. The ability of a single row tapered roller bearing to withstand axial loads depends on the contact angle, that is, the angle of the outer ring raceway. The larger the angle, the greater the axial load capacity. The most used tapered roller bearings are single row tapered roller bearings.

Inch tapered roller bearings originated in the United Kingdom and the United States, and their structure and assembly dimensional accuracy and rotational accuracy are different from metric bearings. Mostly used for imported machinery or industries with special needs.

Deep groove ball bearings are suitable for high speed operation and are very durable. This type of bearing has a small friction coefficient and is used in precision instruments, low-noise motors, automobiles, motorcycles and general machinery and other industries.

The deep groove ball structure is also divided into two types: sealed and open. The open type means that the bearing does not have a sealed structure. The sealed deep groove ball is divided into dust-proof seal and oil-proof seal. The material of the dust-proof sealing cover is stamped steel plate, which only serves to prevent dust from entering the bearing raceway. The oil-proof type is a contact oil seal, which can effectively prevent the grease in the bearing from overflowing.