Double-row cylindrical roller bearings are commonly available in the following types: NN type double-row cylindrical roller bearings, NN…K type double-row cylindrical roller bearings with tapered inner, NNU type double-row cylindrical roller bearings without inner-ring ribs, and NNU…K type double-row cylindrical roller bearings with tapered inner and without inner-ring ribs.

Common types of single-row cylindrical roller bearings include: NU type: cylindrical roller bearing with no ribs on the inner ring, NJ type: with one rib on the inner ring, NUP type: with one rib on the inner ring and a flat thrust ring, N type: with no ribs on the outer ring, NH type: with one rib on the inner ring and a tapered thrust collar, NF type: with one rib on the outer ring, RNU type: cylindrical roller bearing without inner ring, RN type: cylindrical roller bearing without outer ring.

Cylindrical roller bearings refer to radial roller bearings with cylindrical rollers as rolling elements. We classify them based on the number of roller rows and the presence or absence of ribs on the inner and outer rings, and introduce several common types of cylindrical roller bearings.

Double-row angular contact ball bearings include the basic type with a contact angle α = 30°, designated as the 00000 A type; double-row angular contact ball bearings with filling slots, designated as the 00000 type (α = 30°); double-row angular contact ball bearings with dust shields or sealing rings on both sides, designated as the 00000 A-2Z type (α = 30°) and 00000 A-2RS type (α = 30°); and double inner-ring double-row angular contact ball bearings (basic type), designated as the 00000 D type (α = 45°).

Separable single-row angular contact ball bearings include S7 (angular contact ball bearings with a separable outer ring), SN7 (with a separable inner ring), QJ (four-point contact ball bearings with split inner rings), QJF (four-point contact ball bearings with split outer rings), and QJS (three-point contact ball bearings with split inner rings).