NSK rolling bearings are generally composed of a raceway, rolling elements, and a cage. They can be divided into radial bearings and thrust bearings according to the direction of load they bear. According to the type of rolling elements, they can be classified as ball bearings and roller bearings. They can also be categorized based on their shape and specific purposes. The representative structure classification of NSK bearings is as follows:
- Deep groove ball bearings: NSK single-row deep groove ball bearings come in open type, dust cover type (ZZ), contact rubber seal type (DDU), non-contact rubber seal type (VV), and those with stop rings. Standard ranges include 68, 69, 60, 160, 62, and 63 series, with an inner diameter range of 10-800mm.
- Radial thrust ball bearings (angular contact ball bearings): NSK single-row radial thrust ball bearings usually have contact angles of 30° (code A) and 40° (code B). NSK bearings also include radial thrust ball bearings with contact angles of 15° (code C) and 25° (code A5). Size ranges include 79A5, 79C, 70A, 70C, 72A, 72B, 72C, 73A, and 73B series, with an inner diameter range of 10-200mm.
NSK paired double angular contact ball bearings are available in back-to-back (DB), face-to-face (DF), and tandem paired double configurations (DT).
NSK double-row radial thrust ball bearings can withstand axial loads in two directions. Available in size series 52 and 53, with an inner diameter range of 10-85mm.
NSK four-point contact ball bearings have an inner ring split into two parts, with a contact angle of 35°. Suitable for pure axial loads or combined loads with large axial components. Inner diameter range 30-200mm.
- Self-aligning ball bearings: The allowable self-aligning angle of NSK self-aligning ball bearings is approximately 4°-7° under normal load conditions. Note that depending on surrounding installation dimensions, there may be special cases where this self-aligning angle cannot be achieved. Size ranges include 12, 22, 13, and 23 series, with an inner diameter range of 5-110mm.
- Cylindrical roller bearings: NSK single-row cylindrical roller bearings come in various designs, including NU, NJ, NUP, N, NF, and NH types (assembled from NJ type cylindrical roller bearings and L-shaped flange rings). Inner diameter range 20-500mm.
NSK double-row cylindrical roller bearings include NNU and NN types, with an inner diameter range of 25-360mm.
NSK cylindrical roller bearing usage note: If the load during operation is too small, sliding will occur between the rollers and the raceways, causing scuffing. This is especially true for large cylindrical roller bearings with heavy rollers and cages.
- Tapered roller bearings: NSK metric series tapered roller bearings, with an inner diameter range of 15-440mm.
NSK imperial series tapered roller bearings, with an inner diameter range of 12-206.375mm.
NSK double-row tapered roller bearings, with an inner diameter range of 40-260mm.
NSK tapered roller bearing usage note: During operation, if the load is too small, sliding will easily occur between the rollers and raceways that do not bear axial loads, causing scuffing. Large tapered roller bearings with heavy rollers and cages have this tendency.
- Self-aligning roller bearings: NSK self-aligning roller bearings, available in size ranges 213, 222, 223, 230, 231, 232, 240, and 241 series, with an inner diameter range of 25-1400mm.
NSK self-aligning roller bearings include high-load capacity designs such as EA, C, CD, and CA types. EA, C, and CD types use stamped cages, while CA types use bronze alloy cages.
NSK self-aligning roller bearings usage note: During operation, if the load is too small, sliding will occur between the rollers and raceways that do not bear axial loads, causing scuffing.
- Thrust bearings: NSK thrust ball bearings come in flat base and self-aligning spherical types. Inner diameter range 10-360mm.
NSK double-direction thrust ball bearings are available in flat base, self-aligning spherical, and spherical seat ring types. Inner diameter range 10-190mm.
NSK thrust cylindrical roller bearings are suitable for high-load applications and have high axial rigidity. They use bronze alloy machined cages. Inner diameter range 35-320mm.
NSK thrust self-aligning roller bearings have self-aligning properties, allowing a self-aligning angle of approximately 1°-2°. Inner diameter range 60-500mm.
- Needle roller bearings: NSK needle rollers and cage assemblies include FWJ, FWF, FBN, and FBNP series, with an inner diameter range of 5-100mm.
NSK pressed outer ring needle roller bearings include FJ, FJH, MFJ, MFJH, F, FH, MF, and MFH series, with an inner diameter range of 4-55mm.
NSK solid needle roller bearings include RNA 48, RNA 49, RNA 59, RNA 69, and RLM series, with an inner diameter range of 9-390mm.
NSK thrust needle roller bearings include FNTA, FTRA, FTRB, FTRC, FTRD, and FTRE series, with an inner diameter range of 10-100mm.
NSK bolt-type roller needle bearings include FCR, FCJ, FCRS, and FCJS series, with an outer diameter range of 16-90mm.
NSK snap ring type roller needle bearings include FYCR, FYCJ, FYCRS, and FYCJS series, with an inner diameter range of 5-50mm.