Application overview
How NSK bearings are specified for Gearboxes & Speed Reducers
The right NSK bearing for this application is defined by its full part number, its position in the assembly and its exact execution, not by bore and outside diameter alone. Feed Mechanisms Company supplies genuine NSK bearings matched to that complete specification.
Industrial gearboxes and speed reducers support input, intermediate and output shafts on tapered, cylindrical, needle and spherical roller bearings, with spherical roller thrust bearings in heavy axial positions. Gear mesh produces combined radial and axial loads, often with shock and shaft deflection. Buyers have to match the structure and clearance for each shaft position, so repairs keep the original mesh alignment.
- Order tapered roller bearings in the original pairing and arrangement, and confirm how axial clearance is set at assembly.
- Check cage material and internal clearance on cylindrical and spherical roller bearings for oil-lubricated, high-temperature housings.
- Use needle bearings in compact planet and eccentric positions where radial space is limited, and confirm whether an inner ring is needed.
- Specify spherical roller thrust bearings for heavy axial loads on vertical or output shafts with possible misalignment.
Selection checkpoints
Four points we confirm on every enquiry before the bearing is quoted.
- 01
Complete part number
- Full NSK suffix, not a shortened stock code
- Original seal or shield type
- Internal clearance and precision class
- 02
Matched set and preload
- Paired or grouped sets for spindles and feed axes
- Preload arrangement checked before dispatch
- Speed and lubrication taken into account
- 03
Exact execution
- Special structures matched to the machine specification
- Adapter sleeve or housing model recorded
- Alternatives listed separately, changes approved by you
- 04
Genuine NSK, documented
- Original NSK packaging
- Certificates and full documentation
- Measurement report where the order requires it
