Application overview
How NSK bearings are specified for Machine Tool Spindles
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.
Spindle rebuild shops, grinding spindle builders and machine tool rebuilders replace the front and rear bearing sets that set runout, stiffness and maximum speed. These positions use super-precision angular contact sets, high-rigidity cylindrical roller bearings and precision ball bearings. Buyers care most about the exact tolerance class, matched set arrangement and preload, because a single wrong bearing can put the spindle out of runout specification.
- Quote the complete NSK reference, including contact angle, tolerance class and set suffix, not a shortened stock code.
- Order angular contact bearings as matched sets in the required arrangement (back-to-back, face-to-face or tandem) and confirm the preload class before dispatch.
- For high-speed, high-rigidity positions, specify the cylindrical roller bearing's internal clearance and taper bore so it can be checked against the measurement report.
- List front and rear spindle bearing positions separately with quantities, and state speed and lubrication method (grease or oil-air) so the correct series can be confirmed.
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
