Recommended fits for shaft
General
In particular in case of high-speed bearings of the bearing types NGS and NGS-SBI, the accuracies of the fits and the geometrically correct design of all connecting parts are decisive for the function.
Errors in the adjacent construction can substantially increase the friction torque. Please observe the construction notes in the general catalogue chapter.
The actual dimension of the bearing bore can be found in the inspection report enclosed with every bearing.
Inner ring rotates
Design shaft diameter for NGS series according to table.
For special requirements, the clearance fit must be further restricted within the specified tolerance classes:
High running accuracy:
If maximum running accuracy requirements apply, the clearance fit should be 0. Otherwise the clearance fit can add itself to the bearing radial runout.
High speeds:
At higher speeds and longer duty cycles, a press fit of 0.005 mm must not be exceeded.
Inner ring stationary
Design shaft diameter for NGS-SBI series according to table.
On stationary shafts, the bearing inner ring must also be supported across its whole surface.