Recommended fits for housing
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 outer diameter can be taken from the inspection report enclosed with the bearing.
Outer ring stationary
Housing for series NGS is to be designed with a clearance fit according to G7 or without centring.
Outer ring rotates
Housings for the NGS-SBI series are to be designed according to the table.
For special requirements, the clearance fit must be further restricted within the specified tolerance classes:
High accuracy requirements:
If maximum running accuracy is specified, the clearance fit 0 should be aimed for. 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.