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Fits for needle roller bearings with an inner ring

The main dimensions of needle roller bearings with an inner ring have tight tolerances. In order to achieve a good bearing seat while at the same time being easy to assemble, the outside diameter of the shafts or the inside diameter of the bores are tolerated according to the fit system. The recommended shaft and bore fits are given below.

Recommended fit for the shaft

LoadShaft diameterDimensional tolerance
Low and variable loads
(P ≤ 0,05 C)
Dw ≤ 10 mmk5
10 < Dw ≤ 25 mmk6
25 < Dw ≤ 100 mmm6
Normal to high loads
(0,05 C < P ≤ 0,1 C)
Dw ≤ 25 mmk5
25 < Dw ≤ 60 mmm6
60 < Dw ≤ 100 mmn6
100 < Dw ≤ 400 mmp6
High to very high loads
(P > 0,1 C)
50 < Dw ≤ 100 mmn6
100 < Dw ≤ 200 mmp6
Dw > 200 mmr6
C = basic dynamic load rating | P = equivalent dynamic bearing load
Dimensional tolerance limits

Recommended fit for the bore

LoadLimitationDimensional tolerance
Point load on the outer ring, e.g.:
Umfangslast am Außenring Umfangslast am Außenring
Heat supply through the shaftnoneG7
Light to normal loads (P ≤ 0,1 C)noneH8
High loads (P > 0,1 C)noneH7
Indefinite load directionLight to normal loads (P ≤ 0,05 C)noneJ7
Normal to high loads (P > 0,05 C)Only for unsplit housingsK7
High impact loadsOnly for unsplit housingsM7
Circumferential load on the outer ring, e.g.:
Umfangslast am Außenring Umfangslast am Außenring Umfangslast am Außenring
Small and variable Loads (P ≤ 0,05 C)Only for unsplit housingsM7
Normal to high loads (0,05 C < P ≤ 0,1 C)Only for unsplit housingsN7
Very high loads (P > 0,1 C)Only for unsplit housingsP7
C = basic dynamic load rating | P = equivalent dynamic bearing load
Dimensional tolerance limits

This information is to be seen as a recommendation. The data has been carefully compiled from various sources, but no guarantee is given for any information.