Page 612 - Rollingbearings

7 Needle roller bearings
Shaft and housing For additional information about race- Alignment needle roller bearings
tolerances ways, refer to Raceways on shafts and in Suitable tolerance classes for the housing
bore and shaft for bearings with or without
housings, page 179.
an inner ring are provided in table 16
The following tables provide tolerance Drawn cup needle roller bearings
classes to obtain suitable its and an appro- Combined needle roller bearings
priate operating clearance (page 598) for Suitable tolerance classes for the housing
the following bearings: bore and shaft for bearings with or without Suitable tolerance classes for the housing
an inner ring are provided in table 16. bore and shaft for bearings with or without
• drawn cup needle roller bearings an inner ring are provided in table 17
• needle roller bearings with machined Needle roller bearings with
rings machined rings
• alignment needle roller bearings
• combined needle roller bearings • Suitable tolerance classes for the shaft for
bearings with machined inner and outer
Shaft and housing raceway tolerances signif- rings are provided in table 18.
icantly inluence the operating clearance of • Housing seat tolerances for standard con-
needle roller and cage assemblies and nee- ditions are provided in table 8, page 151.
dle roller bearings with a machined outer
ring (without an inner ring) and, therefore,
are provided under Operating clearance,
page 598.

Table 16
Shaft and housing tolerance classes for drawn cup and alignment needle roller bearings

7 Housing material 1) Tolerance classes 2) Raceway on the shaft Shaft inner ring seat
Housing bore seat 3)

Steel, cast iron N6 h5 k5
Light alloy R6 h5 k5

1) For housings that are not rigid, determine the shaft tolerance by trial and error
2) The envelope requirement (symbol � from ISO 14405-1) is not shown but applies to all tolerance classes
3) The geometrical tolerance in accordance with ISO 1101 for the housing bore of drawn cup needle roller bearings must correspond
to IT5/2 tolerance grade

Table 17
Shaft and housing tolerance classes for combined needle roller bearings
Thrust part Tolerance class 1)
Housing bore seat Shaft (raceway and inner ring
seat)

Angular contact ball bearing M6 k5
Thrust ball bearing K6 2) k5

Cylindrical roller thrust bearing K6 2) k5

1) The envelope requirement (symbol � from ISO 14405-1) is not shown but applies to all tolerance classes
2) For stiff bearing arrangements, SKF recommends an M6 � housing bore tolerance class.

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