SKF - Rolling Bearings

Radial location of bearings
Shaft and housing tolerances and fits
The values listed for the shaft († tables 7,
page 178) and housing († tables 8, page
190) tolerances enable the character of the fit
to be established:
• the upper and lower limits of Normal tolerances
for the bearing bore or outside
diameter deviations
• the upper and lower limits of the shaft or
housing bore diameter deviations in accordance
with ISO 286-2
• the smallest and largest values of the theoretical
interference (–) or clearance (+) in
the fit
• the smallest and largest values of the probable
interference (–) or clearance (+) in the
fit
When bearings with higher dimensional accuracy
than Normal are used, the bore and
outside diameter tolerances are tighter.
Therefore, values for an interference or loose
fit need to be adjusted correspondingly. For
information about calculating these limits
more accurately, contact the SKF application
engineering service.
Note: The signs for clearance and interference
in this catalogue are in accordance with
ISO 286-1. Clearance is now indicated with a
“+” sign and interference with a “–” sign.
The appropriate values for rolling bearing
shaft seats are listed for the following
tolerances:
• f5, f6, g5, g6, h5 († table 7a, page 178)
• h6, h8, h9, j5, j6 († table 7b, page 180)
• js4, js5, js6, js7, k4 († table 7c, page 182)
• k5, k6, m5, m6, n5 († table 7d, page 184)
• n6, p6, p7, r6, r7 († table 7e, page 186)
• s6 min ± IT6/2, s7 min ± IT7/2 († table 7f,
page 188)
The appropriate values for rolling bearing
housing seats are listed for the following
tolerances:
F
• F7, G6, G7, H5, H6 († table 8a, page 190)
• H7, H8, H9, H10, J6 († table 8b, page 192)
• J7, JS5, JS6, JS7, K5 († table 8c, page 194)
• K6, K7, M5, M6, M7 († table 8d, page 196)
• N6, N7, P6, P7 († table 8e, page 198)
Normal tolerances for the bore and outside
diameter, for which the limiting values have
been calculated, are valid for all metric rolling
bearings except for metric tapered roller bearings
when d ≤ 30 mm or D ≤ 150 mm and
thrust bearings when D ≤ 150 mm. The diameter
tolerances for these bearings deviate
from the Normal tolerances for other rolling
bearings († tables 3 to 10, pages 137 to 144).
The values for the probable interference or
loose fit cover 99% of all the combinations.
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