Page 155 - Rollingbearings

Tolerances and resultant its
Tolerances and

resultant fits

The tables in this section provide informa-
tion about bearing tolerances, seat toler-
ances and resultant its (ig. 7). These should
enable you to determine easily the max-
imum and minimum values of its when
using ISO tolerance classes for bearing seats
and bearings with Normal tolerances for the
bore and outside diameter. The SKF Bearing
Calculator (skf.com/bearingcalculator) pro-
vides a similar function for every individual
bearing.
The tables cannot be used for tapered
roller bearings when d ≤ 30 mm or
D ≤ 150 mm or for thrust bearings when
D ≤ 150 mm. The diameter tolerances for
these bearings deviate from the Normal tol­
erances for other rolling bearings.
The tables list:

• the upper and lower limits of bore or out­
side diameter deviations for bearings with
Normal tolerances
• the upper and lower limits of shaft or
housing bore diameter deviations for rele­
vant tolerance classes in accordance with
ISO 286 2
• the smallest and largest values of the the­ Bearing interfaces
oretical interference (–) or clearance (+)
• the smallest and largest values of the ±3σ
probable interference (–) or clearance (+) Fig. 7
Shaft and housing tolerances and resultant its B.6
The appropriate values for shaft seats are
listed for the following tolerance classes:

• f5, f6, g5, g6, h5 (table 11, page 154)
• h6, h8, h9, j5, j6 (table 12, page 156) Minimum Maximum
• js4, js5, js6, js7, k4 (table 13, page 158) clearance in clearance in
the housing
the housing
• k5, k6, m5, m6, n5 (table 14, page 160)
• n6, p6, p7, r6, r7 (table 15, page 162)
• r6+IT6, r7+IT7 (table 16, page 164)
Minimum Maximum
interference interference
The appropriate values for housing seats are on the shaft on the shaft
listed for the following tolerance classes:
• F7, G6, G7, H5, H6 (table 17, page 166)
• H7, H8, H9, H10, J6 (table 18, page 168)
• J7, JS5, JS6, JS7, K5 (table 19, page 170)
• K6, K7, M5, M6, M7 (table 20, page 172)
• N6, N7, P6, P7 (table 21, page 174)
Tolerance intervals Tolerance interval Tolerance interval
of the bearing bore of the housing seat of the shaft seat
and outside diameter

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