Page 14 - SKF-Food-Line-ball-bearing-units

Back Seal Shaft tolerances Permissible speed

The unit with back seal already mounted has The recommended fits for SKF Food Line ball SKF Food Line ball bearing units should not
to be placed without end cover on the shaft bearings are listed in table 1 For moderate operate at speeds above the limiting speeds
for Pillow block and on the machine frame loads (0,035 C < P ≤ 0,05 C), the shaft seats listed in the product tables Permissible
for flanged units (fig. 2) should be machined to an h7 tolerance speed is also influenced by the shaft diame-
ter tolerance
End cover is mounted in order to complete For light loads and low speeds, an h8 shaft
the unit mounting on the machine position tolerance is sufficient, and for very simple When using these bearing units on shafts
(fig. 3) applications, h9 to h11 shaft tolerances may with wider tolerances than h6, compare the
be used speed values listed in the product tables with
those listed in table 3 The lower value is the
Fig. 4 illustrates the relative position of the maximum or limiting permissible speed
upper and lower limits of the most com-
monly used ISO shaft tolerance classes The
values of these ISO tolerances are listed in
Mounting instructions
table 2

Fig. 4

Fig. 2 Fig. 3

B

h6 E h7 E h8 E E E
h9
h10 h11 E

Table 2 Table 3
ISO shaft deviations for SKF Food Line Permissible speeds for SKF Food Line
Shaft Shaft diameter deviations Bearing Permissible speeds for shafts
diameter h6� h7� h8� h9� h10� h11� size 1) machined to tolerance class
d Deviation h7� h8� h9� h11�
over incl high low high low high low high low high low high low d
mm µm – r/min

10 18 0 –11 0 –18 0 –27 0 –43 0 –70 0 –110 04 5 300 3 800 1 300 850
18 30 0 –13 0 –21 0 –33 0 –52 0 –84 0 –130 05 4 500 3 200 1 000 700
30 50 0 –16 0 –25 0 –39 0 –62 0 –100 0 –160 06 4 000 2 800 900 630
50 80 0 –19 0 –30 0 –46 0 –74 0 –120 0 –190 07 3 400 2 200 750 530
80 120 0 –22 0 –35 0 –54 0 –87 0 –140 0 –220 08 3 000 1 900 670 480
09 2 600 1 600 560 400

1) For example, bearing size 07 includes all bearings based
on a Y207 bearings such as YAR 207-2LPW/SS,
YAR 207-104-2LPW/SS, YAR 207-106-2LPW/SS,
YAR 207-107-2LPW/SS

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