Page 389 - Rollingbearings

Designs and variants
Four-point contact Bearings with locating slots SKF Explorer
ball bearings Four-point contact ball bearings can be sup- bearings

plied with two locating slots in the outer ring
Four-point contact ball bearings (ig. 4, (designation sufix N2, ig. 7): For information, refer to page 7
page 385) are radial single row angular con-
tact ball bearings with raceways that are • preventing the bearing from turning
designed to support axial loads in both • positioned 180° apart
directions For a given axial load, a limited
radial load can also be supported (Load ratio, The dimensions and tolerances of the loca- 3
page 403) The bearings are separable, i e ting slots are in accordance with ISO 20515
the outer ring with ball and cage assembly and are listed in table 1
can be mounted separately from the two
inner ring halves
These bearings take up considerably less
axial space than double row bearings
Both inner ring halves of SKF Explorer
four-point contact ball bearings have a
recessed shoulder This improves oil low
when the bearing is used in combination
with an SKF cylindrical roller bearing (ig. 12, Table 1
page 403). In addition, these recesses can Locating slots in the outer ring of four-point contact ball bearings
be used to facilitate dismounting.
When four-point contact ball bearings are
subjected to high clamping forces their inner A b t A
r 0
ring deformation is limited.

SKF standard assortment
• bearings in the QJ 2 and QJ 3 series D 45 °
• some sizes in the QJ 10 and QJ 12 series h
(skf com/go/17000-3-4)

Outside diameter Dimensions Tolerance 1)
Diameter series 2 Diameter series 3
D h b r 0 h b r 0 t
> ≤ U

mm mm mm

35 45 2,5 3,5 0,5 – – – 0,2
45 60 3 4,5 0,5 3,5 4,5 0,5 0,2
60 72 3,5 4,5 0,5 3,5 4,5 0,5 0,2
Fig. 7
72 95 4 5,5 0,5 4 5,5 0,5 0,2
Four-point contact bearing with locating 95 115 5 6,5 0,5 5 6,5 0,5 0,2
slots 115 130 6,5 6,5 0,5 8,1 6,5 1 0,2
130 145 8,1 6,5 1 8,1 6,5 1 0,2
145 170 8,1 6,5 1 10,1 8,5 2 0,2
170 190 10,1 8,5 2 11,7 10,5 2 0,2
190 210 10,1 8,5 2 11,7 10,5 2 0,2
210 240 11,7 10,5 2 11,7 10,5 2 0,2
240 270 11,7 10,5 2 11,7 10,5 2 0,2
270 400 12,7 10,5 2 12,7 10,5 2 0,4

1) Other tolerances are in accordance with ISO 20515

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