Page 91 - Y-bearing-units

Data – general Tolerances
The bore and outside diameter of Y-bearings
Dimensions are produced to tolerances indicated in table 1.
• The boundary dimensions of Y-bearings in Symbols used are explained in the following.
the YAR 2, YET 2 and YEL 2 series are in The values specified for the tolerance zone of
accordance with ISO 9628:2006. the bore diameter of bearings in the YAT 2, YAR 2,
• The boundary dimensions of Y-bearings in YET 2 and YEL 2 series are slightly tighter than
the 17262(00)-2RS1 and 17263(00)-2RS1 Normal tolerances listed in ISO 9628:2006.
series are in accordance with those of deep The values specified for bearings in the 2
groove ball bearings in the 62 and 63 series 17262(00)-2RS1 and 17263(00)-2RS1 series
and are in accordance with ISO 15:1998, are in accordance with ISO 492:2002.
except that the bearings have a sphered SKF manufactures bearings in the YSA 2-2FK
outside diameter series with a tapered bore, taper 1:12. They
• The boundary dimensions of Y-bearings in are designed to fit adapter sleeves in the H 23
the YSA 2-2FK series are in accordance with series, for metric and inch shafts.
JIS 1558-1995 The hexagonal or square bore of bearings in
• Y-bearings in the YAT 2, YHB 2, YHC 2 and the YHB 2, YHC 2 and YQC 2 series is produced
YQC 2 series have not been standardized to a 0/+0,25 mm tolerance.
either nationally or internationally, but are
common in the marketplace. Symbols
d Nominal bore diameter
The dimensions of the adapter sleeves in the D dmp Deviation of the mean bore diameter
H 23 series, which are normally used to locate from the nominal
YSA 2-2FK bearings onto the shaft, are in D Nominal outside diameter
accordance with ISO 2982-1:1995. D Dmp Deviation of the mean outside diameter
from the nominal

Table 1
Tolerances for SKF Y-bearings
Nominal Inner ring Outer ring
diameter Bearings in the series All bearings
YAT 2, YAR 2, 17262(00)
YET 2, YEL 2 17263(00)
d, D D dmp D dmp D Dmp
Over Incl. High Low High Low High Low
mm µm µm µm

10 18 +15 +5 0 –8 – –
18 31,75 +18 +5 0 –10 – –
31,75 50,8 +19 +5 0 –12 0 –10
50,8 80,962 +21 +5 0 –15 0 –10
80,962 120 +25 +5 – – 0 –15
120 150 – – – – 0 –15
150 180 – – – – 0 –20

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