Page 261 - Rollingbearings

Designation system

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Group 4
4.1 4.2 4.3 4.4 4.5 4.6

Group 4.6: Other variants
VP311 SKF Food Line bearing: Blue­coloured contact seal made of FDA and EC approved NBR and
lubricant (GFJ) registered by NSF as category H1
VQ658 Quiet running properties

Group 4.5: Lubrication
GE2 r
GFJ s
GJN
HT s
LHT23 s
LT f Grease sufixes (table 3, page 245)
LT10 s
MT33 s
MT47
VT378 s
WT c

Group 4.4: Stabilization

S0 Bearing rings heat stabilized for operating temperatures ≤ 150 °C (300 °F)
S1 Bearing rings heat stabilized for operating temperatures ≤ 200 °C (390 °F)

Group 4.3: Bearing sets, matched bearings
DB Two bearings matched for mounting back-to-back
DF Two bearings matched for mounting face-to-face
DT Two bearings matched for mounting in tandem

Group 4.2: Accuracy, clearance, preload, quiet running
P5 Dimensional and running tolerances to class P5
P6 Dimensional and running tolerances to class P6
P52 P5 + C2
P62 P6 + C2
P63 P6 + C3
CN Normal radial internal clearance; only used together with an additional letter that identiies a
reduced or displaced clearance range
H = Reduced clearance range corresponding to the upper half of the actual clearance range
L = Reduced clearance range corresponding to the lower half of the actual clearance range
P = Displaced clearance range comprising the upper half of the actual clearance range plus
the lower half of the next larger clearance range
The above letters are also used together with the clearance classes C2, C3, C4 and C5, e g
C2H
C1 Radial internal clearance smaller than C2
C2 Radial internal clearance smaller than Normal
C3 Radial internal clearance greater than Normal
C4 Radial internal clearance greater than C3
C5 Radial internal clearance greater than C4
CA Matched bearing set with small axial internal clearance
GA Matched bearing set with light preload

Group 4.1: Materials, heat treatment
HA1 Case­hardened inner and outer rings

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