Page 793 - Rollingbearings

Designation system

Group 4
4 1 4 2 4 3 4 4 4 5 4 6

Group 4.6: Other variants
R505 Bearing for railway axleboxes
VA405 Bearing for vibratory applications, surface-hardened stamped steel cages
VA406 Same as VA405, and PTFE coated cylindrical inner ring bore
VA991 Bearing for high-speed applications
VE552(E) Outer ring with three equally-spaced threaded holes in one side face to accommodate lifting
tackle The E indicates that appropriate eye bolts are supplied with the bearing
VE553(E) Same as VE552(E), but threaded holes in both side faces
VG114 Surface-hardened stamped steel cages
VQ424 Running accuracy better than C08

Group 4.5: Lubrication
GEM9 Filled to 70 – 100% with SKF LGHB 2 grease
GLE Filled to 25 – 45% with SKF LGWM 2 grease
VT143 Filled to 25 – 45% with SKF LGEP 2 grease
VT143B Filled to 45 – 60% with SKF LGEP 2 grease
VT143C Filled to 70 – 100% with SKF LGEP 2 grease
W64 Solid Oil
W Without annular groove and lubrication holes in the outer ring
W20 Three lubrication holes in the outer ring
W26 Six lubrication holes in the inner ring
W33 Annular groove and three lubrication holes in the outer ring
W33X Annular groove and six lubrication holes in the outer ring
W77 Plugged W33 lubrication holes
W513 W26 + W33

Group 4.4: Stabilization

Group 4.3: Bearing sets, matched bearings

9
Group 4.2: Accuracy, clearance, preload, quiet running
C08 Running accuracy to P5 tolerance class
C083 C08 + C3
C084 C08 + C4
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
P5 Dimensional and running accuracy to P5 tolerance class
P6 Dimensional and running accuracy to P6 tolerance class
P62 P6 + C2

Group 4.1: Materials, heat treatment
235220 Case-hardened inner ring with a helical groove in the bore
HA3 Case-hardened inner ring

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