Supplementary designations

The designation suffixes used to identify certain features of SKF single row tapered roller bearings are explained in the following.
BSteeper contact angle than standard design
CLNReduced tolerances for ring widths and total (abutment) width; corresponds to ISO tolerance class 6X
CL0Accuracy to ABMA tolerance class 0 for inch bearings
CL3Accuracy to ABMA tolerance class 3 for inch bearings
CL7AHigh-performance design for pinion bearing arrangements (superseded by CL7C)
CL7CHigh-performance design for pinion bearing arrangements
HA1Case-hardened inner and outer rings
HA3Case-hardened inner ring
HN1Inner and outer ring with special surface heat treatment
HN3Inner ring with special surface heat treatment
JPressed window-type steel cage, roller centred. A figure following the J indicates a different cage design
P6Dimensional and running accuracy to old ISO tolerance class 6, better than Normal
QOptimized contact geometry and surface finish
RFlanged outer ring
TN9Injection moulded window-type cage of glass fibre reinforced polyamide 66, roller centred
U.U combined with a one-figure number identifies reduced total width tolerance.
Examples:
U2 Total width tolerance +0,05/0 mm
U4 Total width tolerance +0,10/0 mm
see also table
VA321Optimized internal design
VA606Crowned raceway on bearing rings and special heat treatment
VA607Crowned raceway on bearing rings and special heat treatment
VB022Chamfer dimension at large outer ring face 0,3 mm
VB026Chamfer dimension at large inner ring side face 3 mm
VB061Chamfer dimension at large inner ring side face 8 mm
VB134Chamfer dimension at large inner ring side face 1 mm
VB406Chamfer dimension at large inner ring side face 3 mm and at large outer ring side face 2 mm
VB481Chamfer dimension at large inner ring side face 8,5 mm
VC027Modified internal geometry for increased permissible misalignment
VC068Increased running accuracy and special heat treatment
VE174One locating slot in outer ring at large outer ring side face, increased running accuracy
VQ051Modified internal geometry for increased permissible misalignment
VQ267Reduced inner ring width tolerance, ± 0,025 mm
VQ495As CL7C but with reduced or displaced tolerance for the outside diameter
VQ506Reduced inner ring width tolerance
VQ507As CL7C but with reduced or displaced tolerance for the outside diameter
VQ523As CL7C but with reduced inner ring width tolerance and reduced or displaced tolerance for the outside diameter
VQ601Accuracy to ABMA tolerance class 0 for inch bearings
WModified ring width tolerance, +0,05/0 mm
XBoundary dimensions changed to conform to ISO