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Tapered roller bearings Designation system

2018-01-23

Prefixes:

E2.      SKF Energy Efficient bearing
J           Metric bearing following the ABMA designation system (ANSI/ABMA
Standard 19.2)
T          Metric bearing in accordance with ISO 355

Internal design:

B         Steep contact angle

Group 2: External design (seals, snap ring groove etc.)

R      Flanged outer ring
T       A number immediately following the T identifies the total width of matched bearings, arranged
back-to-back or in tandem.
X       Boundary dimensions changed to conform to ISO
Group 3: Cage design
J        Stamped steel cage, roller centred. A number following the J indicates a different cage design.
TN9     Glass fibre reinforced PA66 cage, roller centred
TNH     Glass fibre reinforced PEEK cage, roller centred
Group 4.1: Materials, heat treatment
HA1     Case-hardened inner and outer rings
HA3     Case-hardened inner ring
HN1    Inner and outer rings with special surface heat treatment
HN3     Inner ring with special surface heat treatment

Group 4.6:  Other variants
CL7A      Pinion bearing, superseded by CL7C
CL7C     High-performance design
CLN      Reduced tolerances for ring widths and total (abutment) width in accordance with
ISO tolerance class 6X
PEX     SKF Explorer bearing on customer request
Q      Optimized contact geometry and surface finish
V001     CL7C and /2
VA321      Optimized internal design
VA606      Crowned raceway on the outer ring, logarithmic profile on the inner ring and special
heat treatment
VA607     Same as VA606, but other outside diameter tolerance
VC027     Modified internal geometry for increased permissible misalignment
VC068     Increased running accuracy and special heat treatment
VQ051     Modified internal geometry for increased permissible misalignment
VQ267    Reduced inner ring width tolerance to ± 0,025 mm
VQ495     CL7C with reduced or shifted tolerance range for the outside diameter
VQ506     Reduced inner ring width tolerance
VQ507     CL7C with reduced or shifted tolerance range for the outside diameter
VQ523     CL7C with reduced inner ring width tolerance and reduced or shifted tolerance range
for the outside diameter
VQ601    Accuracy to ABMA tolerance class 0 for inch bearings
VB022    Chamfer dimension of large outer ring side face 0,3 mm
VB026    Chamfer dimension of large inner ring side face 3 mm
VB061    Chamfer dimension of large inner ring side face 8 mm
VB134    Chamfer dimension of large inner ring side face 1 mm
VB406    Chamfer dimension of large inner and outer ring side faces 3 mm
VB481    Chamfer dimension of large inner ring side face 8,5 mm
VE174    One locating slot in the large side face of the outer ring, improved running accuracy
Group 4.5: Lubrication
Group 4.4: Stabilization
Group 4.3: Bearing sets, matched bearings
DB      Two bearings matched for mounting back-to-back. A number immediately following
the DB identifies the design of the spacer rings.
DF       Two bearings matched for mounting face-to-face. A number immediately following
the DF identifies the design of the spacer ring.
DT      Two bearings matched for mounting in tandem. A number immediately following the
DT identifies the design of the spacer rings.
Group 4.2: Accuracy, clearance, preload, quiet running

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