skf single row tapered roller bearing designations

SKF metric bearings

The designations of metric tapered roller bearings follow one of the following principles:

  • The series designations in accordance with ISO 355 consist of a digit and two letters. The digit represents the contact angle. The two letters represent the diameter and width series, respectively. This is followed by a three-digit bore diameter d [mm]. The basic designations of SKF tapered roller bearings start with the letter T, e.g. T2ED 045.
  • Designations established prior to 1977 are based on the system shown under SKF bearing designation, e.g. 32210.
  • Metric bearings with the designation prefix J follow the ABMA designation system, which is used for inch bearings (→ ANSI/ABMA Std. 19.1). 

SKF inch bearings

Inch tapered roller bearing designations are in accordance with ANSI/ABMA Std. 19.2.

Within a series:

  • roller and cage assemblies are equal but the inner and outer rings can have different sizes and designs 
  • any inner ring with roller and cage assembly (cone) can be assembled with any outer ring (cup) 

General:

  • cup and cone have individual designations and can be supplied separately
  • designations of cups and cones, as well as the series, consist of a three- to six-digit number, which may be prefixed to characterize a bearing series from extra-light to extra-heavy
  • complete bearing designation is an abbreviated combination of cone and cup designations; 
    it consists of the cone designation followed by the complete or parts of the cup designation, separated by an oblique stroke

SKF single row tapered roller bearing designation

SKF tapered roller bearings designation follow a system that may consist of a basic designation with or without one or more prefixes and/or suffixes.

1 Prefixes
J Metric bearing following the ABMA designation system (ANSI/ABMA Std. 19.2)
T Metric bearing in accordance with ISO 355 
2 Basic designation
3 Suffixes - Internal design
B Steep contact angle
4 Suffixes - External design (seals, snap ring groove etc.)
R Flanged outer ring 
X Boundary dimensions changed to conform to ISO
5 Suffixes - Cage design
TN9 Glass fibre reinforced PA66 cage, roller centred
TNH Glass fibre reinforced PEEK cage, roller centred 
6.1 Suffixes - Materials, heat treatment
HA1 Case-hardened inner and outer rings
HA2 Case-hardened outer ring
HA3 Case-hardened inner ring 
HA4 Case-hardened inner and outer rings and rollers
HA5 Case-hardened rollers
HB1 Bainite-hardened inner and outer rings 
HN3 Inner ring with special surface heat treatment 
L4B Bearing rings and rollers with special surface coating
6.2 Suffixes - Accuracy, clearance, preload, quiet running
/1 
/-1 

to 

/-3 
/4 
Deviating width tolerances of cups and cones for inch bearings
CL0 Geometrical tolerances to ABMA tolerance class 0 (inch bearing)
CL00 Geometrical tolerances to ABMA tolerance class 00 (inch bearing)
P5 Geometrical tolerances to P5 tolerance class 
U.. U combined with a one- or two-digit number identifies tighter total width tolerance, e.g.: 
U2 → +5/0 µm 
U4 → +10/0 µm 
W Modified ring width tolerance to +5/0 µm 
6.3 Suffixes - Bearing sets, matched bearings  (n.a.) 
6.4 Suffixes - Stabilization (n.a.)
6.5 Suffixes - Lubrication (n.a.)
6.6 Suffixes - Other variants
CL7A Pinion bearing, superseded by CL7C
CL7C High-performance design
CLN Tighter tolerances for ring widths and total (abutment) width in accordance with ISO tolerance class 6X
PEX  SKF Explorer bearing, used only when same-sized basic design bearing and SKF Explorer bearing are available 
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 
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 ring side face 3 mm and of large outer ring side face 2 mm 
VB481 Chamfer dimension of large inner ring side face 8,5 mm 
VC027 Modified internal geometry for increased permissible misalignment 
VC068 Tighter geometrical tolerances and special heat treatment 
VE141 One locating slot (notch) in the outer ring 
VE174 One locating slot (notch) in the large side face of the outer ring, tighter geometrical tolerances
VQ051 Modified internal geometry for increased permissible misalignment 
VQ117 Special radial and axial run-out tolerances
VQ267 Tighter inner ring width tolerance to ± 25 µm
VQ492 Special inner ring width tolerance 
VQ494 Tighter radial run-out tolerances 
VQ495 CL7C with tighter or shifted tolerance range for the outside diameter 
VQ506 Tighter inner ring width tolerance 
VQ507 CL7C with tighter or shifted tolerance range for the outside diameter 
VQ523 CL7C with tighter inner ring width tolerance and tighter or shifted tolerance range for the outside diameter 
VQ601 Geometrical tolerances to ABMA tolerance class 0 (inch bearing) 

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