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Designation system

In addition to their designation, four-row tapered roller bearings are also identified by their design variants/features (→ product tables TQI and TQO designs). Some of these features may not be part of the bearing designation, but are always part of the design variants/features (→ Designs and variants).
Examples and the applicable options for four-row tapered roller bearings are given below.
Basic bearing designation system
Examples
BT4B 328827 ABG/HA1VA902
whereBT4B 328827 =
AB =
G =
HA1 =
VA902 =
BT4-8109 E1/C800
whereBT4-8109 =
E1 =
C800 =
330870 BG
where330870 =
B =
G =


Applicable options for four-row tapered roller bearings

Test Designation 1
  Prefixes (n.a.)

Test Designation 2
Basic designation (drawing number)
BT4-
BT4B
Drawing number prefixes that may precede a four- or six-digit drawing number

Catalogue image - Test Designation 3
Suffixes - Internal design
A, B, C, D
Deviating or modified internal design, combinations are possible

Test Designation 4
Suffixes - Explorer class and external design (seals, helical groove, etc.)
ESKF Explorer bearing without intermediate rings
EXSKF Explorer bearing with intermediate rings
E(X)1
SKF Explorer bearing, HNBR contact seal on both sides, otherwise manufactured to VA901 specifications
E(X)2
SKF Explorer bearing, HNBR contact seal on both sides, otherwise manufactured to VA902 specifications
E(X)3
SKF Explorer bearing, HNBR contact seal on both sides, otherwise manufactured to VA903 specifications
E8
Optimized SKF Explorer bearing without intermediate rings, optimized design, open bearing but with recess in the outer rings for installing seals at a later stage if needed
E81
Optimized SKF Explorer bearing without intermediate rings, optimized design, HNBR contact seal on both sides
E8X
Optimized SKF Explorer bearing with intermediate rings, optimized design, open bearing but with recess in the outer rings for installing seals at a later stage if needed
E8X1Optimized SKF Explorer bearing with intermediate rings, optimized design, HNBR contact seal on both sides
For additional information about design variants/features → Designs and variants

Catalogue image - Test Designation 5
Suffixes - Cage design (n.a.)

Catalogue image - Test Designation 6.1
Suffixes - Materials, heat treatment
HA1
Case-hardened inner and outer rings
HA4
Case-hardened inner and outer rings and rollers
HE1
Inner and outer rings made of vacuum remelted steel

Test Designation 6.2Suffixes - Internal clearance
C...
Axial internal clearance; the three-digit number immediately following the C is the mean axial internal clearance in µm
(for clearance values not listed in the product tables, contact SKF)

Catalogue image - Test Designation 6.3
Suffixes - Bearing sets, matched bearings (n.a.)

Test Designation 6.4
Suffixes - Stabilization (n.a.)


Suffixes - Lubrication (n.a.)

Test Designation 6.6
Suffixes - Other variants
VA901
FKM contact seal on both sides, outer ring side faces with lubrication grooves, sealing ring between the inner rings
VA902
FKM contact seal on both sides, without relubrication features, sealing ring between the inner rings
VA903
FKM contact seal on both sides, outer ring side faces with lubrication grooves, without sealing ring between the inner rings
VA919
FKM contact seal on both sides, relubrication features in the outer rings, annular groove in the bore and lubrication holes in the inner ring guide flanges
VA941
FKM contact seal on both sides, inner ring inner side faces with lubrication grooves, inner rings with annular grooves in the bore and lubrication holes in their outer shoulders
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