Designation system

The complete designation for an insert bearing or a ball bearing unit consists of a basic designation with or without one prefix and/or one or more suffixes.

For details about the insert bearing designation system, refer to Insert bearings.

Ball bearing take-up units

Designation examples and the applicable options for ball bearing take-up units are given below.
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Examples


Metric units:
TUJ 20 TFwhereTUJ =
20 =
TF =

Inch unit:
WSTUC 115-CPSS-DFH
whereWSTU =
C =
115 =
CPSS =
DFH =

Applicable options for ball bearing take-up units

Housing/unit type

J stands for dimensions in accordance with JIS 1559-2009
TUTake-up housing
WSTU
Take-up housing

Housing material
Grey cast iron
C
Composite for the SKF Food Line

Size identification
Bearing units for metric shafts: bearing bore uncoded
20
to
60
20 mm
to
60 mm
M
Metric size and metric threads, where applicable (only for the SKF Food Line units)
Standard bearing units for inch shafts: bearing bore uncoded
3/4
to
2 3/16
3/4 in. (19,05 mm)
to
2 3/16 in. (55,563 mm)
SKF Food Line bearing units for inch shafts: bearing bore coded

Three-digits combination that follows the housing/unit type and material identification of the unit designation: the first digit is the number of whole inches and the second and third digits are the number of sixteenths of an inch.
012
to
115
3/4 in. (19,05 mm)
to
1 15/16 in. (49,213 mm)
Housings made of cast iron or composite for the SKF Food Line
504
to
512
for insert bearings of sizes 204, 204-012
to
for insert bearings of size 212

Additional housing features
L
Next larger size than normal (inch units only)
S
Next smaller size than normal (inch units only)

Inserted bearing
CPSSStainless steel insert bearing with grub screws, special bearing design for DFH units
FMInsert bearing with an eccentric locking collar, YET 2 series
TF
Insert bearing with grub screws, YAR 2-2F series
TPSS
Stainless steel insert bearing with grub screws, YAR 2-2LPW/SS series
TPZMInsert bearing with grub screws, zinc-coated inner and outer rings, YAR 2-2LPW/ZM series

Suffixes - other features
DFH
Sealed unit (back seal and end cover installed)
SKF logo