Designation system
The complete designation for a Y-bearing or a Y-bearing unit consists of a basic designation with or without one prefix and/or one or more suffixes.
For details about Y-bearing designation system, refer to Y-bearings.
Y-bearing units
Designation examples and the applicable options for Y-bearing units are given below.


Examples
Metric unit: | |||
SYK 20 TD | where | SY = | ![]() |
K = | ![]() |
||
20 = | ![]() |
||
TD = | ![]() |
||
FYWK 50 LTHR | where | FY = | ![]() |
W = | ![]() |
||
K = | ![]() |
||
50 = | ![]() |
||
L = | ![]() |
||
THR = | ![]() |
Inch unit: | |||
SY 2 11/16 LF/AH
| where | SY = | ![]() |
2 11/16 = | ![]() |
||
LF | ![]() |
||
AH = | ![]() |
Applicable options for Y-bearing units
![]() | Housing/unit type |
| J stands for dimensions in accordance with JIS 1559-2009 for normal base plummer block, flanged and take-up housings
|
| W at the end of the housing series designation identifies an SKF Food Line Y-bearing unit or housing
|
FY | Square flanged housing |
FYA
| 3-bolt bracket flanged housing |
FYC |
Round flanged housing |
FYM | Square flanged housing, higher load carrying capacity |
FYT(B) | Oval flanged housing |
P | Plummer block housing, pressed steel |
P .. R | Plummer block housing, pressed steel, rubber seating ring included |
PF
| Round flanged housing, pressed steel |
PFD | Triangular flanged housing, pressed steel |
PFT | Oval flanged housing, pressed steel |
SY | Plummer block housing, normal base |
SYF | Plummer block housing, short base |
SYH | Plummer block housing, normal base, lower centre height H1 |
SYM | Plummer block housing, normal base, higher load carrying capacity |
TU | Take-up housing |
![]() | Housing material |
– | Grey cast iron |
D | Spheroidal graphite cast iron |
K
| Composite |
R
| Stainless steel
|
![]() | Size identification |
Bearing units for metric shafts: bearing bore uncoded | |
12
to 100 | 12 mm
to 100 mm |
Bearing units for inch shafts: bearing bore uncoded
|
|
1/2
to 3 | 1/2 in. (12,7 mm)
to 3 in. (76,2 mm) |
Housings made of cast iron, composite, composite for SKF Food Line or stainless steel | |
503
to 520 | for Y-bearings of sizes 203, 203-008, 203/12 and 203/15
to for Y-bearings of size 220 |
Housings made of pressed steel (not supplied as bearing unit) | |
40
to 90 | 40 mm housing bore diameter
to 90 mm housing bore diameter |
![]() | Additional housing features |
A
| Next smaller size than normal (inch units only)
|
L | Suitable for ECL end cover |
N |
Relubricable execution of composite housing. In case of SKF Food Line Y-bearing units only used in combination with suffix VZ1A2 (→ |
Y | Suitable for ECW end cover |
Z | Short base unit with inch thread |
![]() | Inserted Y-bearing |
FM | Y-bearing with an eccentric locking collar, YET 2 series |
KF | Y-bearing with a tapered bore on an adapter sleeve, YSA 2-2FK series
|
LD, LDW
| Y-bearing with SKF ConCentra locking, YSPAG 2 series |
LF | Y-bearing with SKF ConCentra locking, YSP 2-2F series |
RM
| Y-bearing with grub screws, YAT 2 series
|
TA | SKF Food Line Y-bearing with grub screws, YAR 2-2RF/VE495 series |
TD, TDW
| Y-bearing with grub screws, YARAG 2 series |
TF
| Y-bearing with grub screws, YAR 2-2F series
|
TH
| SKF Food Line Y-bearing with grub screws, YAR 2-2RF/HV series |
THR
| SKF Food Line Y-bearing with grub screws, YAR 2-2RFGR/HV series |
TR
| Y-bearing with grub screws, YAR 2-2RF series |
WD, WDW
| Y-bearing with an eccentric locking collar, YELAG 2 series |
WF | Y-bearing with an eccentric locking collar, YEL 2-2F series |
WR | Y-bearing with an eccentric locking collar, YEL 2-2RF series |
![]() | Suffixes - other features
|
AH | Y-unit for air-handling application |
VL065 | Zinc-coated bearing inner ring bore and side faces |
VZ1A2
| Relubricable execution of SKF Food Line Y-bearing unit with composite housing, only used in combination with suffix N (→ ![]() |