Designation system
The complete designation for a 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 insert bearing designation system, refer to Insert bearing.
Ball bearing units
Designation examples and the applicable options for ball bearing units are given below.
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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 ball 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 ball 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 insert bearing of sizes 203, 203-008, 203/12 and 203/15
to for insert bearing 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 ball bearing units only used in combination with suffix VZ1A2 (→ |
| Y | Suitable for ECW end cover |
| Z | Short base unit with inch thread |
| Inserted bearing |
| FM | insert bearing with an eccentric locking collar, YET 2 series |
| KF | insert bearing with a tapered bore on an adapter sleeve, YSA 2-2FK series
|
| LD, LDW
| insert bearing with SKF ConCentra locking, YSPAG 2 series |
| LF | insert bearing with SKF ConCentra locking, YSP 2-2F series |
| RM
| insert bearing with grub screws, YAT 2 series
|
| TA | SKF Food Line insert bearing with grub screws, YAR 2-2RF/VE495 series |
| TD, TDW
| insert bearing with grub screws, YARAG 2 series |
| TF
| insert bearing with grub screws, YAR 2-2F series
|
| TH
| SKF Food Line insert bearing with grub screws, YAR 2-2RF/HV series |
| THR
| SKF Food Line insert bearing with grub screws, YAR 2-2RFGR/HV series |
| TR
| insert bearing with grub screws, YAR 2-2RF series |
| WD, WDW
| insert bearing with an eccentric locking collar, YELAG 2 series |
| WF | insert bearing with an eccentric locking collar, YEL 2-2F series |
| WR | insert bearing with an eccentric locking collar, YEL 2-2RF series |
| Suffixes - other features
|
| AH | Unit for air-handling application |
| VL065 | Zinc-coated bearing inner ring bore and side faces |
| VZ1A2
| Relubricable execution of SKF Food Line ball bearing unit with composite housing, only used in combination with suffix N (→ ).
|
