SY 55 LF
Pillow block ball bearing unit with extended inner ring and SKF ConCentra locking, cast iron, ISO standards
Pillow (plummer) block ball bearing units consist of an insert bearing mounted in a cast iron housing that can be bolted to a support surface.
It has an inner ring extended on both sides and is locked onto the shaft by a SKF ConCentra locking, creating a true concentric tight fit, and setting the correct internal clearance within the bearing, and making it easy to mount.
- Strong
- Ready to mount
- Lubricated and sealed bearing
- Quick locking onto the shaft
- Cost-effective
Dimensions
| d |
55 mm
|
Bore diameter |
| d1 |
≈69.06 mm
|
Shoulder diameter of inner ring |
| d2 |
77.6 mm
|
Outside diameter of locking ring |
| A |
60 mm
|
Base width |
| A1 |
40 mm
|
Top width |
| A5 |
37.5 mm
|
Standout of end cover |
| B |
40 mm
|
Width of inner ring |
| B1 |
49.2 mm
|
Overall bearing width |
| H |
63.5 mm
|
Height of spherical seat centre |
| H1 |
24 mm
|
Foot height |
| H2 |
126 mm
|
Overall height |
| J |
171.5 mm
|
Distance between attachment bolts |
| J |
max.181 mm
|
Distance between attachment bolts |
| J |
min.162 mm
|
Distance between attachment bolts |
| L |
219 mm
|
Overall length |
| N |
18 mm
|
Diameter of attachment bolt hole |
| N1 |
27.5 mm
|
Length of attachment bolt hole |
| s1 |
29.2 mm
|
Distance from locking device side face to raceway centre |
|
Values specified for B1 and s1 are approximate and before the set screw is tightened (sleeve and inner ring bore at starting position).
|
THREADED HOLE
| RG |
1/4-28 UNF
|
Housing thread for the grease fitting |
| R1 |
4.5 mm
|
Axial position of the housing thread |
| Rα |
45 °
|
Angular position of the housing thread |
GREASE FITTING
| DN |
6.5 mm
|
Diameter of head sphere of grease fitting |
| SWN |
7 mm
|
Hexagonal key size for the grease fitting |
| GN |
1/4-28 SAE-LT
|
Thread of grease fitting |
DOWEL PINS
| J6 |
201 mm
|
Distance of dowel pins |
| J7 |
21 mm
|
Axial offset of dowel pins |
| N4 |
4 mm
|
Recommended diameter for dowel pins |
Calculation data
| Basic dynamic load rating |
C |
43.6 kN
|
| Basic static load rating |
C0 |
29 kN
|
| Fatigue load limit |
Pu |
1.25 kN
|
| Limiting speed |
|
3 600 r/min
|
Mounting information
| Set screw |
G2 |
M6
|
| Hexagonal key size for set screw |
|
3.05 mm
|
| Recommended tightening torque for set screw |
|
7.4 N·m
|
| Recommended diameter for attachment bolts, mm |
G |
16 mm
|
| Recommended diameter for attachment bolts, inch |
G |
0.625 in
|
