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.
| Compliance with standard |
ISO
|
| Purpose specific |
For material handling applications, For air handling applications
|
| Material, housing |
Cast iron
|
| Sealing, bearing |
Seal and flinger on both sides
|
| Sealing type, bearing |
Contact, standard
|
| Sealing, unit |
Optional end cover
|
| Coating |
Without
|
| d |
25 mm
|
Bore diameter |
|---|---|---|
| d1 |
≈ 33.74 mm
|
Shoulder diameter of inner ring |
| d2 |
41.7 mm
|
Outside diameter of locking ring |
| A |
36 mm
|
Base width |
| A1 |
22 mm
|
Top width |
| A5 |
20.5 mm
|
Standout of end cover |
| B |
24 mm
|
Width of inner ring |
| B1 |
33.2 mm
|
Overall bearing width |
| H |
36.5 mm
|
Height of spherical seat centre |
| H1 |
16 mm
|
Foot height |
| H2 |
70 mm
|
Overall height |
| J |
102 mm
|
Distance between attachment bolts |
| J |
max. 110 mm
|
Distance between attachment bolts |
| J |
min. 94 mm
|
Distance between attachment bolts |
| L |
130 mm
|
Overall length |
| N |
11.5 mm
|
Diameter of attachment bolt hole |
| N1 |
19.5 mm
|
Length of attachment bolt hole |
| s1 |
21.2 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).
|
||
| RG |
1/4-28 UNF
|
Housing thread for the grease fitting |
|---|---|---|
| R1 |
2 mm
|
Axial position of the housing thread |
| Rα |
45 °
|
Angular position of the housing thread |
| 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 |
| J6 |
120 mm
|
Distance of dowel pins |
|---|---|---|
| J7 |
13 mm
|
Axial offset of dowel pins |
| N4 |
4 mm
|
Recommended diameter for dowel pins |
| Basic dynamic load rating | C |
14 kN
|
|---|---|---|
| Basic static load rating | C0 |
7.8 kN
|
| Fatigue load limit | Pu |
0.335 kN
|
| Limiting speed |
7 000 r/min
|
| Mass bearing unit |
0.72 kg
|
| Set screw | G2 |
M5
|
|---|---|---|
| Hexagonal key size for set screw |
2.54 mm
|
|
| Recommended tightening torque for set screw |
4.2 N·m
|
|
| Recommended diameter for attachment bolts, mm | G |
10 mm
|
| Recommended diameter for attachment bolts, inch | G |
0.375 in
|
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