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. This variant is strong and stiff, and is suitable for applications with both constant and alternating directions of rotation. It has an inner ring extended on both sides and is locked onto the shaft by tightening a set screw on the inner ring, making it easy to mount.
| Compliance with standard |
JIS
|
| Purpose specific |
For material handling applications
|
| Material, housing |
Cast iron
|
| Sealing, bearing |
Seal and flinger on both sides
|
| Sealing type, bearing |
Contact, standard
|
| Sealing, unit |
Without
|
| Coating |
Without
|
| d |
28.575 mm
|
Bore diameter |
|---|---|---|
| d1 |
≈ 39.8 mm
|
Shoulder diameter of inner ring |
| A |
45 mm
|
Base width |
| A1 |
27 mm
|
Top width |
| B |
38.1 mm
|
Width of inner ring |
| B4 |
5.5 mm
|
Distance from locking device side face to thread centre |
| H |
42.9 mm
|
Height of spherical seat centre |
| H1 |
16.5 mm
|
Foot height |
| H2 |
83.5 mm
|
Overall height |
| J |
121 mm
|
Distance between attachment bolts |
| J |
max. 125 mm
|
Distance between attachment bolts |
| J |
min. 117 mm
|
Distance between attachment bolts |
| L |
165 mm
|
Overall length |
| N |
17 mm
|
Diameter of attachment bolt hole |
| N1 |
21 mm
|
Length of attachment bolt hole |
| s1 |
22.2 mm
|
Distance from locking device side face to raceway centre |
| RG |
1/4-28 UNF
|
Housing thread for the grease fitting |
|---|---|---|
| R1 |
1 mm
|
Axial position of the housing thread |
| Rα |
45 °
|
Angular position of the housing thread |
| DN |
6.6 mm
|
Diameter of head sphere of grease fitting |
|---|---|---|
| SWN |
7.94 mm
|
Hexagonal key size for the grease fitting |
| GN |
1/4-28 UNF
|
Thread of grease fitting |
| Basic dynamic load rating | C |
19.5 kN
|
|---|---|---|
| Basic static load rating | C0 |
11.4 kN
|
| Fatigue load limit | Pu |
0.48 kN
|
| Limiting speed |
5 000 r/min
|
|
|
Limiting speed with shaft tolerance h6
|
| Mass bearing unit |
1.25 kg
|
| Set screw | G2 |
1/4-28 UNF
|
|---|---|---|
| Hexagonal key size for set screw |
3.225 mm
|
|
| Recommended tightening torque for set screw |
4 N·m
|
|
| Recommended diameter for attachment bolts, mm | G |
14 mm
|
| Recommended diameter for attachment bolts, inch | G |
0.5625 in
|
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