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 suitable for applications where the direction of rotation is constant or alternating. It has an inner ring extended on both sides and is locked onto the shaft by tightening two set screws on the inner ring, making it easy to mount. The units are compliant with North American standards.
| Compliance with standard |
North American standard
|
| Purpose specific |
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 |
19.05 mm
|
Bore diameter |
|---|---|---|
| d1 |
≈ 28.2 mm
|
Shoulder diameter of inner ring |
| A |
34 mm
|
Base width |
| A1 |
20.802 mm
|
Top width |
| A5 |
18.5 mm
|
Standout of end cover |
| B |
31 mm
|
Width of inner ring |
| B1 |
31 mm
|
Overall bearing width |
| B4 |
4.5 mm
|
Distance from locking device side face to thread centre |
| H |
31.75 mm
|
Height of spherical seat centre |
| H1 |
11.91 mm
|
Foot height |
| H2 |
62.71 mm
|
Overall height |
| J |
95.25 mm
|
Distance between attachment bolts |
| J |
max. 104.775 mm
|
Distance between attachment bolts |
| J |
min. 85.725 mm
|
Distance between attachment bolts |
| L |
127 mm
|
Overall length |
| N |
12.7 mm
|
Diameter of attachment bolt hole |
| N1 |
19.05 mm
|
Length of attachment bolt hole |
| s1 |
18.3 mm
|
Distance from locking device side face to raceway centre |
| RG |
1/8-27 NPT
|
Housing thread for the grease fitting |
|---|---|---|
| R1 |
1.4 mm
|
Axial position of the housing thread |
| Rα |
45 °
|
Angular position of the housing thread |
| DN |
6.579 mm
|
Diameter of head sphere of grease fitting |
|---|---|---|
| SWN |
7.938 mm
|
Hexagonal key size for the grease fitting |
| GN |
1/4-28 SAE-LT
|
Thread of grease fitting |
| Basic dynamic load rating | C |
12.7 kN
|
|---|---|---|
| Basic static load rating | C0 |
6.55 kN
|
| Fatigue load limit | Pu |
0.28 kN
|
| Limiting speed |
8 500 r/min
|
|
|
Limiting speed with shaft tolerance h6
|
| Mass bearing unit |
0.58 kg
|
| Set screw | G2 |
1/4-28 UNF
|
|---|---|---|
| Hexagonal key size for set screw |
3.175 mm
|
|
| Recommended tightening torque for set screw |
4 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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