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Rollway 30311 A 55 mm Bore Size, 120 mm Outside Diameter, Radial Tapered Roller Bearing, Metric, High Chromium Bearing Steel, Normal Radial Clearance 55 mm Bore Size, 120 mm Outside Diameter, Radial Tapered Roller Bearing, Metric, High Chromium Bearing Steel, Normal Radial Clearance
MODEL 30311 A
Contact supplier for technical support on: 800-626-2120
$115.89 Each
Prices are subject to change
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Typically Ships in: 1 day
Returnable:No
Bore Size (mm)
55
Bore Type
Straight
Cage Material
Steel
Duplexing
No
Dynamic Load Rating (kN)
153.3
Dynamic Load Rating (lb)
34463
Full Complement/Caged
Caged
Height
1.5
Length
5.3
Material
High Chromium Bearing Steel
Misalignment
No
Number of Rows
1
O.D. (mm)
120
Overall Width (mm)
31.5
Platform
Tapered Radial Roller
Radial Clearance
Normal
Rolling Element
Tapered Roller
Seal Type
Unsealed
Sealed
None
Speed [Max] Grease (RPM)
3200
Speed [Max] Oil (RPM)
4300
Static Load Rating (kN)
187.6
Static Load Rating (lb)
42174
Version
A - Increased load capacity
Width
5.2
| Version | A - Increased load capacity |
|---|---|
| Bore (mm) | 55 |
| Sale Qty Multiple: | 1 |
|---|---|
| Packaged Length: | 5.12 |
| Packaged Width: | 5.12 |
| Packaged Height: | 1.38 |
| No. Links/Ft. : | 0 |
| Version: | A - Increased load capacity |
| Bore (mm): | 55 |
Dimensions
| Part No | 30311 A |
|---|---|
| Description | 30311 A |
| d | 55mm (2.1654 inch) |
| D | 120mm (4.7244 inch) |
| T | 31.5mm (1.2402 inch) |
| B | 29mm (1.1417 inch) |
| C | 25mm (0.9843 inch) |
| r1, 2 | 2.5mm (0.0984 inch) |
| r3, 4 | 2mm (0.0787 inch) |
| r5 | 0.6mm (0.0236 inch) |
| a | 24mm (0.9449 inch) |
| e | 0.35mm (0.0138 inch) |
| Y | 1.7mm (0.0669 inch) |
| Y0 | 0.9mm (0.0354 inch) |
| Basic Dynamic Rating Cr | 153.3kN (34, 463 pounds) |
| Basic Static Rating Cor | 187.6kN (42, 174 pounds) |
| Limiting Speed Grease (RPM) | 3, 200 |
| Limiting Speed Oil (RPM) | 4, 300 |
How do I choose the right type of bearing for my application?
Start with the load and how it’s applied. You need to know if you’re dealing with radial loads, axial loads, or a mix of both. Then look at speed, operating environment, and space constraints. For example, ball bearings are great for high speed and lighter loads, while roller bearings handle heavier loads but usually at lower speeds. If there’s contamination, moisture, or heat involved, you may need sealed bearings or specific materials. In most cases, the right choice comes down to matching load type, speed, and environment to the bearing design.
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