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Koyo 5311 double-row angular contact ball bearing with 55 mm bore, 120 mm OD, and 49.2 mm width. Open type design accommodates combined radial and axial loads in both directions. Suitable for pumps, compressors, and gearboxes.
MODEL 5311
$144.17 Each
Prices are subject to change
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Returnable:No
Bore
2.165 in / 55 mm
Brand
KOYO
Contact Angle
24 Degree
Flush Ground
No
Harmonized Tariff Code
8482.10.50.28
Inch - Metric
Metric
Internal Clearance
C0-Medium
Maximum Capacity / Filling Slot
No
Number of Bearings
1 (Single)
Number of Rows of Balls
Double Row
Outside Diameter
4.724 Inch / 120 Millimeter
Precision Class
ABEC 1 / ISO P0
Rolling Element
Ball Bearing
Snap Ring
No
Type
Angular Contact Ball Bearings
UNSPSC
31171531
Width
1.937 Inch / 49.2 Millimeter
| Bearing No. | 5311 | |
| Boundary dimensions(mm) | d | 55 |
| D | 120 | |
| B | 49.2 | |
| r(min) | 2 | |
| Basic load ratings(kN) | Cr | 138 |
| C0r | 85.1 | |
| Fatigue load limit(kN) | Cu | 4.40 |
| Limiting speeds(min-1) | Grease lub. | 3300 |
| Oil lub. | 4500 | |
| Load center spread(mm) | a | 61.6 |
| Mounting dimensions(mm) | da(min) | 65 |
| da(max) | - | |
| Da(max) | 110 | |
| ra(max) | 2 | |
| (Refer.)Mass(kg) | 2.30 |
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.
What is the difference between deep groove and angular contact ball bearings?
Deep groove ball bearings are the most common type. They’re designed to handle mainly radial loads, but they can also take some axial load in both directions. They’re simple, versatile, and used in everything from motors to conveyors. Angular contact ball bearings are built for combined loads, especially where there’s significant axial force in one direction. They’re often used in pairs and are common in higher precision or higher load applications like pumps and gearboxes. If your load is mostly radial, go deep groove. If axial load matters more, angular contact is usually the better choice.
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