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NTN 5311C3 double-row angular contact ball bearing with a 55 mm straight bore. Open enclosure, steel cage, and C3 clearance. Constructed from high carbon chrome steel for durability in moderate-speed, moderate-load applications such as pumps, compressors, and gearboxes.
MODEL 5311C3
$178.72 Each
Prices are subject to change
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Returnable:No
a (in)
2.8740
B (in)
1.9370
Ball Material
Steel
Ball material
Steel
Bore Type
Round
Bore type
Round
Cage Material
Steel
Cage material
Steel
Cage Type
Pressed
Cage type
Pressed
Configuration
Two
Contact angle
25 º
d (in)
2.1654
D (in)
4.7244
Da max
4.3307 in
da min
2.5591 in
Dynamic Load Rating
21400 lbf
Dynamic load rating
21400 lbf
Enclosure
Open
I.D.
55 mm
Limiting Speed - Grease
3800 RPM
Limiting speed - grease
3800 RPM
Limiting Speed - Oil
5000 RPM
Limiting speed - oil
5000 RPM
Material
High carbon chrome steel
O.D.
120 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Outside Ring Type
Straight
Precision
Class 0
r (in)
0.0787
Radial Internal Clearance
C3
Radial internal clearance
C3
ras max
0.0787 in
Static Load Rating
16400 lbf
Static load rating
16400 lbf
Type
Angular Contact Ball Bearing
Technical Specifications
| Type | Angular Contact Ball Bearing |
|---|---|
| Bore Type | Round |
| Outside Ring Type | Straight |
| Material | High Carbon Chrome Steel |
| Cage Type | Pressed |
| Cage Material | Steel |
| Ball Material | Steel |
| Limiting Speed - Oil | 5000 RPM |
| Limiting Speed - Grease | 3800 RPM |
| Precision | Class 0 |
| Configuration | Two |
| Radial Internal Clearance | C3 |
| Static Load Rating | 16400 lbf73000 N73.00 kN |
| Dynamic Load Rating | 21400 lbf95000 N95.00 kN |
| Enclosure | Open |
| Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
| d | 2.1654 in55.000 mm |
|---|---|
| D | 4.7244 in120.000 mm |
| B | 1.9370 in49.200 mm |
| r | 0.0787 in2.000 mm |
| Contact Angle | 25 |
| a | 2.8740 in73.000 mm |
| da min | 2.5591 in65.000 mm |
| Da max | 4.3307 in110.000 mm |
| ras max | 0.0787 in2.000 mm |
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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