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NTN 5211NR double-row angular contact ball bearing with a 55 mm straight bore. Open type with snap ring groove for axial location. Steel cage and high carbon chrome steel construction. Designed for combined radial and axial loads in gearboxes, pumps, and industrial machinery.
MODEL 5211NR
$148.35 Each
Prices are subject to change
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Returnable:No
A (in)
0.1209
a (in)
2.3819
B (in)
1.3110
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)
3.9370
d (in)
2.1654
D1
3.7909 in
D2
4.1929 in
Da max
3.5827 in
da min
2.5197 in
Dynamic Load Rating
12600 lbf
Dynamic load rating
12600 lbf
Enclosure
Open
f (in)
0.1063
I.D.
55 mm
Limiting Speed - Grease
4300 RPM
Limiting speed - grease
4300 RPM
Limiting Speed - Oil
5600 RPM
Limiting speed - oil
5600 RPM
Material
High carbon chrome steel
O.D.
100 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Outside Ring Type
Straight
Precision
Class 0
r (in)
0.0591
Radial Internal Clearance
CN
Radial internal clearance
CN
ras max
0.0591 in
Static Load Rating
11000 lbf
Static load rating
11000 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 | 5600 RPM |
Limiting Speed - Grease | 4300 RPM |
Precision | Class 0 |
Configuration | Two |
Radial Internal Clearance | CN |
Static Load Rating | 11000 lbf49000 N49.00 kN |
Dynamic Load Rating | 12600 lbf56000 N56.00 kN |
Enclosure | Open |
Weight | 2.107 lb0.956 kg |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 2.1654 in55.000 mm |
D | 3.9370 in100.000 mm |
B | 1.3110 in33.300 mm |
A | 0.1209 in3.070 mm |
D2 | 4.1929 in106.500 mm |
D1 | 3.7909 in96.290 mm |
f | 0.1063 in2.700 mm |
r | 0.0591 in1.500 mm |
Contact Angle | 25 |
a | 2.3819 in60.500 mm |
da min | 2.5197 in64.000 mm |
Da max | 3.5827 in91.000 mm |
ras max | 0.0591 in1.500 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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