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NTN BL311NR is a single-row deep groove ball bearing with a 55 mm straight bore. It features an open enclosure, a steel cage, and a snap ring groove for axial location. Constructed from high carbon chrome steel, this bearing is suitable for general industrial rotating equipment.
MODEL BL311NR
$158.88 Each
Prices are subject to change
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Returnable:No
a (in)
0.1598
B (in)
1.1417
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
One
D (in)
4.7244
d (in)
2.1654
D1
4.5358 in
D2
5.1063 in
Da max
2.9134 in
da max
2.9134 in
da min
2.5197 in
Dynamic Load Rating
21100 lbf
Dynamic load rating
21100 lbf
Enclosure
Open
f (in)
0.1110
I.D.
55 mm
Limiting Speed - Grease
5200 RPM
Limiting speed - grease
5200 RPM
Limiting Speed - Oil
6100 RPM
Limiting speed - oil
6100 RPM
Material
High carbon chrome steel
O.D.
120 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
ISO class 0
r (in)
0.0787
r1
0.0197 in
Radial Internal Clearance
CN
Radial internal clearance
CN
ras max
0.0787 in
Static Load Rating
15200 lbf
Static load rating
15200 lbf
Style
Maximum Capacity
Type
Deep Groove Ball Bearing
Technical Specifications
Type | Deep Groove Ball Bearing |
|---|---|
Bore Type | Round |
Material | High Carbon Chrome Steel |
Cage Type | Pressed |
Cage Material | Steel |
Ball Material | Steel |
Limiting Speed - Oil | 6100 RPM |
Limiting Speed - Grease | 5200 RPM |
Precision | ISO Class 0 |
Configuration | One |
Radial Internal Clearance | CN |
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 | 1.1417 in29.000 mm |
D1 | 4.5358 in115.210 mm |
D2 | 5.1063 in129.700 mm |
a | 0.1598 in4.060 mm |
f | 0.1110 in2.820 mm |
r | 0.0787 in2.000 mm |
r1 | 0.0197 in0.500 mm |
da min | 2.5197 in64.000 mm |
da max | 2.9134 in74.000 mm |
Da max | 2.9134 in74.000 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.
#317691
Brand
SKF Bearing
Model
311 NR
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Model
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