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NTN 7811CG/GNP4 single-row angular contact ball bearing, 55 mm straight bore, open enclosure, phenolic cage, P4 precision class. Constructed from high carbon chrome steel for applications requiring accurate shaft positioning and minimal runout.
MODEL 7811CG/GNP4
$658.99 Each
Prices are subject to change
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Returnable:No
a (Load Center)
0.5118 in
B (in)
0.3543
Ball Material
Steel
Ball material
Steel
Bore Type
Round
Bore type
Round
Cage Material
Phenolic
Cage material
Phenolic
Cage Type
Machined
Cage type
Machined
Configuration
One
Contact angle
15 º
D (in)
2.8346
d (in)
2.1654
d1
2.3661 in
D2
2.7244 in
Da max
2.7362 in
da min
2.2638 in
Db max
2.7874 in
Double Row Width
0.7087 in
Dynamic Load Rating
2950 lbf
Dynamic load rating
2950 lbf
Enclosure
Open
Factor
16.4
I.D.
55 mm
Limiting Speed - Grease
13200 RPM
Limiting speed - grease
13200 RPM
Limiting Speed - Oil
17600 RPM
Limiting speed - oil
17600 RPM
Material
High carbon chrome steel
O.D.
72 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
ISO class 4
Preload
Normal
Quadruple Row Width
1.4173 in
r (in)
0.0118
r1
0.0059 in
r1as max
0.0059 in
ras max
0.0118 in
Static Load Rating
2860 lbf
Static load rating
2860 lbf
Triple Row Width
1.0630 in
Type
Angular Contact Ball Bearing
Technical Specifications
Type | Angular Contact Ball Bearing |
Bore Type | Round |
Material | High Carbon Chrome Steel |
Cage Type | Machined |
Cage Material | Phenolic |
Ball Material | Steel |
Limiting Speed - Oil | 17600 RPM |
Limiting Speed - Grease | 13200 RPM |
Precision | ISO Class 4 |
Configuration | One |
Preload | Normal |
Factor | 16.4 |
Static Load Rating | 2860 lbf12700 N12.70 kN |
Dynamic Load Rating | 2950 lbf13100 N13.10 kN |
Enclosure | Open |
Weight | 0.168 lb0.076 kg |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 2.1654 in55.000 mm |
D | 2.8346 in72.000 mm |
B | 0.3543 in9.000 mm |
r | 0.0118 in0.300 mm |
r1 | 0.0059 in0.150 mm |
Contact Angle | 15 |
a (Load Center) | 0.5118 in13.000 mm |
da min | 2.2638 in57.500 mm |
Da max | 2.7362 in69.500 mm |
Db max | 2.7874 in70.800 mm |
ras max | 0.0118 in0.300 mm |
r1as max | 0.0059 in0.150 mm |
d1 | 2.3661 in60.100 mm |
D2 | 2.7244 in69.200 mm |
Double Row Width | 0.7087 in18.000 mm |
Triple Row Width | 1.0630 in27.000 mm |
Quadruple Row Width | 1.4173 in36.000 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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