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NTN 7911CG/GNP4 is a single-row angular contact ball bearing with a 55 mm straight bore. Part of the ULTAGE premium line, it features a machined brass cage and P4 precision class for high-speed, high-accuracy applications such as machine tool spindles and precision spindles.
MODEL 7911CG/GNP4
$529.83 Each
Prices are subject to change
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Returnable:No
a (Load Center)
0.6142 in
B (in)
0.5118
Ball Material
Steel
Ball material
Steel
Bore Type
Round
Bore type
Round
Cage Material
Nylon
Cage material
Nylon
Cage Type
Fiber Glass Reinforced
Cage type
Fiber glass reinforced
Configuration
One
Contact angle
15 º
d (in)
2.1654
D (in)
3.1496
d1
2.5079 in
D1
2.8110 in
d2
2.4331 in
D2
2.9567 in
Da max
2.9331 in
da min
2.3819 in
Db max
2.9724 in
Double Row Width
1.0236 in
Dynamic Load Rating
4450 lbf
Dynamic load rating
4450 lbf
Enclosure
Open
Factor
16.3
I.D.
55 mm
Limiting Speed - Grease
17400 RPM
Limiting speed - grease
17400 RPM
Limiting Speed - Oil
27800 RPM
Limiting speed - oil
27800 RPM
Material
High carbon chrome steel
O.D.
80 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
ISO class 4
Preload
Normal
Quadruple Row Width
2.0472 in
r (in)
0.0394
r1
0.0236 in
r1as max
0.0236 in
ras max
0.0394 in
Static Load Rating
4150 lbf
Static load rating
4150 lbf
Triple Row Width
1.5354 in
Type
Angular Contact Ball Bearing
Specifications
| Bearing Data Sheet | ||
|---|---|---|
| Single Row Angular Ball Bearings | ||
| NTN Part Number | 7911CG/GNP4 | |
| Dimensions | Features/Options | ||||
|---|---|---|---|---|---|
| Dimension | Imperial | Metric | Option | Code | Description |
| Bore d O.D.D. Width B or W rs min r1s min Load center a da min db min Da max Db max ras max r1as max | 2.1654 (in) 3.1496 (in) 0.5118 (in) 0.0394 (in) 0.0236 (in) 0.6102 (in) 2.3819 (in) 2.9331 (in) 2.9724 (in) 0.0394 (in) 0.0236 (in) | 55.000 (mm) 80.000 (mm) 13.000 (mm) 1.000 (mm) 0.600 (mm) 15.500 (mm) 60.500 (mm) 74.500 (mm) 75.500 (mm) 1.000 (mm) 0.600 (mm) | Series Contact Angle Cage Duplex Arrangement Preload Tolerance | 79 C G /GN P4 | 79 Angular Contact Series Contact Angle 15 Standard cage Single Bearings, flush ground universal mount Normal Preload ISO class 4 |
| Basic Load Ratings | Limiting Speeds | ||||
|---|---|---|---|---|---|
| Static Dynamic | 4, 000 (LBF) 4, 300 (LBF) | 17, 700 (N) 19, 100 (N) | | Oil Seals Grease | 16, 000.00 (RPM) N/A 12, 000.00 (RPM) |
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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