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NTN 7221CG/GNP4 single-row angular contact ball bearing with 105 mm straight bore, open enclosure, phenolic resin cage, and P4 precision class. High carbon chrome steel construction for high-speed, high-accuracy applications such as machine tool spindles and precision gearboxes.
MODEL 7221CG/GNP4
$2,088.47 Each
Prices are subject to change
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Returnable: See conditions
a (Load Center)
1.4961 in
B (in)
1.4173
Ball material
Steel
Ball Material
Steel
Bore type
Round
Bore Type
Round
Cage material
Phenolic resin
Cage Material
Phenolic Resin
Cage type
Machined
Cage Type
Machined
Configuration
One
Contact angle
15 º
D (in)
7.4803
d (in)
4.1339
Da max
7.0079 in
da min
4.6063 in
Db max
7.2047 in
Double Row Width
2.8346 in
Dynamic load rating
36500 lbf
Dynamic Load Rating
36500 lbf
Enclosure
Open
Factor
14.5
I.D.
105 mm
Limiting speed - grease
4900 RPM
Limiting Speed - Grease
4900 RPM
Limiting speed - oil
7300 RPM
Limiting Speed - Oil
7300 RPM
Material
High Carbon Chrome Steel
O.D.
190 mm
Operating temperature range
-40 to 250 ºF
Operating Temperature Range
-40 to 250 °F
Precision
ISO Class 4
Preload
Normal
Quadruple Row Width
5.6693 in
r (in)
0.0827
r1
0.0433 in
r1as max
0.0394 in
ras max
0.0787 in
Static load rating
32000 lbf
Static Load Rating
32000 lbf
Triple Row Width
4.2520 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 Resin |
Ball Material | Steel |
Limiting Speed - Oil | 7300 RPM |
Limiting Speed - Grease | 4900 RPM |
Precision | ISO Class 4 |
Configuration | One |
Preload | Normal |
Factor | 14.5 |
Static Load Rating | 32000 lbf143000 N143.00 kN |
Dynamic Load Rating | 36500 lbf162000 N162.00 kN |
Enclosure | Open |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 4.1339 in105.000 mm |
D | 7.4803 in190.000 mm |
B | 1.4173 in36.000 mm |
r | 0.0827 in2.100 mm |
r1 | 0.0433 in1.100 mm |
Contact Angle | 15 |
a (Load Center) | 1.4961 in38.000 mm |
da min | 4.6063 in117.000 mm |
Da max | 7.0079 in178.000 mm |
Db max | 7.2047 in183.000 mm |
ras max | 0.0787 in2.000 mm |
r1as max | 0.0394 in1.000 mm |
Double Row Width | 2.8346 in72.000 mm |
Triple Row Width | 4.2520 in108.000 mm |
Quadruple Row Width | 5.6693 in144.000 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.
| Brand | HubCity |
| Model | 0230-14850 |
