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NTN 7211T1DBC4UP is a duplex angular contact ball bearing with a 55 mm straight bore, arranged back-to-back for increased rigidity and moment load capacity. It features an open enclosure, C4 clearance, and a stamped steel cage. This precision bearing is suitable for machine tool spindles and high-speed applications.
MODEL 7211T1DBC4UP
$734.26 Each
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2B
1.6535 in
B (in)
0.8268
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
Two
Contact angle
30 º
D (in)
3.9370
d (in)
2.1654
D1
3.3858 in
d1
2.7165 in
D2
3.6339 in
da min
2.5000 in
Db max
3.7205 in
Enclosure
Open
I.D.
55 mm
Material
High carbon chrome steel
O.D.
100 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
Special precision
r (in)
0.0591
r1
0.0394 in
r1as max
0.0394 in
Radial Internal Clearance
C4
Radial internal clearance
C4
ras max
0.0591 in
Type
Angular Contact Ball Bearing
Technical Specifications
Type | Angular Contact Ball Bearing |
Bore Type | Round |
Material | High Carbon Chrome Steel |
Cage Type | Fiber Glass Reinforced |
Cage Material | Nylon |
Ball Material | Steel |
Precision | Special Precision |
Configuration | Two |
Radial Internal Clearance | C4 |
Enclosure | Open |
Weight | 2.690 lb1.220 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 | 0.8268 in21.000 mm |
2B | 1.6535 in42.000 mm |
d1 | 2.7165 in69.000 mm |
D1 | 3.3858 in86.000 mm |
D2 | 3.6339 in92.300 mm |
r | 0.0591 in1.500 mm |
r1 | 0.0394 in1.000 mm |
Contact Angle | 30 |
da min | 2.5000 in63.500 mm |
Db max | 3.7205 in94.500 mm |
ras max | 0.0591 in1.500 mm |
r1as max | 0.0394 in1.000 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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