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NTN 7020DB/GNP5 is a duplex angular contact ball bearing with a 100 mm straight bore, arranged back-to-back (DB) for increased rigidity and moment load capacity. It features a brass cage, open enclosure, and P5 precision class. Constructed from high carbon chrome steel, this bearing is suitable for machine tool spindles and high-speed applications requiring axial and radial load support.
MODEL 7020DB/GNP5
$1,894.28 Each
Prices are subject to change
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2B
1.8898 in
B (in)
0.9449
Ball Material
Steel
Ball material
Steel
Bore Type
Round
Bore type
Round
Cage Material
Brass
Cage material
Brass
Cage Type
High Strength, 2 piece, Machined
Cage type
High strength, 2 piece, machined
Configuration
Two
Contact angle
30 º
d (in)
3.9370
D (in)
5.9055
D1
5.2441 in
d1
4.6024 in
D2
5.5512 in
d2
4.4488 in
Da max
5.5709 in
da min
4.2717 in
Db max
5.6890 in
Enclosure
Open
I.D.
100 mm
Limiting Speed - Grease
5520 RPM
Limiting speed - grease
5520 RPM
Limiting Speed - Oil
7520 RPM
Limiting speed - oil
7520 RPM
Material
High carbon chrome steel
O.D.
150 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
ISO Class 5
Preload
Normal
r (in)
0.0591
r1
0.0394 in
r1as max
0.0394 in
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 | High Strength, 2 piece, Machined |
Cage Material | Brass |
Ball Material | Steel |
Limiting Speed - Oil | 7520 RPM |
Limiting Speed - Grease | 5520 RPM |
Precision | ISO Class 5 |
Configuration | Two |
Preload | Normal |
Enclosure | Open |
Weight | 6.482 lb2.940 kg |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 3.9370 in100.000 mm |
D | 5.9055 in150.000 mm |
B | 0.9449 in24.000 mm |
2B | 1.8898 in48.000 mm |
d1 | 4.6024 in116.900 mm |
d2 | 4.4488 in113.000 mm |
D1 | 5.2441 in133.200 mm |
D2 | 5.5512 in141.000 mm |
r | 0.0591 in1.500 mm |
r1 | 0.0394 in1.000 mm |
Contact Angle | 30 |
da min | 4.2717 in108.500 mm |
Da max | 5.5709 in141.500 mm |
Db max | 5.6890 in144.500 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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