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The NTN 6921ZZ is a single-row deep groove ball bearing with a 105 mm straight bore. It features double steel shields for protection against contaminants. This bearing is suitable for electric motors, pumps, and general rotating machinery applications.
MODEL 6921ZZ
$116.44 Each
Prices are subject to change
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Returnable:No
B (in)
0.7874
Ball Material
Steel
Ball material
Steel
Bore Type
Round
Bore type
Round
Cage Material
Steel
Cage material
Steel
Cage Type
Pressed
Cage type
Pressed
Configuration
One
d (in)
4.1339
D (in)
5.7087
da max
4.5276 in
Da max
5.4528 in
da min
4.3898 in
Dynamic Load Rating
10560 lbf
Dynamic load rating
10560 lbf
Enclosure
Double Shielded
Factor
16.5
I.D.
105 mm
Limiting Speed - Grease
4300 RPM
Limiting speed - grease
4300 RPM
Material
High carbon chrome steel
O.D.
145 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
ISO class 0
r (in)
0.0433
r1
0.0197 in
Radial Internal Clearance
CN
Radial internal clearance
CN
ras max
0.0394 in
Seal material
None
Seal type
None
Static Load Rating
9450 lbf
Static load rating
9450 lbf
Type
Deep Groove Ball Bearing
Technical Specifications
Type | Deep Groove Ball Bearing |
Bore Type | Round |
Material | High Carbon Chrome Steel |
Cage Type | Pressed |
Cage Material | Steel |
Ball Material | Steel |
Limiting Speed - Grease | 4300 RPM |
Seal Type | None |
Seal Material | None |
Precision | ISO Class 0 |
Configuration | One |
Factor | 16.5 |
Radial Internal Clearance | CN |
Static Load Rating | 9450 lbf42000 N42.00 kN |
Dynamic Load Rating | 9550 lbf42500 N42.50 kN |
Enclosure | Double Shielded |
Weight | 1.839 lb0.834 kg |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
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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