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The NTN 6944C3 is a single-row deep groove ball bearing with a 220 mm bore. It features an open design with a brass cage and is constructed from high carbon chrome steel. This bearing is suitable for high-speed radial load applications in industrial machinery.
MODEL 6944C3
$4,358.70 Each
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Axial Static Load Rating
40466 lbf
Axial static load rating
40466 lbf
B (in)
1.4960
Ball Material
Through Hardened Steel
Ball material
Through hardened steel
Bore Type
0
Bore type
0
Cage Material
Pressed Steel
Cage material
Pressed steel
Cage Type
High Strength, 2 piece, Machined
Cage type
High strength, 2 piece, machined
Clearance
C3
Configuration
One
D (in)
11.8110
d (in)
8.6610
Da max
11.378 in
da min
9.0945 in
Dynamic Load Rating
40018 lbf
Dynamic load rating
40018 lbf
Enclosure
Open
Factor
16.4
I.D.
220 mm
Limiting Speed - Grease
2000 RPM
Limiting speed - grease
2000 RPM
Limiting Speed - Oil
2300 RPM
Limiting speed - oil
2300 RPM
Material
High carbon chrome steel
O.D.
300 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Outside Ring Type
0
Precision
ISO class 0
r (in)
0.0827
Radial Dynamic Load Rating
40016 lbf
Radial Internal Clearance
0
Radial internal clearance
0
ras max
0.0787 in
Static Load Rating
40468 lbf
Static load rating
40468 lbf
Type
Deep Groove Ball Bearing
Width
1.4961
Technical Specifications
Type | Deep Groove 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 | 2300 RPM |
Limiting Speed - Grease | 2000 RPM |
Precision | Class 0 |
Configuration | One |
Factor | 16.4 |
Radial Internal Clearance | C3 |
Static Load Rating | 40500 lbf180000 N180.00 kN |
Dynamic Load Rating | 36000 lbf160000 N160.00 kN |
Enclosure | Open |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 8.6614 in220.000 mm |
D | 11.8110 in300.000 mm |
B | 1.4961 in38.000 mm |
r | 0.0827 in2.100 mm |
da min | 9.0945 in231.000 mm |
Da max | 11.3780 in289.000 mm |
ras max | 0.0787 in2.000 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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