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The NTN 6903ZZ is a 6900 series single-row deep groove ball bearing with a 17 mm straight bore. It features double steel shields for protection against contaminants. This bearing is designed for high-speed applications such as electric motors, pumps, and power tools.
MODEL 6903ZZ
$4.04 Each
Prices are subject to change
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Returnable:No
B (in)
0.2756
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)
0.6693
D (in)
1.1811
da max
0.7874 in
Da max
1.1024 in
da min
0.748 in
Dynamic Load Rating
1150 lbf
Dynamic load rating
1150 lbf
Enclosure
Double Shielded
Factor
14.7
I.D.
17 mm
Limiting Speed - Grease
22000 RPM
Limiting speed - grease
22000 RPM
Material
High carbon chrome steel
O.D.
30 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
ISO class 0
r (in)
0.0118
r1
0.0118 in
Radial Internal Clearance
CN
Radial internal clearance
CN
ras max
0.0118 in
Seal material
None
Seal type
None
Static Load Rating
580 lbf
Static load rating
580 lbf
Type
Deep Groove Ball Bearing
Width
7 mm
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 | 22000 RPM |
Seal Type | None |
Seal Material | None |
Precision | ISO Class 0 |
Configuration | One |
Factor | 14.7 |
Radial Internal Clearance | CN |
Static Load Rating | 580 lbf2580 N2.58 kN |
Dynamic Load Rating | 1050 lbf4650 N4.65 kN |
Enclosure | Double Shielded |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 0.6693 in17.000 mm |
D | 1.1811 in30.000 mm |
B | 0.2756 in7.000 mm |
r | 0.0118 in0.300 mm |
r1 | 0.0118 in0.300 mm |
da min | 0.7480 in19.000 mm |
da max | 0.7874 in20.000 mm |
Da max | 1.1024 in28.000 mm |
ras max | 0.0118 in0.300 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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