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The NTN 6903ZZNR is a 6900 series single-row deep groove ball bearing with a 17 mm bore. It features double steel shields (ZZ) and a snap ring groove with snap ring (NR) for axial location. This bearing is designed for general industrial applications requiring compact radial support.
MODEL 6903ZZNR
$20.55 Each
Prices are subject to change
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Returnable:No
a (in)
0.0512
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)
1.1811
d (in)
0.6693
D1
1.1299 in
D2
1.2913 in
da max
0.7874 in
Da max
1.1024 in
da min
0.748 in
Dynamic Load Rating
1158 lbf
Dynamic load rating
1158 lbf
Enclosure
Double Shielded
f (in)
0.0335
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
Static Load Rating
580 lbf
Static load rating
580 lbf
Type
Deep Groove Ball Bearing
Width
7 mm
Specifications
| Bearing Data Sheet | ||
|---|---|---|
| Single Row Deep Groove Ball Bearings | ||
| NTN Part Number | 6903 | |
| Dimensions | Features/Options | ||||
|---|---|---|---|---|---|
| Dimension | Imperial | Metric | Option | Code | Description |
| Bore d O.D.D. Width B or W rs min D1 max a max b min ro max rns min D2 max f max da min da max Da max ras max Dx min Cy max Cz min rnas max | 0.6693 (in) 1.1811 (in) 0.2756 (in) 0.0118 (in) 1.1299 (in) 0.0512 (in) 0.0374 (in) 0.0098 (in) 0.0118 (in) 1.2913 (in) 0.0335 (in) 0.7480 (in) 0.7874 (in) 1.1024 (in) 0.0118 (in) 1.3189 (in) 0.0748 (in) 0.0354 (in) 0.0118 (in) | 17.000 (mm) 30.000 (mm) 7.000 (mm) 0.300 (mm) 28.700 (mm) 1.300 (mm) 0.950 (mm) 0.250 (mm) 0.300 (mm) 32.800 (mm) 0.850 (mm) 19.000 (mm) 20.000 (mm) 28.000 (mm) 0.300 (mm) 33.500 (mm) 1.900 (mm) 0.900 (mm) 0.300 (mm) | Series Cage | 69 | Single Row Radial Ball Bearing 69 Series Pressed steel cage |
| Basic Load Ratings | Limiting Speeds | ||||
|---|---|---|---|---|---|
| Static Dynamic | 580 (LBF) 1, 050 (LBF) | 2, 580 (N) 4, 650 (N) | Oil Seals Grease | 26, 000.00 (RPM) N/A 22, 000.00 (RPM) | |
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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