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Koyo 6903 is a 69 series single-row deep groove ball bearing with a 17 mm bore, 30 mm OD, and 7 mm width. Open type design for applications requiring low friction and high-speed operation. Suitable for electric motors, pumps, and general industrial machinery.
MODEL 6903
$30.68 Each
Prices are subject to change
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Ball Material
Steel
Bearing Type
Radial
Cage Type
Metal
Contact Angle
0
I.D.
17 mm
icNumber
7696809
Inch/Metric
Metric Bore
Inner Ring Width
7 mm
Locking Device
No Locking Device
Lubricant
Oil Preservative
Material
Steel
No. in Set
Single Bearing
O.D.
30 mm
O.D. Type
Straight
Origin
Single Row Radial
Outer Ring Width
7 mm
Precision
Standard
Precision Level
Standard (ABEC 1)
Rows of Balls
Single
Seal Type
Unsealed
Snap Ring
No Snap Ring
Width
7 mm
| Bearing No. |
6903
|
|
| Boundary dimensions(mm) | d |
17
|
| D |
30
|
|
| B |
7
|
|
| r(min) |
0.3
|
|
| Basic load ratings(kN) | Cr |
5.75
|
| C0r |
2.55
|
|
| Fatigue load limit(kN) | Cu |
0.130
|
| factor | f0 |
14.7
|
| Limiting speeds(min-1) | Grease lub. |
23000
|
| Oil lub. |
28000
|
|
| Mounting dimensions(mm) | da(min) |
19
|
| Da(max) |
28
|
|
| ra(max) |
0.3
|
|
| (Refer.)Mass(kg) |
0.018
|
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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