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NTN NA4903R is a machined ring needle roller bearing with a 17 mm bore. This open design features a steel cage and is made from high carbon chrome steel. It is suitable for applications requiring high radial load capacity in a compact cross-section.
MODEL NA4903R
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$53.73 Each
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Brand Minimum Order Quantity: 2
Typically Ships in: 1 day
Returnable:No
Bearing Type
Needle roller bearing
Cage
Steel
Enclosure
Open
Height
1.181
I.D.
17 mm
Length
1.181
Material
High carbon chrome steel
O.D.
30 mm
Width
0.5118
Technical Specifications
| Type | Needle Roller Bearing |
|---|---|
| Bore Type | Round |
| Material | High Carbon Chrome Steel |
| Cage Material | Steel |
| Limiting Speed - Oil | 18000 RPM |
| Limiting Speed - Grease | 12000 RPM |
| Precision | ISO Class 0 |
| Configuration | One |
| Enclosure | Open |
| Bearing Design | w/ Inner Ring |
| Oil Hole | w/ Oil Hole |
| Radial Internal Clearance | CN |
| Static Load Rating | 3300 lbf14600 N14.60 kN |
| Dynamic Load Rating | 2520 lbf11200 N11.20 kN |
| 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 |
| F | 0.8661 in22.000 mm |
| B | 0.5118 in13.000 mm |
| r | 0.0118 in0.300 mm |
| s | 0.0197 in0.500 mm |
| da min | 0.7480 in19.000 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.
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