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NTN NA5904 is a machined ring needle roller bearing with a 20 mm bore. This open design features a steel cage and high carbon chrome steel construction. The NA series includes an inner ring for shaft mounting, making it suitable for compact radial load applications in gearboxes, pumps, and industrial machinery.
MODEL NA5904
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$56.76 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
1.457
I.D.
20 mm
Length
1.457
Material
High carbon chrome steel
O.D.
37 mm
Width
0.9055
Technical Specifications
Type | Needle Roller Bearing |
Bore Type | Round |
Material | High Carbon Chrome Steel |
Cage Material | Steel |
Limiting Speed - Oil | 16000 RPM |
Limiting Speed - Grease | 11000 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 | 8300 lbf37000 N37.00 kN |
Dynamic Load Rating | 6400 lbf28400 N28.40 kN |
Weight | 0.254 lb0.115 kg |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 0.7874 in20.000 mm |
D | 1.4567 in37.000 mm |
F | 0.9843 in25.000 mm |
B | 0.9055 in23.000 mm |
r | 0.0118 in0.300 mm |
s | 0.0315 in0.800 mm |
da min | 0.8661 in22.000 mm |
Da max | 1.3780 in35.000 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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