We never sell your data to third parties
NTN NA4911R is a machined ring needle roller bearing with a 55 mm bore and an inner ring. This NA series bearing is designed for high radial load capacity in compact spaces. It is an open bearing suitable for applications requiring precise roller guidance and high rigidity.
MODEL NA4911R
$115.10 Each
Prices are subject to change
FREE SHIPPING ON ORDERS OVER $100
Select Quantity
Typically Ships in: 1 day
Returnable:No
Height
3.15
I.D.
55 mm
Length
3.15
O.D.
80 mm
Width
0.9843
Technical Specifications
Type | Needle Roller Bearing |
|---|---|
Bore Type | Round |
Material | High Carbon Chrome Steel |
Cage Material | Steel |
Limiting Speed - Oil | 6500 RPM |
Limiting Speed - Grease | 4300 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 | 22400 lbf99500 N99.50 kN |
Dynamic Load Rating | 13200 lbf58500 N58.50 kN |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 2.1654 in55.000 mm |
|---|---|
D | 3.1496 in80.000 mm |
F | 2.4803 in63.000 mm |
B | 0.9843 in25.000 mm |
r | 0.0394 in1.000 mm |
s | 0.0591 in1.500 mm |
da min | 2.3622 in60.000 mm |
Da max | 2.9528 in75.000 mm |
ras max | 0.0394 in1.000 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.
