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NTN 21311KW33 is a 213 series spherical roller bearing with a 55 mm straight bore. It features an open enclosure, brass cage, and W33 annular lube groove with three lubrication holes. Constructed from through hardened steel, it is designed for heavy-duty industrial applications such as gearboxes, conveyors, and vibrating screens.
MODEL 21311KW33
$265.01 Each
Prices are subject to change
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Returnable:No
B (in)
1.1417
Bore type
Tapered
Bore Type
Tapered
Cage material
Steel
Cage Material
Steel
Cage type
Machined
Cage Type
Machined
D (in)
4.7244
d (in)
2.1654
d0
0.1181 in
Da max
4.3307 in
da min
2.5591 in
e
0.25
Enclosure
Open
I.D.
55 mm
Material
Through Hardened Steel
O.D.
120 mm
r (in)
0.0787
Radial internal clearance
CN
Radial Internal Clearance
CN
Radial internal clearance specification
Normal
Radial Internal Clearance Specification
Normal
ras max
0.0787 in
Ring modification
Relube
Ring Modification
Relube
Series
213
Taper
1:12
Type
Spherical Roller Bearing
W0
0.4724 in
Y0
2.63
Y1
2.69
Y2
4.01
Technical Specifications
| Type | Spherical Roller Bearing |
|---|---|
| Bore Type | Tapered |
| Material | Through Hardened Steel |
| Cage Type | Machined |
| Cage Material | Brass |
| e | 0.25 |
| Y1 | 2.69 |
| Y2 | 4.01 |
| Y0 | 2.63 |
| Series | 213 |
| Radial Internal Clearance | CN |
| Radial Internal Clearance Specification | Normal |
| Ring Modification | Relube |
| Enclosure | Open |
Dimensional Specifications
| |
| d | 2.1654 in55.000 mm |
|---|---|
| D | 4.7244 in120.000 mm |
| B | 1.1417 in29.000 mm |
| r | 0.0787 in2.000 mm |
| W0 | 0.4724 in12.000 mm |
| d0 | 0.1181 in3.000 mm |
| da min | 2.5591 in65.000 mm |
| Da max | 4.3307 in110.000 mm |
| ras max | 0.0787 in2.000 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.
| Brand | US Motors |
| Model | FF75E2GS |
| Brand | Century |
| Model | H196ES |
