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NTN 21311C3 is a 213 series spherical roller bearing with a 55 mm straight bore. It features an open design, steel cage, and C3 clearance for thermal expansion. Suitable for moderate radial and axial loads in industrial gearboxes, fans, and conveyors.
MODEL 21311C3
$265.01 Each
Prices are subject to change
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Returnable:No
B (in)
1.1417
Bore Type
Round
Bore type
Round
Cage Material
Steel
Cage material
Steel
Cage Type
Pressed
Cage type
Pressed
D (in)
4.7244
d (in)
2.1654
Da max
4.3307 in
da min
2.5591 in
Dynamic Load Rating
32500 lbf
Dynamic load rating
32500 lbf
e
0.25
Enclosure
Open
I.D.
55 mm
Limiting Speed - Grease
3700 RPM
Limiting speed - grease
3700 RPM
Limiting Speed - Oil
4800 RPM
Limiting speed - oil
4800 RPM
Material
Through hardened steel
O.D.
120 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
r (in)
0.0787
Radial Internal Clearance
C3
Radial internal clearance
C3
ras max
0.0787 in
Ring Modification
Plain
Ring modification
Plain
Series
213
Static Load Rating
36500 lbf
Static load rating
36500 lbf
Tolerance
JIS-0 RBEC-1
Type
Spherical Roller Bearing
Y0
2.63
Y1
2.69
Y2
4.01
Technical Specifications
| Type | Spherical Roller Bearing |
|---|---|
| Bore Type | Round |
| Material | Through Hardened Steel |
| Cage Type | Pressed |
| Cage Material | Steel |
| Limiting Speed - Oil | 4800 RPM |
| Limiting Speed - Grease | 3700 RPM |
| e | 0.25 |
| Y1 | 2.69 |
| Y2 | 4.01 |
| Y0 | 2.63 |
| Series | 213 |
| Radial Internal Clearance | C3 |
| Ring Modification | Plain |
| Tolerance | JIS-0 RBEC-1 |
| Static Load Rating | 36500 lbf163000 N163.00 kN |
| Dynamic Load Rating | 32500 lbf145000 N145.00 kN |
| Enclosure | Open |
| Operating Temperature Range | -40 to 250 F-40 to 120 C |
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 |
| 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.
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