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NTN 21310CW33C3 is a 213 series spherical roller bearing with a 50 mm straight bore, steel cage, and C3 clearance. Features an annular lube groove with three lube holes (W33) for effective lubrication. Open enclosure design for high-speed and heavy radial load applications in industrial gearboxes, fans, and conveying equipment.
MODEL 21310CW33C3
$212.27 Each
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B (in)
1.0630
Bore type
Round
Bore Type
Round
Cage material
Steel
Cage Material
Steel
Cage type
Pressed
Cage Type
Pressed
d (in)
1.9685
D (in)
4.3307
d0
0.1181 in
D1
3.6417 in
d1
2.5866 in
Da max
3.9370 in
da min
2.3622 in
Dynamic load rating
26500 lbf
Dynamic Load Rating
26500 lbf
e
0.26
Enclosure
Open
I.D.
50 mm
Limiting speed - grease
4000 RPM
Limiting Speed - Grease
4000 RPM
Limiting speed - oil
5200 RPM
Limiting Speed - Oil
5200 RPM
Material
Through Hardened Steel
O.D.
110 mm
Operating temperature range
-40 to 250 ºF
Operating Temperature Range
-40 to 250 °F
r (in)
0.0787
Radial internal clearance
C3
Radial Internal Clearance
C3
ras max
0.0787 in
Ring modification
Relube
Ring Modification
Relube
Series
213
Static load rating
28600 lbf
Static Load Rating
28600 lbf
Tolerance
JIS-0 RBEC-1
Type
Spherical Roller Bearing
Y0
2.58
Y1
2.64
Y2
3.93
Technical Specifications
Type | Spherical Roller Bearing |
Bore Type | Round |
Material | Through Hardened Steel |
Cage Type | Pressed |
Cage Material | Steel |
Limiting Speed - Oil | 5200 RPM |
Limiting Speed - Grease | 4000 RPM |
e | 0.26 |
Y1 | 2.64 |
Y2 | 3.93 |
Y0 | 2.58 |
Series | 213 |
Radial Internal Clearance | C3 |
Ring Modification | Relube |
Tolerance | JIS-0 RBEC-1 |
Static Load Rating | 28600 lbf127000 N127.00 kN |
Dynamic Load Rating | 26500 lbf118000 N118.00 kN |
Enclosure | Open |
Weight | 2.668 lb1.210 kg |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 1.9685 in50.000 mm |
D | 4.3307 in110.000 mm |
B | 1.0630 in27.000 mm |
d1 | 2.5866 in65.700 mm |
D1 | 3.6417 in92.500 mm |
r | 0.0787 in2.000 mm |
d0 | 0.1181 in3.000 mm |
da min | 2.3622 in60.000 mm |
Da max | 3.9370 in100.000 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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