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NTN 21308CW33 is a 213 series spherical roller bearing with a 40 mm straight bore. It features a steel cage and an annular lube groove with three lube holes (W33) for effective lubrication. Designed for heavy radial loads and moderate axial loads in industrial machinery such as gearboxes, fans, and conveyors.
MODEL 21308CW33
$172.80 Each
Prices are subject to change
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Returnable: See conditions
B (in)
0.9055
Bore type
Round
Bore Type
Round
Cage material
Steel
Cage Material
Steel
Cage type
Pressed
Cage Type
Pressed
d (in)
1.5748
D (in)
3.5433
d0
0.1181 in
D1
2.9882 in
d1
2.0472 in
Da max
3.2087 in
da min
1.9094 in
Dynamic load rating
19800 lbf
Dynamic Load Rating
19800 lbf
e
0.26
Enclosure
Open
I.D.
40 mm
Limiting speed - grease
4900 RPM
Limiting Speed - Grease
4900 RPM
Limiting speed - oil
6400 RPM
Limiting Speed - Oil
6400 RPM
Material
Through Hardened Steel
O.D.
90 mm
Operating temperature range
-40 to 250 ºF
Operating Temperature Range
-40 to 250 °F
r (in)
0.0591
Radial internal clearance
CN
Radial Internal Clearance
CN
ras max
0.0591 in
Ring modification
Relube
Ring Modification
Relube
Series
213
Static load rating
20200 lbf
Static Load Rating
20200 lbf
Tolerance
JIS-0 RBEC-1
Type
Spherical Roller Bearing
W0
0.1378 in
Width
23 mm
Y0
2.50
Y1
2.55
Y2
3.80
Technical Specifications
Type | Spherical Roller Bearing |
Bore Type | Round |
Material | Through Hardened Steel |
Cage Type | Pressed |
Cage Material | Steel |
Limiting Speed - Oil | 6400 RPM |
Limiting Speed - Grease | 4900 RPM |
e | 0.26 |
Y1 | 2.55 |
Y2 | 3.80 |
Y0 | 2.50 |
Series | 213 |
Radial Internal Clearance | CN |
Ring Modification | Relube |
Tolerance | JIS-0 RBEC-1 |
Static Load Rating | 20200 lbf90000 N90.00 kN |
Dynamic Load Rating | 19800 lbf88000 N88.00 kN |
Enclosure | Open |
Weight | 1.554 lb0.705 kg |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 1.5748 in40.000 mm |
D | 3.5433 in90.000 mm |
B | 0.9055 in23.000 mm |
d1 | 2.0472 in52.000 mm |
D1 | 2.9882 in75.900 mm |
r | 0.0591 in1.500 mm |
W0 | 0.1378 in3.500 mm |
d0 | 0.1181 in3.000 mm |
da min | 1.9094 in48.500 mm |
Da max | 3.2087 in81.500 mm |
ras max | 0.0591 in1.500 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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