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NTN NNU4944C3 double-row cylindrical roller bearing with 220 mm straight bore. NNU design features flanges on the inner ring, allowing axial shaft expansion. C3 clearance accommodates thermal expansion in heavy machinery, gearboxes, and industrial equipment.
MODEL NNU4944C3
$7,247.25 Each
Prices are subject to change
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Returnable:No
B (in)
3.1496
Bore Type
Cylindrical
Bore type
Cylindrical
C (in)
3.1496
Cage Material
High Strength, 2 piece, Machined Brass
Cage material
High strength, 2 piece, machined brass
Configuration
Two
d (in)
8.6614
D (in)
11.8110
Da max
11.378 in
da min
9.0945 in
Db max
11.3780 in
db min
9.3701 in
Db min
11.1811 in
Dynamic Load Rating
132000 lbf
Dynamic load rating
132000 lbf
Enclosure
Open
Fw
9.6457 in
I.D.
220 mm
Limiting Speed - Grease
1900 RPM
Limiting speed - grease
1900 RPM
Limiting Speed - Oil
2200 RPM
Limiting speed - oil
2200 RPM
Material
Hardened alloy steel
O.D.
300 mm
Oil Hole
w/o Oil Hole
Oil hole
w/o Oil Hole
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
ISO class 0
r (in)
0.0827
Radial Internal Clearance
C3
Radial internal clearance
C3
ras max
0.0787 in
Static Load Rating
292000 lbf
Static load rating
292000 lbf
Tolerance
ISO class 0 (RBEC 1)
Type
Cylindrical Roller Bearing
Width
80 mm
Technical Specifications
Type | Cylindrical Roller Bearing |
Bore Type | Cylindrical |
Material | Hardened Alloy Steel |
Cage Material | High Strength, 2 piece, Machined Brass |
Limiting Speed - Oil | 2200 RPM |
Limiting Speed - Grease | 1900 RPM |
Precision | ISO Class 0 |
Configuration | Two |
Tolerance | ISO Class 0 (RBEC 1) |
Oil Hole | w/o Oil Hole |
Radial Internal Clearance | C3 |
Static Load Rating | 292000 lbf1300000 N1300.00 kN |
Dynamic Load Rating | 132000 lbf585000 N585.00 kN |
Enclosure | Open |
Weight | 37.258 lb16.900 kg |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 8.6614 in220.000 mm |
D | 11.8110 in300.000 mm |
B | 3.1496 in80.000 mm |
C | 3.1496 in80.000 mm |
Fw | 9.6457 in245.000 mm |
r | 0.0827 in2.100 mm |
da min | 9.0945 in231.000 mm |
db min | 9.3701 in238.000 mm |
Da max | 11.3780 in289.000 mm |
Db min | 11.1811 in284.000 mm |
Db max | 11.3780 in289.000 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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| Brand | Superlok |
| Model | SRPV1-F4N |
