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NTN NU238 cylindrical roller bearing with a 190 mm straight bore. The NU design features no flanges on the outer ring, making it separable and able to accommodate axial expansion. Suitable for gearboxes, electric motors, and industrial machinery requiring free axial movement of the shaft.
MODEL NU238
$3,480.24 Each
Prices are subject to change
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B (in)
2.1654
Bore type
Round
Bore Type
Round
Cage material
High strength machined brass rivetless cage w/square holes
Cage Material
High Strength Machined Brass Rivetless Cage w/Square Holes
Configuration
One
D (in)
13.3858
d (in)
7.4803
Da max
12.7559 in
da min
8.1102 in
Db max
12.7559 in
db min
8.1102 in
Dynamic load rating
125000 lbf
Dynamic Load Rating
125000 lbf
Enclosure
Open
Fw
9.0945 in
I.D.
190 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.
340 mm
Oil hole
w/o Oil Hole
Oil Hole
w/o Oil Hole
Operating temperature range
-40 to 250 ºF
Operating Temperature Range
-40 to 250 °F
r (in)
0.1575
r1as max
0.1181 in
Radial internal clearance
CN
Radial Internal Clearance
CN
Static load rating
173000 lbf
Static Load Rating
173000 lbf
Tolerance
ISO Class 0 (RBEC 1)
Type
Cylindrical Roller Bearing
Technical Specifications
Type | Cylindrical Roller Bearing |
Bore Type | Round |
Material | Hardened Alloy Steel |
Cage Material | High Strength Machined Brass Rivetless Cage w/Square Holes |
Limiting Speed - Oil | 2200 RPM |
Limiting Speed - Grease | 1900 RPM |
Configuration | One |
Tolerance | ISO Class 0 (RBEC 1) |
Oil Hole | w/o Oil Hole |
Radial Internal Clearance | CN |
Static Load Rating | 173000 lbf770000 N770.00 kN |
Dynamic Load Rating | 125000 lbf555000 N555.00 kN |
Enclosure | Open |
Weight | 46.958 lb21.300 kg |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 7.4803 in190.000 mm |
D | 13.3858 in340.000 mm |
B | 2.1654 in55.000 mm |
Fw | 9.0945 in231.000 mm |
r | 0.1575 in4.000 mm |
da min | 8.1102 in206.000 mm |
db min | 8.1102 in206.000 mm |
Da max | 12.7559 in324.000 mm |
Db max | 12.7559 in324.000 mm |
r1as max | 0.1181 in3.000 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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