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NTN 51138 single direction thrust ball bearing with 190 mm straight bore. Separable design for easy installation, handling axial loads in one direction. Suitable for vertical shaft applications in machine tools, presses, and industrial gearboxes.
MODEL 51138
$1,029.45 Each
Prices are subject to change
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Returnable:No
Ball Material
Steel
Ball material
Steel
Bore Type
Round
Bore type
Round
Cage Material
Steel
Cage material
Steel
Cage Type
Pressed
Cage type
Pressed
Configuration
One
d (in)
7.4803
D (in)
9.4488
D1
7.5984 in
d1
9.3307 in
Da max
8.6614 in
da min
8.6614 in
Dynamic Load Rating
38000 lbf
Dynamic load rating
38000 lbf
Enclosure
Open
I.D.
190 mm
Limiting Speed - Grease
980 RPM
Limiting speed - grease
980 RPM
Limiting Speed - Oil
1400 RPM
Limiting speed - oil
1400 RPM
Material
High carbon chrome steel
O.D.
240 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Outside Ring Type
Straight
Precision
ISO class 0
r (in)
0.0433
Radial Internal Clearance
CN
Radial internal clearance
CN
ras max
0.0394 in
Seal material
None
Seal type
None
Static Load Rating
147000 lbf
Static load rating
147000 lbf
T (in)
1.4567
Type
Thrust Ball Bearing
Width
37 mm
Technical Specifications
Type | Thrust Ball Bearing |
|---|---|
Bore Type | Round |
Outside Ring Type | Straight |
Material | High Carbon Chrome Steel |
Cage Type | Pressed |
Cage Material | Steel |
Ball Material | Steel |
Limiting Speed - Oil | 1400 RPM |
Limiting Speed - Grease | 980 RPM |
Seal Type | None |
Seal Material | None |
Precision | ISO Class 0 |
Configuration | One |
Radial Internal Clearance | CN |
Static Load Rating | 147000 lbf655000 N655.00 kN |
Dynamic Load Rating | 38000 lbf170000 N170.00 kN |
Enclosure | Open |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 7.4803 in190.000 mm |
|---|---|
D1 | 7.5984 in193.000 mm |
d1 | 9.3307 in237.000 mm |
D | 9.4488 in240.000 mm |
T | 1.4567 in37.000 mm |
r | 0.0433 in1.100 mm |
da min | 8.6614 in220.000 mm |
Da max | 8.6614 in220.000 mm |
ras max | 0.0394 in1.000 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.
What is the difference between deep groove and angular contact ball bearings?
Deep groove ball bearings are the most common type. They’re designed to handle mainly radial loads, but they can also take some axial load in both directions. They’re simple, versatile, and used in everything from motors to conveyors. Angular contact ball bearings are built for combined loads, especially where there’s significant axial force in one direction. They’re often used in pairs and are common in higher precision or higher load applications like pumps and gearboxes. If your load is mostly radial, go deep groove. If axial load matters more, angular contact is usually the better choice.
#5032821
Brand
NSK Bearings
Model
51138
