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NTN 51315 single direction thrust ball bearing with a 75 mm straight bore. Designed for axial loads in one direction, this bearing features a separable design for easy installation. Suitable for vertical shaft applications, machine tools, and industrial gearboxes.
MODEL 51315
$130.14 Each
Prices are subject to change
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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)
2.9528
D (in)
5.3150
d1
5.3150 in
D1
3.0315 in
Da max
4.3701 in
da min
4.3701 in
Dynamic load rating
38500 lbf
Dynamic Load Rating
38500 lbf
Enclosure
Open
I.D.
75 mm
Limiting speed - grease
1300 RPM
Limiting Speed - Grease
1300 RPM
Limiting speed - oil
1800 RPM
Limiting Speed - Oil
1800 RPM
Material
High Carbon Chrome Steel
O.D.
135 mm
Operating temperature range
-40 to 250 ºF
Operating Temperature Range
-40 to 250 °F
Outside Ring Type
Straight
Precision
ISO Class 0
r (in)
0.0591
Radial internal clearance
CN
Radial Internal Clearance
CN
ras max
0.0591 in
Seal material
None
Seal type
None
Static load rating
89000 lbf
Static Load Rating
89000 lbf
T (in)
1.7323
Type
Thrust Ball Bearing
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 | 1800 RPM |
| Limiting Speed - Grease | 1300 RPM |
| Seal Type | None |
| Seal Material | None |
| Precision | ISO Class 0 |
| Configuration | One |
| Radial Internal Clearance | CN |
| Static Load Rating | 89000 lbf395000 N395.00 kN |
| Dynamic Load Rating | 38500 lbf171000 N171.00 kN |
| Enclosure | Open |
| Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
| d | 2.9528 in75.000 mm |
|---|---|
| D1 | 3.0315 in77.000 mm |
| d1 | 5.3150 in135.000 mm |
| D | 5.3150 in135.000 mm |
| T | 1.7323 in44.000 mm |
| r | 0.0591 in1.500 mm |
| da min | 4.3701 in111.000 mm |
| Da max | 4.3701 in111.000 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.
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.
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