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NTN 51228 single direction thrust ball bearing with a 140 mm straight bore. Designed for axial loads in one direction, this bearing features a separable design for easy mounting and dismounting. Suitable for vertical shaft applications in gearboxes, clutches, and machine tool spindles.
MODEL 51228
$1,144.28 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)
7.8740
d (in)
5.5118
D1
5.6299 in
d1
7.7559 in
Da max
6.9291 in
da min
6.9291 in
Dynamic Load Rating
43500 lbf
Dynamic load rating
43500 lbf
Enclosure
Open
I.D.
140 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.
200 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)
0.0591
Radial Internal Clearance
CN
Radial internal clearance
CN
ras max
0.0591 in
Seal material
None
Seal type
None
Static Load Rating
134000 lbf
Static load rating
134000 lbf
T (in)
1.8110
Type
Thrust Ball Bearing
Width
46 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 | 134000 lbf595000 N595.00 kN |
Dynamic Load Rating | 43500 lbf193000 N193.00 kN |
Enclosure | Open |
Weight | 9.766 lb4.430 kg |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
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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