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NTN 51220 single direction thrust ball bearing with a 100 mm straight bore. Designed for axial loads in one direction, this bearing features a separable shaft and housing washer for easy mounting. Suitable for vertical shaft applications in machine tools, gearboxes, and industrial machinery.
MODEL 51220
$330.29 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)
5.9055
d (in)
3.9370
D1
4.0551 in
d1
5.9055 in
Da max
5.1181 in
da min
5.1181 in
Dynamic Load Rating
33000 lbf
Dynamic load rating
33000 lbf
Enclosure
Open
I.D.
100 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.
150 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
92000 lbf
Static load rating
92000 lbf
T (in)
1.4961
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 | 92000 lbf410000 N410.00 kN |
Dynamic Load Rating | 33000 lbf147000 N147.00 kN |
Enclosure | Open |
| 4.919 lb2.231 kg | |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 3.9370 in100.000 mm |
D1 | 4.0551 in103.000 mm |
d1 | 5.9055 in150.000 mm |
D | 5.9055 in150.000 mm |
T | 1.4961 in38.000 mm |
r | 0.0433 in1.100 mm |
da min | 5.1181 in130.000 mm |
Da max | 5.1181 in130.000 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.
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