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NTN 51240 single direction thrust ball bearing with a 200 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 machine tools, presses, and industrial gearboxes.
MODEL 51240
$2,634.55 Each
Prices are subject to change
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Ball material
Steel
Ball Material
Steel
Bore type
Round
Bore Type
Round
Cage material
Brass
Cage Material
Brass
Cage type
Machined
Cage Type
Machined
Configuration
One
D (in)
11.0236
d (in)
7.8740
D1
8.0315 in
d1
10.9055 in
Da max
9.7638 in
da min
9.7638 in
Dynamic load rating
71000 lbf
Dynamic Load Rating
71000 lbf
Enclosure
Open
I.D.
200 mm
Limiting speed - grease
700 RPM
Limiting Speed - Grease
700 RPM
Limiting speed - oil
990 RPM
Limiting Speed - Oil
990 RPM
Material
High Carbon Chrome Steel
O.D.
280 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)
0.0787
Radial internal clearance
CN
Radial Internal Clearance
CN
ras max
0.0787 in
Seal material
None
Seal type
None
Static load rating
250000 lbf
Static Load Rating
250000 lbf
T (in)
2.4409
Type
Thrust Ball Bearing
Technical Specifications
Type | Thrust Ball Bearing |
|---|---|
Bore Type | Round |
Outside Ring Type | Straight |
Material | High Carbon Chrome Steel |
Cage Type | Machined |
Cage Material | Brass |
Ball Material | Steel |
Limiting Speed - Oil | 990 RPM |
Limiting Speed - Grease | 700 RPM |
Seal Type | None |
Seal Material | None |
Precision | ISO Class 0 |
Configuration | One |
Radial Internal Clearance | CN |
Static Load Rating | 250000 lbf1110000 N1110.00 kN |
Dynamic Load Rating | 71000 lbf315000 N315.00 kN |
Enclosure | Open |
Weight | 26.015 lb11.800 kg |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 7.8740 in200.000 mm |
|---|---|
D1 | 8.0315 in204.000 mm |
d1 | 10.9055 in277.000 mm |
D | 11.0236 in280.000 mm |
T | 2.4409 in62.000 mm |
r | 0.0787 in2.000 mm |
da min | 9.7638 in248.000 mm |
Da max | 9.7638 in248.000 mm |
ras max | 0.0787 in2.000 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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