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NTN 51109 single direction thrust ball bearing with a 45 mm straight bore. Designed for axial loads in one direction, this bearing features a separable design for easy mounting and dismounting. Suitable for machine tool spindles, clutches, and vertical shaft applications.
MODEL 51109
$19.86 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)
1.7717
D (in)
2.5591
D1
1.8504 in
d1
2.5591 in
Da max
2.2441 in
da min
2.2441 in
Dynamic Load Rating
6250 lbf
Dynamic load rating
6250 lbf
Enclosure
Open
I.D.
45 mm
Limiting Speed - Grease
3200 RPM
Limiting speed - grease
3200 RPM
Limiting Speed - Oil
4600 RPM
Limiting speed - oil
4600 RPM
Material
High carbon chrome steel
O.D.
65 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)
0.0236
Radial Internal Clearance
CN
Radial internal clearance
CN
ras max
0.0236 in
Seal material
None
Seal type
None
Static Load Rating
15500 lbf
Static load rating
15500 lbf
T (in)
0.5512
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 | 4600 RPM |
Limiting Speed - Grease | 3200 RPM |
Seal Type | None |
Seal Material | None |
Precision | ISO Class 0 |
Configuration | One |
Radial Internal Clearance | CN |
Static Load Rating | 15500 lbf69000 N69.00 kN |
Dynamic Load Rating | 6250 lbf27900 N27.90 kN |
Enclosure | Open |
| 0.302 lb0.137 kg | |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 1.7717 in45.000 mm |
|---|---|
D1 | 1.8504 in47.000 mm |
d1 | 2.5591 in65.000 mm |
D | 2.5591 in65.000 mm |
T | 0.5512 in14.000 mm |
r | 0.0236 in0.600 mm |
da min | 2.2441 in57.000 mm |
Da max | 2.2441 in57.000 mm |
ras max | 0.0236 in0.600 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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