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The NTN 2A-BST40X90-1BDFTP4 is a ball screw support bearing with a 40 mm bore, open enclosure, and resin cage. This angular contact ball bearing features a DFT arrangement for duplex back-to-back mounting, providing high axial rigidity for precision ball screw applications. Constructed from high carbon chrome steel, it is rated to P4 precision class.
MODEL 2A-BST40X90-1BDFTP4
$1,591.08 Each
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3B
2.3622 in
B (in)
0.7874
Bore Type
Round
Bore type
Round
Cage Material
Resin
Cage material
Resin
Cage Type
Molded
Cage type
Molded
Configuration
Three
Contact angle
60 º
D (in)
3.5433
d (in)
1.5748
D1
2.9606 in
d1
2.5512 in
D2
3.2126 in
d2
2.3268 in
Dynamic Load Rating
21400 lbf
Dynamic load rating
21400 lbf
Enclosure
Open
I.D.
40 mm
Material
High carbon chrome steel
O.D.
90 mm
Operating Temperature Range
-40 to 250 °F
Operating temperature range
-40 to 250 ºF
Precision
ISO class 4
r (in)
0.0394
r1
0.0236 in
Static Load Rating
58500 lbf
Static load rating
58500 lbf
Type
Ball Screw Support Bearing
Technical Specifications
Type | Ball Screw Support Bearing |
|---|---|
Bore Type | Round |
Material | High Carbon Chrome Steel |
Cage Type | Molded |
Cage Material | Resin |
Precision | ISO Class 4 |
Configuration | Three |
Static Load Rating | 58500 lbf261000 N261.00 kN |
Dynamic Load Rating | 21400 lbf95000 N95.00 kN |
Enclosure | Open |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 1.5748 in40.000 mm |
|---|---|
D | 3.5433 in90.000 mm |
B | 0.7874 in20.000 mm |
3B | 2.3622 in60.000 mm |
d1 | 2.5512 in64.800 mm |
d2 | 2.3268 in59.100 mm |
D1 | 2.9606 in75.200 mm |
D2 | 3.2126 in81.600 mm |
r | 0.0394 in1.000 mm |
r1 | 0.0236 in0.600 mm |
Contact Angle | 60 |
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.
| Brand | MROSupply Fasteners |
| Model | FSTPCK-151148 |
| Brand | United Abrasives |
| Model | 77516 |
| Brand | MROSupply Fasteners |
| Model | FSTPCK-876322 |