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NTN BST50X100-1BDTFTP4 quadruple-row angular contact thrust ball bearing for ball screws, 50 mm bore. DTFT arrangement (two rows bear axial load in each direction), open type, P4 precision class. Designed for high-speed, high-precision ball screw support applications.
MODEL BST50X100-1BDTFTP4
$1,490.64 Each
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4B
3.1496 in
B (in)
0.7874
Bore Type
Round
Bore type
Round
Cage Material
Resin
Cage material
Resin
Cage Type
Molded
Cage type
Molded
Configuration
Four
Contact angle
60 º
d (in)
1.9685
D (in)
3.9370
d1
2.9843 in
D1
3.3937 in
d2
2.7598 in
D2
3.6457 in
Dynamic Load Rating
22700 lbf
Dynamic load rating
22700 lbf
Enclosure
Open
I.D.
50 mm
Material
High carbon chrome steel
O.D.
100 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
68500 lbf
Static load rating
68500 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 | Four |
Static Load Rating | 68500 lbf305000 N305.00 kN |
Dynamic Load Rating | 22700 lbf101000 N101.00 kN |
Enclosure | Open |
| 6.415 lb2.910 kg | |
Operating Temperature Range | -40 to 250 F-40 to 120 C |
Dimensional Specifications
| |
d | 1.9685 in50.000 mm |
D | 3.9370 in100.000 mm |
B | 0.7874 in20.000 mm |
4B | 3.1496 in80.000 mm |
d1 | 2.9843 in75.800 mm |
d2 | 2.7598 in70.100 mm |
D1 | 3.3937 in86.200 mm |
D2 | 3.6457 in92.600 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.
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