Plastic Molded Cage BSN4075-DT Super Precision Bearings For Ball Screw Support
The BSN4075-DT Ball screw support bearings are widely used in the feed drive systems of CNC machine tools, specifically including: machining centers (X/Y/Z axis screw support), CNC lathes (Z-axis), EDM machines, precision grinding machines, industrial robots (linear modules), and semiconductor equipment (wafer positioning platforms).
The BSN4075-DT bearing is a Double-Row Angular Contact Super Precision Thrust Ball Bearings, BSN Type Matched DT pairs for Ball Screw Support with an inner diameter of 40 mm , an outer diameter of 75 mm, a width of 68 mm. It typically uses P2B = ISO Class 2 grade precision tolerances and GCr15SiMn rings, GCr15SiMn rolling mlement. Its dynamic axial rated load is approximately 71556 N, its static axial rated load is approximately 175739 N. DDU = Rubber contact seal on both sides type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
BSN4075-DT bearings ( 40 mm x 75 mm x 68 mm) have the advantages of High axial stiffness and load-bearing capacity, 60° contact angle design, pre-installed and pre-loaded for easy installation, optional sealing for maintenance-free operation, and are therefore widely used in the Machine tool ball screws, machining centers, automated equipment, robots, precision measuring devices.
| Part Number | BSN4075-DT |
| Bearing Type | Double-Row Angular Contact Super Precision Thrust Ball Bearings, BSN Type Matched DT pairs for Ball Screw Support |
| Internal design | N = No flange |
| Contact angle - α | 60 ° |
| Type | BS = BSBD Series |
| Preload | H = Heavy preload |
| Arrangement row | Two |
| Arrangement | DT = Double row Tandem |
| Bearing Mass - m [lb] | 2.8660 |
| Starting Torque - H | 0.49 N･m |
| Recommended Clamping Force - T [lbf] | 3128 |
| Dynamic Axial - Ca [lbf] | 16085 |
| Static Axial - C0a [lbf] | 39506 |
| Limiting static axial load [lbf] | 26242 |
| Speed ratings (grease) - nB | 3473 min–1 |
| Axial Rigidity | 1840 N/µm |
| Dimension | |
| d φ Inside [inch] | 1.5748 |
| D Φ Outside [inch] | 2.9527 |
| 2B Total Width [inch] | 2.6772 |
| r min Chamfer [inch] | 0.0236 |
| r1 min Chamfer [inch] | 0.0236 |
| Abutment Dimensions | |
| Db max [inch] | 2.6378 |
| da min [inch] | 1.8110 |
The BSN4075-DT Ball screw support bearings are typically composed of high-precision angular contact ball bearings paired back-to-back (DB) or in series (DT) configurations. They feature a small contact angle (15° or 20°) and high-rigidity cages (phenolic resin or brass) on both inner and outer rings, achieving a precision grade of P4 or higher. Some models integrate seals and lubrication holes, forming a preload unit.
Ball screw support bearings offer extremely high axial rigidity and load-bearing capacity, accurately withstanding bidirectional axial loads in screw drives. The back-to-back configuration provides anti-overturning moment capability, ensuring positioning accuracy. The preload design eliminates axial backlash, achieving backlash-free, low-friction operation with low heat generation, making them suitable for high-speed feed. They are factory-installed and ready to use, simplifying installation and adjustment.
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