Plastic Molded Cage BSF40100-DT Angular Contact Super Precision Bearings For Ball Screw Support
The BSF40100-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 BSF40100-DT bearing is a Double-Row Angular Contact Super Precision Thrust Ball Bearings, BSF Type Matched DT pairs for Ball Screw Support with an inner diameter of 40 mm , an outer diameter of 100 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 71647 N, its static axial rated load is approximately 175633 N. DDU = Rubber contact seal on both sides type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
BSF40100-DT bearings ( 40 mm x 100 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 | BSF40100-DT |
| Bearing Type | Double-Row Angular Contact Super Precision Thrust Ball Bearings, BSF Type Matched DT pairs for Ball Screw Support |
| Internal design | F = Flange type |
| Type | BS = BSBD Series |
| Preload | H = Heavy preload |
| Arrangement row | Two |
| Arrangement | DT = Double row Tandem |
| Bearing Mass - m [lb] | 6.3492 |
| Pitch Diameter of Holes for Bolts - J [inch] | 3.1496 |
| Extraction groove position - I [inch] | 2.3228 |
| Extraction groove position - b [inch] | 0.1181 |
| Number of bolts x Pitch - t (mm) | 8 x 45 ° |
| Bolt type | Ⅰ |
| Bolt Dia. | M8 |
| Number of Bolts | 7 |
| Starting Torque - H | 0.49 N･m |
| Recommended Clamping Force - T [lbf] | 3125 |
| Dynamic Axial - Ca [lbf] | 16106 |
| Static Axial - C0a [lbf] | 39482 |
| Limiting static axial load [lbf] | 26217 |
| Speed ratings (grease) - nB | 3480 min–1 |
| Axial Rigidity | 1838 N/µm |
| Dimension | |
| d φ Inside [inch] | 1.5748 |
| D Φ Outside [inch] | 3.9370 |
| 2B Total Width [inch] | 2.6772 |
| r min Chamfer [inch] | 0.0236 |
| r1 min Chamfer [inch] | 0.0236 |
| d1 Shoulder [inch] | 2.1693 |
| d2 Shoulder [inch] | 0.3465 |
| D1 Shoulder/Recess [inch] | 2.6457 |
The BSF40100-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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