Plastic Molded Cage BSF50140DDUHP2B Angular Contact Super Precision Ball Bearings For Ball Screw Support
The BSF50140DDUHP2B 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 BSF50140DDUHP2B bearing is a Double-Row Angular Contact Super Precision Thrust Ball Bearings, BSF Type Single for Ball Screw Support with an inner diameter of 50 mm , an outer diameter of 140 mm, a width of 54 mm. It typically uses P2B = ISO Class 2 grade precision tolerances and GCr15SiMn rings, GCr15SiMn rolling mlement. Its dynamic axial rated load is approximately 115678 N, its static axial rated load is approximately 218769 N. DDU = Rubber contact seal on both sides type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
BSF50140DDUHP2B bearings ( 50 mm x 140 mm x 54 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 | BSF50140DDUHP2B |
| Bearing Type | Double-Row Angular Contact Super Precision Thrust Ball Bearings, BSF Type Single for Ball Screw Support |
| Internal design | F = Flange type |
| Type | BS = BSBD Series |
| Preload | H = Heavy preload |
| Bearing Mass - m [lb] | 9.8325 |
| Pitch Diameter of Holes for Bolts - J [inch] | 4.4488 |
| Extraction groove position - I [inch] | 1.7717 |
| Extraction groove position - b [inch] | 0.1181 |
| Number of bolts x Pitch - t (mm) | 12 x 30 ° |
| Bolt type | Ⅱ |
| Bolt Dia. | M10 |
| Number of Bolts | 12 |
| Starting Torque - H | 1.06 N･m |
| Recommended Clamping Force - T [lbf] | 4200 |
| Dynamic Axial - Ca [lbf] | 26004 |
| Static Axial - C0a [lbf] | 49179 |
| Limiting static axial load [lbf] | 33456 |
| Speed ratings (grease) - nB | 2463 min–1 |
| Preload [lbf] | 1671 |
| Axial Rigidity | 1389 N/µm |
| Dimension | |
| d φ Inside [inch] | 1.9685 |
| D Φ Outside [inch] | 5.5118 |
| B Width [inch] | 2.1260 |
| r min Chamfer [inch] | 0.0236 |
| r1 min Chamfer [inch] | 0.0236 |
| d1 Shoulder [inch] | 3.0748 |
| d2 Shoulder [inch] | 0.4331 |
| D1 Shoulder/Recess [inch] | 3.8386 |
The BSF50140DDUHP2B 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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