40TAC90BDDGDFDC9PN7A Bore 40 Mm, High Precision Angular Contact Thrust Ball Bearings TAC B Series For Ball Screw Support
The 40TAC90BDDGDFDC9PN7A 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 40TAC90BDDGDFDC9PN7A bearing is a High precision Angular Contact Thrust Ball Bearings TAC B Series for Ball Screw Support with an inner diameter of 40 mm , an outer diameter of 90 mm, a width of 20 mm. It typically uses PN7A = ISO Class 4 grade precision tolerances and GCr15SiMn rings, GCr15SiMn rolling mlement. DDG = contact rubber seal type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
40TAC90BDDGDFDC9PN7A bearings ( 40 mm x 90 mm x 20 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 | 40TAC90BDDGDFDC9PN7A |
| Bearing Type | High precision Angular Contact Thrust Ball Bearings TAC B Series for Ball Screw Support |
| Application | Machine Tool |
| Interchangeable | NSK 40TAC90BDDGDFDC9PN7A |
| Internal design | B |
| Design | TAC |
| Preload | C9 = light preload |
| Arrangement row | Three |
| Series | TAC B series (..TAC..BDDGDFDC9PN7A) |
| Rows NO. | One |
| Arrangement | DFD = Triplex set (>><) |
| Cage | molded polyamide resin cage |
| Seal | DDG = contact rubber seal |
| Accuracy class | PN7A = ISO Class 4 |
| Dimension and weight | |
| Inside - d φ [inch] | 1.5748 |
| Outside - D Φ [inch] | 3.5433 |
| Width - B [inch] | 0.7874 |
| Chamfer - r min [inch] | 0.0394 |
| Chamfer - r1 min [inch] | 0.0236 |
| d1 [inch] | 2.1260 |
| d2 [inch] | 2.5197 |
| D1 [inch] | 2.7559 |
| D2 [inch] | 3.1260 |
| Contact angle - α [°] | 60 |
| DFD Bearing Mass - m [lb] | 4.4577 |
| Dynamic Axial DFD - Ca [lbf] | 21122 |
| Limiting Axial Load DFD [lbf] | 39976 |
| Speed ratings (grease) - nB [min–1] | 2912 |
The 40TAC90BDDGDFDC9PN7A 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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