Plastic Molded Cage 55TAC120CSUHPN7C Angular Contact Thrust Ball Bearings For Ball Screw Support
The 55TAC120CSUHPN7C 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 55TAC120CSUHPN7C bearing is a Angular Contact Super Precision Thrust Ball Bearings, TAC C Series Open type for Ball Screw Support (High-Rigidity) with an inner diameter of 55 mm , an outer diameter of 120 mm, a width of 20 mm. It typically uses PN7C = NES Class 7C (axial runout P2) grade precision tolerances and GCr15SiMn rings, GCr15SiMn rolling mlement. Open type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
55TAC120CSUHPN7C bearings ( 55 mm x 120 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 | 55TAC120CSUHPN7C |
| Bearing Type | Angular Contact Super Precision Thrust Ball Bearings, TAC C Series Open type for Ball Screw Support (High-Rigidity) |
| Internal design | C = Contact angle 60 ° |
| Contact angle - α | 60 ° |
| Type | TAC |
| Preload | H = Heavy preload |
| Arrangement row | One |
| Arrangement | SU = Universal (One-row) |
| SU Bearing Mass - m [lb] | 2.7117 |
| DB/DF Arrangement H preload [lbf] | 1214 |
| DB/DF Arrangement H Axial Rigidity | 1613 N/µm |
| DB/DF Arrangement H Starting Torque | 0.49 N･m |
| DB/DF Arrangement H Measured Axial Clearance | -19 µm |
| Speed ratings (grease) - nB | 2477 min–1 |
| Speed ratings (oil) - nG | 3459 min–1 |
| Recommended Grease Quantities - CC | 12 g/brg |
| Dimension | |
| d φ Inside [inch] | 2.1654 |
| D Φ Outside [inch] | 4.7244 |
| B Width [inch] | 0.7874 |
| r min Chamfer [inch] | 0.0394 |
| r1 min Chamfer [inch] | 0.0236 |
| Dynamic Axial Capacity | |
| Ca 1 row [lbf] | 15779 |
| Ca 2 row [lbf] | 25747 |
| Ca 3 row [lbf] | 34371 |
| Abutment Dimensions | |
| Db max [inch] | 4.4094 |
| da min [inch] | 2.4803 |
| Da max [inch] | 4.3701 |
| db min [inch] | 2.4803 |
| Static Axial Capacity | |
| C0a 1 row [lbf] | 27598 |
| C0a 2 row [lbf] | 55203 |
| C0a 3 row [lbf] | 83114 |
| Other Arrangement | 1 row: DB(<>): 55TAC120CDBHPN7C DF(><): 55TAC120CDFHPN7C 2 rows: DT(<<): 55TAC120CDTHPN7C DFD(><<): 55TAC120CDFDHPN7C DBD(<<>): 55TAC120CDBDHPN7C DFF(>><<): 55TAC120CDFFHPN7C DBB(<<>>): 55TAC120CDBBHPN7C 3 rows: DFT(><<<): 55TAC120CDFTHPN7C DBT(<<<>)55TAC120CDBTHPN7C |
The 55TAC120CSUHPN7C 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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