50TAC03AT85SUC8PN5D Bore 50 Mm, High Precision Angular Contact Thrust Ball Bearings TAC 03 Series For Ball Screw Support
The 50TAC03AT85SUC8PN5D 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 50TAC03AT85SUC8PN5D bearing is a High precision Angular Contact Thrust Ball Bearings TAC 03 Series for Ball Screw Support with an inner diameter of 50 mm , an outer diameter of 110 mm, a width of 27 mm. It typically uses PN5D = (ISO Class 5) grade precision tolerances and GCr15SiMn rings, GCr15SiMn rolling mlement. open type type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
50TAC03AT85SUC8PN5D bearings ( 50 mm x 110 mm x 27 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 | 50TAC03AT85SUC8PN5D |
| Bearing Type | High precision Angular Contact Thrust Ball Bearings TAC 03 Series for Ball Screw Support |
| Application | Electric Injection Molding Machines |
| Interchangeable | NSK 50TAC03AT85SUC8PN5D |
| Internal design | A |
| Design | TAC |
| Dimension series | 03 = 03 series |
| Preload | C8 = standard preload |
| Arrangement row | One |
| Series | TAC 03 series (..TAC03AT85SUC8PN5D) |
| Rows NO. | One |
| Arrangement | SU = universal (single row) |
| Cage | T85 = polyamide resin cage |
| Seal | open type |
| Accuracy class | PN5D = (ISO Class 5) |
| Dimension and weight | |
| Inside - d φ [inch] | 1.9685 |
| Outside - D Φ [inch] | 4.3307 |
| Width - B [inch] | 1.0630 |
| Chamfer - r min [inch] | 0.0787 |
| Chamfer - r1 min [inch] | 0.0394 |
| d1 [inch] | 2.3740 |
| d2 [inch] | 2.9764 |
| D1 [inch] | 3.3268 |
| D2 [inch] | 3.9724 |
| Contact angle - α [°] | 50 |
| Dynamic Axial SU - Ca [lbf] | 33575 |
| Limiting Axial Load SU [lbf] | 25650 |
| Speed ratings (grease) - nB [min–1] | 2429 |
| Speed ratings (oil) - nG [min–1] | 3226 |
| Other Arrangement | DB(<>): 50TAC03AT85DBC8PN5D DF(><): 50TAC03AT85DFC8PN5D DT(<<): 50TAC03AT85DTC8PN5D DFD(>><): 50TAC03AT85DFDC8PN5D DBD(<<>): 50TAC03AT85DBDC8PN5D DTD(<<<): 50TAC03AT85DTDC8PN5D DFF(>><<): 50TAC03AT85DFFC8PN5D DBB(<<>>): 50TAC03AT85DBBC8PN5D DFT(>>><): 50TAC03AT85DFTC8PN5D DBT(<<<>): 50TAC03AT85DBTC8PN5D |
The 50TAC03AT85SUC8PN5D 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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