Brass Cage TAC120-3M Angular Contact Super Precision Bearings For Ball Screw Support
The TAC120-3M 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 TAC120-3M bearing is a Angular Contact Super Precision Thrust Ball Bearings, TAC 03 Series for Ball Screw Support (High-Load Drive) with an inner diameter of 120 mm , an outer diameter of 300 mm, a width of 62 mm. It typically uses PN5D = Standard accuracy (ISO Class 5) grade precision tolerances and GCr15SiMn rings, GCr15SiMn rolling mlement. Open type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
TAC120-3M bearings ( 120 mm x 300 mm x 62 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 | TAC120-3M |
| Bearing Type | Angular Contact Super Precision Thrust Ball Bearings, TAC 03 Series for Ball Screw Support (High-Load Drive) |
| Internal design | D = Contact angle 55 ° |
| Contact angle - α | 55 ° |
| Type | TAC |
| Dimension series | 03 = 03 Series |
| Preload | EL = Extra light preload |
| Bearing Mass - m [lb] | 53.7922 |
| DB/DF Arrangement H preload [lbf] | 373 |
| DB/DF Arrangement H Axial Rigidity | 1099 N/µm |
| DB/DF Arrangement H Starting Torque | 0.24 N･m |
| DB/DF Arrangement H Measured Axial Clearance | -9 µm |
| Speed ratings (grease) - nB | 1276 min–1 |
| Speed ratings (oil) - nG | 1690 min–1 |
| Recommended Grease Quantities - CC | 336 g/brg |
| Dimension | |
| d φ Inside [inch] | 4.7244 |
| D Φ Outside [inch] | 11.8110 |
| B Width [inch] | 2.4409 |
| r min Chamfer [inch] | 0.1575 |
| r1 min Chamfer [inch] | 0.0591 |
| d1 Shoulder [inch] | 6.8622 |
| d2 Shoulder [inch] | 8.5197 |
| D1 Shoulder/Recess [inch] | 8.8031 |
| D2 Shoulder/Recess [inch] | 10.5630 |
| Dynamic Axial Capacity | |
| Ca 1 row [lbf] | 135968 |
| Ca 2 row [lbf] | 221333 |
| Ca 3 row [lbf] | 294451 |
| Ca 4 row [lbf] | 359606 |
| Ca 5 row [lbf] | 420277 |
| Static Axial Capacity | |
| C0a 1 row [lbf] | 178383 |
| C0a 2 row [lbf] | 357365 |
| C0a 3 row [lbf] | 534969 |
| C0a 4 row [lbf] | 719247 |
| C0a 5 row [lbf] | 887918 |
| Other Arrangement | 1 rows: DB(<>); DF(><) 2 rows: DT(<<); DFD(><<); DFF(>><<); DBD(<<>); DBB(<<>>) 3 rows: DFT(><<<); DFFD(>><<); DFFF(>>><<<); DBT(<<<>); DBBD(<<<>>); DBBB(<<<>>>) 4 rows: DFTD(><<<<); DFFT(>><<<<); DBTD(<<<<>); DBBT(<<<<>>) 5 rows: DFTT(><<<<<); DBTT(<<<<<>) |
The TAC120-3M 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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