Machined Brass Cage 120TAC20FME44DBELP5A Super Precision Angular Contact Thrust Ball Bearings
The 120TAC20FME44DBELP5A Ultra-precision angular contact thrust ball bearings are designed for high-load, high-speed applications with stringent requirements for axial runout, and are widely used in precision machine tool spindles, ball screws, industrial robot joints, aero-engine accessory transmission systems, and high-precision centrifuges.
The 120TAC20FME44DBELP5A bearing is a Super Precision Angular Contact Thrust Ball Bearings, TAC F Series with an inner diameter of 120 mm , an outer diameter of 180 mm, a width of 72 mm. It typically uses P5A grade precision tolerances and Bearing steel (SUJ2) rings, Bearing steel (SUJ2) rolling mlement. Its dynamic axial rated load is approximately 98382 N, its static axial rated load is approximately 323799 N. together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
120TAC20FME44DBELP5A bearings ( 120 mm x 180 mm x 72 mm) have the advantages of perfect balance of rotational accuracy, speed and rigidity, and are therefore widely used in the Machine tools, ball screw, aerospace, medical equipment.
| Part Number | 120TAC20FME44DBELP5A |
| Interchangeable | NSK 120TAC20FME44DBELP5A |
| Contact Angle [°] | 50 |
| Bearing Type | Super Precision Angular Contact Thrust Ball Bearings, TAC F Series |
| Lubrication holes | E44 = Lubrication groove and lubrication holes on outer ring |
| Arrangement row | Two |
| Arrangement | DB = Back-to-back arrangement (<>) |
| Dimension series | 20F = For combination with NN30 series |
| Type | TAC |
| Bearing Mass - m [lb] | 5.7981 |
| Ca Dynamic Axial [lbf] | 22116 |
| C0a Static Axial [lbf] | 72790 |
| nB Speed ratings (grease) [rpm] | 2972 |
| nG Speed ratings (oil) [rpm] | 3278 |
| d φ Inside [inch] | 4.7244 |
| D Φ Outside [inch] | 7.0866 |
| T Inner Ring Width [inch] | 2.8346 |
| C Outer Ring Width [inch] | 1.4173 |
| W Oil Groove Width [inch] | 0.5512 |
| r min Chamfer [inch] | 0.0787 |
| r1 min Chamfer [inch] | 0.0394 |
| ra max Fillet Radius [inch] | 0.0787 |
| rb max Fillet Radius [inch] | 0.0394 |
| L Notch Width [inch] | 0.2362 |
| m Number of Holes | 4 |
| da Abutment Dimensions Shaft [inch] | 5.6693 |
| Da Abutment Dimensions Housing [inch] | 6.6142 |
| Pa Permissible Axial Load [lbf] | 10984 |
| Preload | EL = Extra light preload |
| Preload (EL) [lbf] | 221 |
| Axial Rigidity (EL) [N/µm] | 940 |
| Measured axial clearance (EL) [µm] | -5 |
The core design of ultra-precision angular contact thrust ball bearings lies in their large contact angle (typically 60°) and high-precision matching steel balls, which can simultaneously withstand heavy axial loads and radial loads. With optimized raceway geometry and cage, they achieve extremely low friction and high rigidity, ensuring that they maintain nanometer-level rotational accuracy and excellent axial positioning capability during high-speed operation.
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