Machined Brass Cage 75TAC20F Super Precision Angular Contact Thrust Ball Bearings
The 75TAC20F 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 75TAC20F bearing is a Super Precision Angular Contact Thrust Ball Bearings, TAC F Series with an inner diameter of 75 mm , an outer diameter of 115 mm, a width of 48 mm. Bearing steel (SUJ2) rings, Bearing steel (SUJ2) rolling mlement. Its dynamic axial rated load is approximately 46205 N, its static axial rated load is approximately 130811 N. together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
75TAC20F bearings ( 75 mm x 115 mm x 48 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 | 75TAC20F |
| Interchangeable | NSK 75TAC20F |
| Contact Angle [°] | 50 |
| Bearing Type | Super Precision Angular Contact Thrust Ball Bearings, TAC F Series |
| Dimension series | 20F = For combination with NN30 series |
| Type | TAC |
| Bearing Mass - m [lb] | 1.5807 |
| Ca Dynamic Axial [lbf] | 10386 |
| C0a Static Axial [lbf] | 29406 |
| nB Speed ratings (grease) [rpm] | 4658 |
| nG Speed ratings (oil) [rpm] | 5277 |
| d φ Inside [inch] | 2.9527 |
| D Φ Outside [inch] | 4.5276 |
| T Inner Ring Width [inch] | 1.8898 |
| C Outer Ring Width [inch] | 0.9449 |
| W Oil Groove Width [inch] | 0.3937 |
| r min Chamfer [inch] | 0.0433 |
| r1 min Chamfer [inch] | 0.0236 |
| ra max Fillet Radius [inch] | 0.0394 |
| rb max Fillet Radius [inch] | 0.0236 |
| L Notch Width [inch] | 0.1575 |
| m Number of Holes | 4 |
| da Abutment Dimensions Shaft [inch] | 3.6220 |
| Da Abutment Dimensions Housing [inch] | 4.2913 |
| Pa Permissible Axial Load [lbf] | 4683 |
| Preload (EL) [lbf] | 148 |
| Preload (L) [lbf] | 653 |
| Axial Rigidity (EL) [N/µm] | 647 |
| Axial Rigidity (L) [N/µm] | 1088 |
| Measured axial clearance (EL) [µm] | -5 |
| Measured axial clearance (L) [µm] | -15 |
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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