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Super Precision Angular Contact Ball Bearings 71921 ACD/P4A

Super Precision Angular Contact Ball Bearings 71921 ACD/P4A

The 71921 ACD/P4A is a super precision angular contact ball bearing with a 105mm bore and 145mm outer diameter, crafted from high-quality chrome steel. It handles radial loads up to 12870 lbf and operates smoothly at speeds up to 12000 RPM.

With a 25° contact angle and open design, it offers excellent performance for angular contact applications. The phenolic cage ensures durability and reduces friction during high-speed rotations.

This bearing is available with preload and matched arrangements, making it versatile for precision setups. Ideal for machine tools, spindles, or other high-precision machinery where accuracy is crucial.

Weighing 0.82kg, it’s robust yet manageable for its size. Compliant with P4 tolerance standards, it ensures reliable performance in temperatures from -30°C to 110°C.

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Product Parameters

  • Part Number 71921 ACD/P4A
  • Brand TFL
  • Interchangeable SKF
  • Bore Dia 105 mm
  • Bore Dia Tolerance -0.008mm to 0
  • Outer Dia 145 mm
  • Outer Dia Tolerance -0.009mm to 0
  • Width 20 mm
  • Width Tolerance -0.2mm to 0
  • Ball Dia 12.7 mm
  • Ball Qty 27
  • Contact Angle 25°
  • Tolerance Class P4 (ABEC-7)
  • System of Measurement Metric
  • Seal Type Open
  • Matched Arrangement Available
  • Preload Available
  • For Load Direction Angular Contact
  • Ring Material Chrome Steel
  • Ball Material Chrome Steel
  • Cage Material Phenolic
  • Dynamic Radial Load 12870 lbf
  • Static Radial Load 14738 lbf
  • Lubrication Lubricated
  • Temperature Range -30° to 110 °C
  • Max Speed 12000 rpm
  • Weight 0.82 kg
  • Price（$） 132.66
Super Precision Angular Contact Ball Bearings 71921 ACD/P4A dimension drawing
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Features

Performance Features of 71921 ACD/P4A Bearing

71921 ACD/P4A Bearing is crafted with a 25° contact angle, ideal for handling combined radial and axial loads.
Its chrome steel rings and balls ensure durability, while the phenolic cage reduces friction for smoother operation.
With a dynamic radial load capacity of 12870 lbf, it performs reliably in high-precision applications.
The P4 tolerance class guarantees exceptional accuracy, making it suitable for demanding machinery.

How Does 71921 ACD/P4A Bearing Achieve High-Speed Performance?

71921 ACD/P4A Bearing’s open design and phenolic cage allow it to reach speeds up to 12,000 rpm.
Its precision-ground chrome steel components minimise vibration, ensuring smooth operation even at high speeds.
The 25° contact angle distributes loads evenly, enhancing stability during rapid rotation.
Lubrication is optimised to reduce heat buildup, maintaining performance under continuous use.

Engineered for Precision: 71921 ACD/P4A Bearing

71921 ACD/P4A Bearing meets ABEC-7 standards, offering unmatched accuracy for critical applications.
Its matched arrangement and preload options ensure consistent performance in paired setups.
The 27 high-grade chrome steel balls provide balanced load distribution and reduced wear.
With a static radial load capacity of 14738 lbf, it delivers reliability in precision engineering tasks.

Application

Key Fields for 71921 ACD/P4A Bearing
71921 ACD/P4A Bearing is commonly used in high-precision machine tools, where its 25° contact angle ensures accurate radial and axial load handling. The phenolic cage reduces friction, making it suitable for high-speed operations.

In aerospace applications, 71921 ACD/P4A Bearing supports components like helicopter transmissions, thanks to its P4 tolerance class. The chrome steel construction provides durability under demanding conditions.

For robotics, 71921 ACD/P4A Bearing excels in articulated arms, where smooth movement is essential. Its matched arrangement option allows for precise alignment in complex assemblies.

Where Is 71921 ACD/P4A Bearing Used?
You’ll find 71921 ACD/P4A Bearing in medical imaging devices, where its low vibration and high precision are crucial. The lubricated design ensures consistent performance over long periods.

In industrial automation, 71921 ACD/P4A Bearing is ideal for CNC spindles, handling both radial and axial loads effortlessly. The open seal type simplifies maintenance in dusty environments.

Built for Heavy-Duty Use: 71921 ACD/P4A Bearing
71921 ACD/P4A Bearing is a reliable choice for wind turbine gearboxes, where its dynamic radial load capacity shines. The temperature range of -30° to 110°C ensures performance in varied climates.

For electric vehicle motors, 71921 ACD/P4A Bearing offers smooth operation at high speeds. Its phenolic cage minimises wear, extending the bearing’s lifespan.

Automotive vs Aerospace: Applications of 71921 ACD/P4A Bearing
In automotive systems, 71921 ACD/P4A Bearing supports high-performance transmissions, handling angular loads with ease. The metric sizing ensures compatibility with global designs.

For aerospace, 71921 ACD/P4A Bearing is used in landing gear mechanisms, where precision and reliability are non-negotiable. The ABEC-7 tolerance guarantees consistent performance.

Q&A

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