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Super Precision Angular Contact Ball Bearings S71921 ACD/P4A

Super Precision Angular Contact Ball Bearings S71921 ACD/P4A

The S71921 ACD/P4A is a super precision angular contact ball bearing with a 105mm bore and 145mm outer diameter, crafted from durable chrome steel. It handles radial loads up to 12870 lbf and operates smoothly at speeds up to 7500 RPM.

Its sealed design keeps lubrication in and contaminants out, while the phenolic cage ensures quiet, long-lasting performance. The 25° contact angle provides excellent stability for angular loads.

This bearing is available with preload and matched arrangements, making it versatile for high-precision setups. Ideal for applications like machine tool spindles or high-speed robotics where accuracy is key.

Weighing 0.85kg, it’s robust yet manageable for its size. Compliant with P4 tolerance standards, it offers reliable performance in temperatures from -30°C to 110°C.

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Product Parameters

  • Part Number S71921 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 Sealed
  • 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 7500 rpm
  • Weight 0.85 kg
  • Price（$） 1563.255
Super Precision Angular Contact Ball Bearings S71921 ACD/P4A dimension drawing
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Features

Performance Features of S71921 ACD/P4A Bearing

S71921 ACD/P4A Bearing is designed with a 25° contact angle, optimising load distribution for angular contact applications.
The chrome steel rings and balls enhance durability, supporting dynamic radial loads up to 12870 lbf.

Its phenolic cage ensures smooth operation, reducing friction and noise during high-speed rotations.
With a maximum speed of 7,500 rpm, it maintains precision in demanding conditions.

The sealed design protects against contaminants, extending service life in harsh environments.
Preload availability further enhances stability, making it ideal for precision machinery.

S71921 ACD/P4A Bearing’s P4 tolerance class guarantees high accuracy, meeting ABEC-7 standards.
Its lubricated design minimises maintenance, ensuring long-term reliability.

Application

Where Is S71921 ACD/P4A Bearing Used?
S71921 ACD/P4A Bearing is commonly used in high-precision machine tools, where its angular contact design ensures accurate spindle rotation. The sealed construction helps maintain performance in environments with dust or debris.

In robotics, S71921 ACD/P4A Bearing supports articulated arms, providing smooth movement and long service life. Its phenolic cage reduces friction, making it ideal for repetitive motions.

For medical imaging devices, S71921 ACD/P4A Bearing’s P4 tolerance class ensures minimal vibration and noise. The chrome steel rings and balls offer reliable performance in critical applications.

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