7021 ACD/HCP4ALTBTA
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
Ball & Washer Dimensions
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7021 ACD/HCP4ALTBTA Bearing Product Overview & Core Advantages
The 7021 ACD/HCP4ALTBTA is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and rigidity. This triplex matched set in a back-to-back (TBT) arrangement is engineered to handle combined loads with high stability. Its construction with a phenolic cage and ceramic balls enables superior high-speed performance and reduced rotational mass. Pre-lubricated and built to P4A tolerance class, this bearing offers reliable, long-lasting operation in precision machinery.
7021 ACD/HCP4ALTBTA Bearing Model Code Explained, Specifications & Naming Convention
- 7021: Basic bearing series, indicating bore diameter: 105 mm, outside diameter: 160 mm, and width: 78 mm
- ACD: Angular Contact Design with a 25° contact angle
- HCP4A: High Precision P4A tolerance class with extra light preload (Class A)
- L: Lubricated
- TB: Triplex Back-to-Back matched arrangement
- TA: Triplex arrangement code
7021 ACD/HCP4ALTBTA Bearing Structural Features & Performance Benefits
High Rigidity & Stability: The triplex back-to-back arrangement of three bearings creates an extremely rigid system that minimizes deflection under combined radial and axial loads, making it ideal for applications requiring precise shaft positioning.
Superior High-Speed Capability: The combination of ceramic balls (silicon nitride) and phenolic cage reduces rotating mass and provides excellent dimensional stability at high temperatures, enabling operation at limiting speeds up to 16,250 rpm.
Exceptional Precision: Manufactured to P4A tolerance class with tight dimensional controls (bore and OD tolerance: -0.004mm to 0), this bearing ensures minimal runout and vibration for precision applications.
Optimized Load Capacity: With a radial dynamic load rating of 44,775 lbf and radial static load rating of 61,875 lbf, this bearing set can handle significant loads while maintaining precision.
7021 ACD/HCP4ALTBTA Bearing Typical Application Areas
This high-precision bearing set is specifically designed for applications requiring maximum rigidity and accuracy:
- Machine tool spindles for high-speed milling and grinding operations
- Precision grinding machine spindles requiring minimal deflection
- High-speed machining centers demanding extreme accuracy
- Aerospace positioning systems requiring high rigidity and precision
- Medical equipment spindles for precision manufacturing
- Robotic arm joints requiring precise movement control
