7021 ACD/P4ADBC
7000 Series Super Precision Angular Contact Ball Bearings
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7021 ACD/P4ADBC Bearing Product Overview & Core Advantages
The 7021 ACD/P4ADBC is a precision duplex angular contact ball bearing set, specifically designed for demanding applications requiring high rigidity and exceptional running accuracy. This back-to-back (DB) matched pair is preloaded to Moderate / Class C, providing superior system stability and resistance to complex combined loads (radial and axial). Manufactured to the exacting P4A tolerance class, it is an ideal choice for high-precision, high-speed spindles and machinery where uncompromising performance is critical.
7021 ACD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7021 | Basic bearing designation indicating a 105 mm bore, 160 mm OD, and 52 mm width. |
| AC | Angular Contact design with a 25° contact angle for optimal axial load capacity. |
| D | Indicates a Duplex (two-bearing) set. |
| P4A | Specifies the high-precision tolerance class, exceeding ABEC 7/ISO P4 standards, for minimal runout and vibration. |
| DB | Specifies the Back-to-Back mounting arrangement, which provides high moment rigidity. |
| C | Indicates the Moderate preload level, balancing rigidity, speed, and thermal characteristics. |
7021 ACD/P4ADBC Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back (DB) configuration creates a large spread between load centers, significantly increasing the system's moment stiffness and its ability to handle combined radial and axial loads simultaneously. The 25° contact angle is optimized for substantial axial load support.
Precision & High-Speed Performance: Built to P4A tolerance class, this bearing ensures extremely tight dimensional and running accuracy. The lightweight phenolic cage is engineered for stable operation at high speeds, contributing to the bearing's impressive limiting speed of 16,000 rpm. The open seal type minimizes friction for maximum speed capability.
Superior Material & Construction: Both rings and balls are made from high-grade chrome steel, ensuring high durability and long service life under demanding operating conditions. The set is pre-lubricated and ready for installation, suitable for a temperature range of -30°C to 110°C.
7021 ACD/P4ADBC Bearing Typical Application Areas
The 7021 ACD/P4ADBC is engineered for high-performance applications, including:
- Machine Tool Spindles: CNC machining centers, grinding spindles, and milling spindles requiring high precision and rigidity.
- High-Frequency Motors & Spindles: Applications where high rotational speeds and accuracy are paramount.
- Precision Robotic Drives: Articulated arms and high-accuracy positioning systems.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and other critical navigation or control systems.
