7006 ACD/HCP4ADBC
Hybrid Ceramic Super Precision Bearings
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7006 ACD/HCP4ADBC Bearing Product Overview & Core Advantages
The 7006 ACD/HCP4ADBC is a high-precision, **metric duplex angular contact ball bearing** designed for demanding applications requiring exceptional rigidity and rotational accuracy. This **matched set** of two bearings in a **back-to-back (DB) arrangement** is engineered to handle **combined radial and axial loads** simultaneously. Featuring a **25° contact angle** and **P4A super precision tolerance**, it delivers superior running accuracy and system stability. The use of **ceramic balls** significantly reduces centrifugal forces, enabling higher speeds and providing non-conductive properties, while the phenolic cage ensures smooth operation at the **limiting speed of 72,500 rpm**. This configuration is ideal for applications where **high rigidity**, **high-speed performance**, and **moderate preload** are critical.
7006 ACD/HCP4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7006 | Basic bearing series and size designation (30mm bore, 55mm OD, 26mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Duplex (Two single bearings supplied as a matched set). |
| HC | Hybrid Ceramic, indicating the balls are made of ceramic material (Si3N4). |
| P4A | Tolerance class equivalent to ABEC 7 (P4) with additional running accuracy requirements. |
| DB | Back-to-Back mounting arrangement of the duplex pair. |
| C | Moderate preload (Class C). |
7006 ACD/HCP4ADBC Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex back-to-back (DB) arrangementcombined radial and axial loads.
- Superior High-Speed Performance: The combination of ceramic ballsphenolic resin cage enables operation at the high limiting speed of 72,500 rpm. This makes it an ideal high-speed bearing for precision spindles.
- Precision & Accuracy: Manufactured to P4A tolerance class with tight dimensional control on bore diameter, outside diameter, and width, ensuring minimal runout and superior rotational accuracy for precision machinery.
- Optimized Preload: The bearings are supplied with a moderate preload (Class C) applied, which eliminates internal clearance, increases system stiffness, and ensures precise shaft positioning without requiring adjustment during installation.
