7011 CD/P4ATBTA
7000 Series Super Precision Angular Contact Ball Bearings
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7011 CD/P4ATBTA Bearing Product Overview & Core Advantages
The 7011 CD/P4ATBTA is a metric precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This bearing is supplied as a triplex back-to-back (TBT) matched set, delivering superior performance in handling combined loads (radial and axial) from both directions. Manufactured to the stringent P4A tolerance class, it offers extremely tight dimensional control for high-precision machinery. Its extra light preload (Class A) ensures minimal deflection and smooth operation, making it ideal for high-speed spindles and other critical applications where high rigidity and precision are paramount.
7011 CD/P4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7011 | Basic bearing designation (55mm bore, 90mm OD) |
| C | 15° contact angle |
| D | Enhanced internal geometry for optimized load distribution |
| P4A | High precision tolerance class (exceeding ABEC 7) |
| TBT | Triplex Back-to-Back matched arrangement |
| A | Extra light preload (Class A) |
7011 CD/P4ATBTA Bearing Structural Features & Performance Benefits
- Triplex Back-to-Back Design: The three-bearing matched set creates an extremely rigid support system, significantly reducing axial and radial deflection under heavy combined loads.
- P4A Precision & Tight Tolerances: With bore and outside diameter tolerances of -0.004mm to 0, this bearing ensures precise shaft positioning and minimal runout, critical for high-speed and high-accuracy applications.
- Optimized Internal Geometry: The 15° contact angle and carefully calculated ball diameter (11.112mm) and quantity (18) provide an excellent balance between axial load capacity and limiting speed (34,000 rpm).
- Phenolic Cage: The lightweight and robust phenolic resin cage contributes to smooth operation at high speeds and is suitable for the specified temperature range (-30°C to 110°C).
- Preload Configuration: The extra light preload eliminates internal clearance, enhancing system stiffness and rotational accuracy without generating excessive heat.
7011 CD/P4ATBTA Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring maximum rigidity and precision.
- Precision Gearboxes: Applications where low noise, high accuracy, and minimal deflection are critical.
- High-Frequency Motors and Spindle Drives.
- Medical Equipment: High-speed dental handpieces and imaging device rotors.
- Aerospace Actuation Systems and other specialized machinery demanding P4A level precision.
