7211 CD/P4ADBB
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7211 CD/P4ADBB
Basic Information
System of measurement
Metric
Weight
1.23 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
55 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
100 mm
Outside diameter tolerance
-0.004mm to 0
Width
42 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
14.288 mm
Ball quantity
15
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
20340 lbf
Radial static load rating
19125 lbf
Limiting speed
34 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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7211 CD/P4ADBB Bearing Product Overview & Core Advantages
The 7211 CD/P4ADBB is a precision duplex angular contact ball bearing designed for applications requiring exceptional rigidity and running accuracy. This matched back-to-back (DB) arrangement is preloaded to Light / Class B specifications, delivering superior stability and minimal axial/radial runout. Its primary advantage lies in its ability to handle combined loads (radial and axial) simultaneously with high precision, making it ideal for high-speed spindles and other demanding machinery where high rigidity and positional accuracy are critical.
7211 CD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
The model number 7211 CD/P4ADBB is decoded as follows:
- 7211: Basic bearing series, indicating a 55mm bore, 100mm OD, and 42mm width.
- C: Denotes a 15° contact angle, optimized for high-speed performance with moderate axial load capacity.
- D: Indicates the bearing is part of a duplex (DB) pair in a back-to-back arrangement.
- P4A: Specifies a high-precision tolerance class (superior to ABEC 7), ensuring extremely tight dimensional and running accuracy.
- DB: Confirms the Duplex Back-to-Back matched set configuration.
- B: Indicates the Light preload level applied to the matched set.
7211 CD/P4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a rigid bearing system that effectively resists moment loads and shaft deflection, providing exceptional operational stability.
- Precision Performance: Manufactured to P4A tolerance class, this bearing ensures minimal runout and vibration, which is critical for high-precision applications.
- Optimized for High Speeds: The 15° contact angle and phenolic resin cage contribute to lower friction and higher limiting speeds, suitable for applications up to 34,000 rpm.
- Superior Load Capacity: With a dynamic load rating of 20,340 lbf and static load rating of 19,125 lbf, it reliably handles significant combined radial and axial loads.
- Quality Materials: Constructed from chrome steel for rings and balls, ensuring high durability and long service life under demanding conditions.
7211 CD/P4ADBB Bearing Typical Application Areas
This precision bearing is specifically engineered for high-performance applications including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers
- Precision Gearboxes: Industrial transmissions requiring minimal backlash
- High-Frequency Motors: Spindle motors and high-RPM electric motors
- Medical Equipment: Dental handpieces and surgical tools
- Aerospace Components: Gyroscopes, navigation systems, and auxiliary power units
