7208 CD/P4ADBC
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7208 CD/P4ADBC
Basic Information
System of measurement
Metric
Weight
0.75 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
40 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
80 mm
Outside diameter tolerance
-0.004mm to 0
Width
36 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
11.112 mm
Ball quantity
14
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
12442 lbf
Radial static load rating
10800 lbf
Limiting speed
41 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
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
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7208 CD/P4ADBC Bearing Product Overview & Core Advantages
The 7208 CD/P4ADBC is a precision duplex angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high rigidity. This back-to-back (DB) matched pair is preloaded to Moderate / Class C standards, ensuring optimal stiffness and minimal axial/radial runout. Its primary advantage lies in its ability to handle combined loads—significant radial forces alongside substantial axial loads in both directions—making it ideal for high-precision, high-speed spindles and machinery where positioning accuracy is critical.
7208 CD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
The model number 7208 CD/P4ADBC is decoded as follows:
- 7208: Basic bearing series, indicating a light-weight angular contact ball bearing with a 40mm bore, 80mm OD, and 36mm width.
- C: Denotes a 15° contact angle, optimized for high-speed operation and moderate axial load capacity.
- D: Indicates the bearing is part of a Duplex (paired) set.
- P4A: Specifies an ultra-precision tolerance class exceeding ABEC 7/ISO P4 standards, ensuring extremely tight dimensional and running accuracy.
- DB: Defines the Duplex Back-to-Back mounting arrangement, which provides high moment rigidity and stability under complex load conditions.
- C: Indicates a Moderate preload (Class C) is applied to the matched set, enhancing system stiffness and rotational precision.
7208 CD/P4ADBC Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The back-to-back (DB) duplex arrangement creates a wide, stable support system that effectively resists moment loads and tilting, providing exceptional rigidity for precise shaft positioning.
- Superior Load Capacity: Engineered with a 15° contact angle and high-grade chrome steel components, this bearing is capable of supporting high radial dynamic loads (12,442 lbf) and static loads (10,800 lbf) in combination with bidirectional axial loads.
- Optimized High-Speed Performance: The lightweight, durable phenolic resin cage and precision-ground components enable a high limiting speed of 41,000 rpm, minimizing centrifugal forces and friction for smooth, cool operation.
- Precision & Longevity: Manufactured to P4A tolerance class, the bearing guarantees minimal runout and vibration. The open seal type allows for custom lubrication schemes to maximize performance and service life within the specified temperature range (-30°C to 110°C).
7208 CD/P4ADBC Bearing Typical Application Areas
This high-precision duplex bearing is ideally suited for demanding applications including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring extreme accuracy and rigidity.
- Precision Gearboxes and High-Frequency Motor Spindles.
- Industrial Pumps and Compressors operating at high rotational speeds.
- Medical Equipment and Aerospace Instrumentation where reliability and precision are non-negotiable.
