71903 CEGA/HCPA9A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71903 CEGA/HCPA9A
Basic Information
System of measurement
Metric
Weight
0.014 kg
Tolerance class
PA9A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
17 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
30 mm
Outside diameter tolerance
-0.004mm to 0
Width
7 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
3.969 mm
Ball quantity
13
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
760 lbf
Radial static load rating
344 lbf
Limiting speed
80 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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In Stock
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71903 CEGA/HCPA9A Bearing Product Overview & Core Advantages
The 71903 CEGA/HCPA9A is a single-row angular contact ball bearing engineered for applications demanding high precision and exceptional performance. Positioned as a universal matchable bearing, it is designed to handle combined radial and axial loads simultaneously. Its construction with ceramic balls and PA9A tolerance class ensures superior rotational accuracy and reliability in demanding operational environments. The bearing comes pre-lubricated and is characterized by its compact bearing dimensions (17mm bore, 30mm OD, 7mm width), making it ideal for space-constrained, high-speed assemblies.
71903 CEGA/HCPA9A Bearing Model Code Explained, Specifications & Naming Convention
The model number 71903 CEGA/HCPA9A breaks down as follows to specify its technical features:
- 71903: Basic series designation, indicating a metric, single-row angular contact ball bearing with a 17mm bore and 30mm outside diameter.
- C: Denotes a 15° contact angle, optimized for high-speed applications and moderate axial loads.
- E: Signifies a high-precision PA9A tolerance class, providing extremely tight running accuracy for spindle and other critical applications.
- G: Indicates the use of phenolic resin (Phenolic) cage, which contributes to lower friction, reduced weight, and superior high-speed performance.
- A: Specifies an Extra light (A) preload for minimal running torque and precise positioning.
- H: Stands for Universal Matchable (SU), meaning the bearing is supplied as one of a set of two bearings that are universally interchangeable to achieve specific preload or clearance when mounted together.
- CP: Confirms the use of Hybrid Ceramic balls (steel rings with ceramic balls), offering benefits like higher speed capability, reduced weight, and extended service life.
- A9A: Reiterates the PA9A super-precision tolerance class.
71903 CEGA/HCPA9A Bearing Structural Features & Performance Benefits
- High-Speed Capability: The combination of a lightweight phenolic cage and low-density ceramic balls significantly reduces centrifugal forces, enabling very high limiting speeds (up to 80,000 rpm).
- Precision & Rigidity: Manufactured to PA9A tolerance standards with a defined 15° contact angle, this bearing provides exceptional running accuracy and system rigidity, crucial for minimizing vibration and deflection.
- Hybrid Ceramic Advantage: The silicon nitride (Si3N4) ceramic balls provide electrical insulation, lower thermal expansion, and superior performance in high-speed and potentially corrosive environments compared to all-steel designs.
- Universal Matching: Designed as a Universal Matchable (SU) bearing, it simplifies installation and ensures consistent preload and performance when used in matched pairs for spindle applications.
- Pre-Lubricated for Immediate Use: The bearing is supplied with grease, making it ready for immediate installation and operation within its specified temperature range.
71903 CEGA/HCPA9A Bearing Typical Application Areas
This high-precision angular contact ball bearing is ideally suited for:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy positioning systems.
- High-Frequency Motors & Spindles: PCB drilling spindles and dental handpieces.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and navigation equipment.
- Medical Equipment: Centrifuges and high-speed laboratory apparatus.
