S71908 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
S71908 CDGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.1 kg
Tolerance class
P4A
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
40 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
62 mm
Outside diameter tolerance
-0.004mm to 0
Width
12 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
21
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
2790 lbf
Radial static load rating
1912 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Grease
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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S71908 CDGA/HCP4A Bearing Product Overview & Core Advantages
The S71908 CDGA/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. This sealed bearing features a universal matchable (SU) design, allowing two bearings to be paired for optimal performance in preloaded arrangements. Its core advantages include superior high-speed capability with a limiting speed of 41,000 rpm, enabled by a phenolic cage and ceramic balls, and the ability to handle combined loads with a 15° contact angle. The sealed, pre-lubricated design ensures long-term, maintenance-free operation, making it ideal for high-reliability and high-rigidity applications.
S71908 CDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S | Bearing with a 15° contact angle. |
| 71908 | Basic bearing designation (40mm bore, 62mm OD, 12mm width). |
| CD | Universal matchable bearing design. When two are mounted together, they provide a predefined contact angle and preload. |
| GA | Indicates a specific preload level (Extra light / Class A). |
| HC | Refers to the hybrid ceramic construction (Ceramic balls with steel rings). |
| P4A | Specifies a very high tolerance class for exceptional running accuracy and dimensional precision. |
S71908 CDGA/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Design: The combination of chrome steel rings and ceramic balls significantly reduces friction and heat generation, enabling higher limiting speeds and longer service life compared to all-steel bearings.
- High Rigidity & Precision: The P4A tolerance class ensures minimal runout and precise dimensional stability, which is critical for applications requiring high positional accuracy and smooth operation.
- Optimized High-Speed Performance: The lightweight phenolic cage and low-friction ceramic balls work in tandem to support the very high limiting speed of 41,000 rpm, making it a true high-speed bearing.
- Superior Load Capacity: The 15° contact angle and robust construction provide excellent capability to handle combined radial and axial loads simultaneously.
- Sealed and Pre-lubricated: The integral seals protect against contamination, and the factory-applied grease lubrication ensures ready-to-install, maintenance-free operation within the specified temperature range.
S71908 CDGA/HCP4A Bearing Typical Application Areas
- High-Speed Machine Tool Spindles
- Precision Grinding Spindles
- High-Frequency Motors and Spindles
- Medical and Dental Equipment
- Aerospace Actuators and Instrumentation
- Semiconductor Manufacturing Equipment
