71908 ACE/HCP4ADBG3
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71908 ACE/HCP4ADBG3
Basic Information
System of measurement
Metric
Weight
0.18 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
62 mm
Outside diameter tolerance
-0.004mm to 0
Width
24 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
19
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
3398 lbf
Radial static load rating
2565 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
Available
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
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71908 ACE/HCP4ADBG3 Bearing Product Overview & Core Advantages
The 71908 ACE/HCP4ADBG3 is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This duplex back-to-back (DB) arrangement provides superior rigidity and the ability to withstand combined radial and axial loads from both directions. Manufactured to a P4A tolerance class and featuring a phenolic cage and ceramic balls, it is engineered for high-speed operation and long service life in precision machinery.
71908 ACE/HCP4ADBG3 Bearing Model Code Explained, Specifications & Naming Convention
The model number 71908 ACE/HCP4ADBG3 is decoded as follows:
- 71908: Basic bearing series and size designation (40mm bore, 62mm OD).
- ACE: Specific internal design and contact angle (25°).
- HC: Hybrid Ceramic construction (steel rings with ceramic balls).
- P4A: High precision tolerance class, exceeding ABEC 7/ISO P4.
- DB: Duplex Back-to-Back preloaded arrangement.
- G3: Specific preload level within the matched set.
71908 ACE/HCP4ADBG3 Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex back-to-back (DB) arrangement creates a rigid bearing system that effectively resists moment loads and supports heavy combined loads.
- Superior High-Speed Performance: The combination of a lightweight phenolic cage and low-density ceramic (Si3N4) balls reduces centrifugal forces, enabling a high limiting speed of 41,000 rpm.
- Enhanced Durability and Temperature Stability: Ceramic balls provide excellent wear resistance, lower friction, and can operate effectively within a wide temperature range (-30°C to 110°C). The phenolic cage offers good dimensional stability at high speeds.
- Precision Engineering: Manufactured to P4A tolerance class, this bearing ensures minimal runout and vibration, which is critical for applications requiring high rotational accuracy.
71908 ACE/HCP4ADBG3 Bearing Typical Application Areas
This high-performance duplex bearing set
Machine Tool Spindles
High-Frequency Motors
Precision Grinding Spindles
Aerospace & Defense Systems
Medical & Dental Equipment
