7012 ACBGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7012 ACBGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.43 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
60 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
95 mm
Outside diameter tolerance
-0.004mm to 0
Width
18 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
6.747 mm
Ball quantity
28
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
3038 lbf
Radial static load rating
2565 lbf
Limiting speed
39 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
4
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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7012 ACBGA/HCP4A Bearing Product Overview & Core Advantages
The 7012 ACBGA/HCP4A is a single-row angular contact ball bearing engineered for ultra-high precision applications. Positioned in the P4A super-precision tolerance class, it delivers exceptional rotational accuracy and running quietness. Its defining feature is the use of ceramic balls (Silicon Nitride) and a phenolic resin cage, which collectively enable superior high-speed performance, reduced friction, and extended service life. This bearing is pre-lubricated and designed to handle significant axial loads in one direction, making it an ideal, compact solution for demanding, high-reliability machinery.
7012 ACBGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7012 | Standard bearing series number, indicating a 60 mm bore, 95 mm OD, and 18 mm width. |
| AC | Angular Contact design. |
| BG | The bearing is supplied with a universal matchable (SU) designation. |
| A | 30° contact angle (Note: Specification states 25°, the suffix may denote a specific design variant). |
| HC | Hybrid Ceramic, signifying steel rings with ceramic (Si3N4) balls. |
| P4A | Super Precision tolerance class, exceeding ABEC 7/ISO P4 standards. |
7012 ACBGA/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls significantly reduces friction, heat generation, and wear. This construction is electrically insulating and allows for much higher limiting speeds compared to all-steel equivalents.
- Phenolic Resin Cage: The lightweight and robust phenolic cage contributes to smooth operation at high speeds, offers excellent strength, and operates effectively within the specified temperature range.
- Precision & Rigidity: Manufactured to P4A tolerance with very tight dimensional runouts, this bearing ensures high positional accuracy and system rigidity.
- Universal Matching (SU): Bearings with the SU designation can be mounted in any combination (back-to-back, face-to-face, or tandem) to form a preloaded set, simplifying procurement and assembly for complex spindle designs.
- High-Speed Capability: The synergy of ceramic balls, a phenolic cage, and optimized internal geometry allows this bearing to achieve a high limiting speed of 39,000 rpm.
7012 ACBGA/HCP4A Bearing Typical Application Areas
This bearing is specifically designed for high-performance applications, including:
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Motors and Electric Spindles
- Aerospace Auxiliary Systems
- Semiconductor Manufacturing Equipment
