71906 ACD/P4ATBTC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71906 ACD/P4ATBTC
Basic Information
System of measurement
Metric
Weight
0.14 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
30 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
47 mm
Outside diameter tolerance
-0.004mm to 0
Width
27 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
20
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
3285 lbf
Radial static load rating
2902 lbf
Limiting speed
83 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Triplex Back-to-Back (TBT)
Number of bearings in matched set
3
Universal matching bearing
No (Standard)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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71906 ACD/P4ATBTC Bearing Product Overview & Core Advantages
The 71906 ACD/P4ATBTC is a metric precision angular contact ball bearing supplied as a matched triplex set in a back-to-back (TBT) arrangement. Engineered for applications demanding exceptional rotational accuracy and rigidity, this bearing is designed to accommodate combined loads (radial and axial) simultaneously. Its P4A super-precision tolerance class and moderate preload (Class C) ensure smooth, high-precision operation, making it ideal for high-performance spindles and other critical machinery components.
71906 ACD/P4ATBTC Bearing Model Code Explained, Specifications & Naming Convention
The model number 71906 ACD/P4ATBTC is decoded as follows:
- 71906: Basic series designation for a high-precision angular contact ball bearing.
- AC: Angular Contact design with a 25° contact angle.
- D: Indicates a specific internal design and load capacity.
- P4A: Denotes a super-precision tolerance class, exceeding ABEC 7/ISO P4 standards.
- TBT: Specifies the bearing is part of a Triplex Back-to-Back matched set.
- C: Indicates the preload level is Moderate (Class C).
71906 ACD/P4ATBTC Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The triplex back-to-back (TBT) arrangement creates a highly rigid bearing system, effectively resisting complex moment loads and maintaining shaft positioning under demanding conditions.
- Superior Load Capacity: The 25° contact angle and robust construction provide excellent capacity for combined radial and axial loads.
- Precision & High-Speed Capability: Manufactured to P4A tolerance standards with a phenolic resin cage, this bearing ensures minimal runout and stable operation, suitable for high-speed applications up to 83,000 rpm (grease lubricated).
- Optimized Material Selection: Components made from chrome steel offer high hardness and durability, while the phenolic cage contributes to low friction and smooth operation at high speeds.
71906 ACD/P4ATBTC Bearing Typical Application Areas
This high-precision, preloaded bearing set is ideally suited for:
- Machine Tool Spindles (e.g., CNC milling, grinding, and turning centers)
- High-Speed Machining Centers
- Precision Grinding Spindles
- High-Frequency Spindles
- Other industrial equipment requiring ultra-high rigidity and rotational accuracy
