71940 ACD/P4ATBTC
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
71940 ACD/P4ATBTC
Basic Information
System of measurement
Metric
Weight
18.3 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
200 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
280 mm
Outside diameter tolerance
-0.004mm to 0
Width
114 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
25.4 mm
Ball quantity
26
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
95175 lbf
Radial static load rating
168750 lbf
Limiting speed
6.3 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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71940 ACD/P4ATBTC Bearing Product Overview & Core Advantages
The 71940 ACD/P4ATBTC is a high-precision angular contact ball bearing configured in a triplex back-to-back (TBT) matched set. This specific arrangement delivers exceptional system rigidity and is engineered to handle complex combined loads, including significant radial and bidirectional axial loads simultaneously. Manufactured to the exacting P4A tolerance class, it is designed for applications demanding the highest levels of rotational accuracy and operational reliability in demanding industrial environments.
71940 ACD/P4ATBTC Bearing Model Code Explained, Specifications & Naming Convention
The model number 71940 ACD/P4ATBTC provides detailed technical specifications:
- 71940: Basic bearing series and size designation (200mm bore, 280mm OD).
- A: Denotes a 25° contact angle, optimized for supporting high axial loads.
- CD: Indicates a Moderate (Class C) preload applied to the bearing set, enhancing stiffness and minimizing axial/radial play.
- P4A: Specifies the ultra-precision tolerance class, exceeding standard ABEC 7/ISO P4 levels for superior running accuracy.
- TBT: Defines the Triplex Back-to-Back matched arrangement of three bearings, providing maximum moment stiffness.
- C: Identifies the cage material as Phenolic, suitable for high-speed operation.
71940 ACD/P4ATBTC Bearing Structural Features & Performance Benefits
- Exceptional Rigidity and Load Capacity: The triplex back-to-back (TBT) configuration creates an extremely rigid bearing system capable of withstanding heavy combined loads and tilting moments, making it ideal for precision spindles.
- High-Speed Capability: The lightweight phenolic cage and optimized internal geometry contribute to lower centrifugal forces and friction, enabling a high limiting speed of 6,300 rpm.
- Precision Performance: Manufactured to P4A tolerance class with a moderate preload, this bearing ensures minimal runout, precise shaft positioning, and reduced vibration for superior machining or operational outcomes.
- Robust Construction: Components made from chrome steel provide high load ratings (Dynamic: 95,175 lbf, Static: 168,750 lbf) and excellent durability under demanding conditions.
71940 ACD/P4ATBTC Bearing Typical Application Areas
This precision bearing is specifically designed for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: Applications in semiconductor manufacturing, PCB drilling, and optical grinding.
- High-Frequency Motors and other equipment requiring extreme rotational accuracy and rigidity.
