71907 ACD/P4AQBCC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71907 ACD/P4AQBCC
Basic Information
System of measurement
Metric
Weight
0.3 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
35 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
55 mm
Outside diameter tolerance
-0.004mm to 0
Width
40 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
5.556 mm
Ball quantity
21
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
5445 lbf
Radial static load rating
5512 lbf
Limiting speed
56 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Quadruplex Back-to-Back (QBC)
Number of bearings in matched set
4
Universal matching bearing
No (Standard)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
Price available upon request.
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71907 ACD/P4AQBCC Bearing Product Overview & Core Advantages
The 71907 ACD/P4AQBCC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This metric bearing features a Quadruplex Back-to-Back (QBC) matched arrangement, providing superior stiffness and the ability to withstand combined loads (radial and axial) from multiple directions. With a P4A tolerance class and moderate preload (Class C), it is engineered for high-precision, high-reliability scenarios where minimal runout and stable performance are critical.
71907 ACD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
The model number 71907 ACD/P4AQBCC is decoded as follows:
- 71907: Basic bearing series, indicating a light series angular contact ball bearing with a 35mm bore, 55mm OD, and 40mm width.
- ACD: Angular Contact design with a 25° contact angle.
- P4A: Denotes a high-precision tolerance class, exceeding ABEC-7 standards, ensuring extremely tight dimensional and running accuracy.
- QBCC: Specifies the Quadruplex Back-to-Back (QBC) matched arrangement consisting of 4 bearings supplied as a pre-matched set for optimal performance and load distribution.
71907 ACD/P4AQBCC Bearing Structural Features & Performance Benefits
- Exceptional Rigidity & Load Capacity: The Quadruplex Back-to-Back (QBC) arrangement creates a highly rigid bearing system capable of handling significant combined radial and axial loads. This configuration effectively counteracts moment loads, making it ideal for applications requiring high positional accuracy.
- Precision Performance: Manufactured to P4A tolerance class, this bearing ensures minimal vibration and precise shaft guidance. The moderate preload (Class C) eliminates internal clearance, enhancing system stiffness and rotational accuracy from startup.
- Optimized High-Speed Capability: The phenolic resin cage is lightweight and robust, contributing to lower centrifugal forces and enabling smooth operation at high rotational speeds, with a limiting speed of 56,000 rpm.
- Durable Material Construction: Both rings and balls are made from chrome steel, providing high hardness, wear resistance, and a long operational lifespan under demanding conditions.
71907 ACD/P4AQBCC Bearing Typical Application Areas
This high-precision, high-rigidity bearing is ideally suited for:
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and precision lathes.
- Precision Industrial Equipment: High-frequency spindles, robotic arm joints, and rotary tables.
- Aerospace & Defense Systems: Gyroscopes, radar positioning systems, and avionics.
- Medical Equipment: Dental handpieces, high-speed centrifuges, and imaging scanner gantries.
