71920 ACD/P4ATBTB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71920 ACD/P4ATBTB
Basic Information
System of measurement
Metric
Weight
2.4 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
100 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
140 mm
Outside diameter tolerance
-0.004mm to 0
Width
60 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
12.7 mm
Ball quantity
26
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
27900 lbf
Radial static load rating
42750 lbf
Limiting speed
15 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
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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71920 ACD/P4ATBTB Bearing Product Overview & Core Advantages
The 71920 ACD/P4ATBTB is a precision angular contact ball bearing configured as a triplex back-to-back (TBT) matched set. Engineered for applications demanding exceptional rotational accuracy and rigidity, this bearing set is designed to accommodate combined loads—significant radial loads and axial loads in both directions—simultaneously. Manufactured to the exacting P4A tolerance class and featuring a light preload (Class B), it delivers superior running precision, high stiffness, and stable performance in high-speed operational environments.
71920 ACD/P4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71920 | Basic bearing series and size designation (100mm bore, 140mm OD, 60mm width). |
| ACD | Angular Contact design with a 25° contact angle. |
| P4A | Indicates a high-precision tolerance class (superior to ABEC 7), ensuring minimal runout and vibration. |
| TBT | Specifies the bearing arrangement as a Triplex Back-to-Back matched set of three bearings. |
71920 ACD/P4ATBTB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The triplex back-to-back configuration creates a highly rigid support system, significantly increasing moment stiffness. This allows the bearing set to handle substantial combined radial and axial loads from both directions effectively.
- Precision & High-Speed Performance: Manufactured to P4A tolerance standards and featuring a lightweight, durable phenolic cage, this bearing ensures smooth operation and is capable of achieving a limiting speed of 15,000 rpm.
- Optimized Material & Design: Components are made from high-grade chrome steel, providing excellent durability and fatigue resistance. The optimized ball diameter (12.7mm) and quantity (26) contribute to a high dynamic load rating of 27,900 lbf and static load rating of 42,750 lbf.
- Preloaded & Ready-to-Install: The set comes with a light preload (Class B) applied, eliminating internal clearance and ensuring immediate precision performance upon installation, which simplifies mounting and reduces setup time.
71920 ACD/P4ATBTB Bearing Typical Application Areas
This precision triplex bearing set is ideally suited for high-performance machinery requiring extreme accuracy and rigidity. Key applications include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Gearboxes and High-Frequency Motors.
- Industrial Pumps and Compressors operating at high rotational speeds.
- Aerospace & Defense positioning systems and gyroscopes.
