71918 ACDGC/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71918 ACDGC/P4A
Basic Information
System of measurement
Metric
Weight
0.55 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
90 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
125 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
11.112 mm
Ball quantity
26
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
9945 lbf
Radial static load rating
10800 lbf
Limiting speed
15 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
3
Universal matching bearing
Universal Matchable (SU)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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71918 ACDGC/P4A Bearing Product Overview & Core Advantages
The 71918 ACDGC/P4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. Engineered with a 25° contact angle and Moderate (Class C) preload, this bearing excels at handling combined loads—simultaneously supporting substantial radial and axial forces. Its P4A tolerance class ensures ultra-precise dimensions and running accuracy, making it ideal for high-speed spindles and precision machinery where minimal runout and high system rigidity are critical.
71918 ACDGC/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| AC | Angular Contact design with a 25° contact angle, optimized for combined loads. |
| D | High ball count and optimized internal geometry for increased load capacity. |
| GC | Specific internal clearance and preload grouping for Moderate (Class C) preload. |
| P4A | Super-precision tolerance class, exceeding ABEC 7 standards, for exceptional running accuracy and low vibration. |
71918 ACDGC/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The angular contact design and 25° contact angle provide superior stiffness, effectively resisting deflection under combined radial and axial loads. With a dynamic load rating of 9945 lbf and static rating of 10800 lbf, it offers reliable performance in strenuous conditions.
- Precision & Speed Performance: Manufactured to P4A tolerance class with tight dimensional controls (bore/OD tolerance: -0.004mm to 0), this bearing ensures minimal vibration and high positional accuracy. The phenolic cage contributes to lower friction and higher limiting speeds (15,000 rpm), suitable for high-speed applications.
- Optimized for Matched Sets: Designated as Universal Matchable (SU), this bearing can be supplied in pre-matched sets (typically 3 bearings) to achieve specific preload and stiffness characteristics when mounted in pairs or triples, simplifying installation and enhancing system performance.
- Material & Construction: Manufactured from chrome steel for both rings and balls, ensuring high durability and wear resistance. The open seal type allows for custom lubrication schemes to optimize performance for specific operational temperatures (-30°C to 110°C).
71918 ACDGC/P4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring high rigidity and precision.
- Precision Rotary Systems: Industrial robots, CNC indexing tables, and rotary transfer machines.
- High-Speed Motors & Spindles: Applications demanding low friction and high rotational accuracy.
- Medical & Laboratory Equipment: Centrifuges and precision instruments where reliability and accuracy are paramount.
