71915 CDGB/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71915 CDGB/P4A
Basic Information
System of measurement
Metric
Weight
0.35 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
75 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
105 mm
Outside diameter tolerance
-0.004mm to 0
Width
16 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
9.525 mm
Ball quantity
26
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
8055 lbf
Radial static load rating
8438 lbf
Limiting speed
36 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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71915 CDGB/P4A Bearing Product Overview & Core Advantages
The 71915 CDGB/P4A is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. As a single bearing with a Universal Matchable (SU) designation, it is engineered to be paired with an identical bearing to form a precisely preloaded duplex set. Its core advantages include the ability to handle combined loads (radial and axial), outstanding operational stability due to its P4A tolerance class, and high-speed capability enabled by its phenolic cage and optimized 15° contact angle.
71915 CDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
The model number 71915 CDGB/P4A is decoded as follows:
- 71915: The basic bearing series, indicating a super-precision, 15° contact angle design with a 75mm bore, 105mm OD, and 16mm width.
- C: Signifies a 15° contact angle.
- D: Indicates the bearing is supplied as a Universal Matchable (SU) set. Two bearings are supplied as a matched pair for duplex mounting.
- G: Specifies a Light preload / Class B.
- B: Denotes a higher grade of dimensional and running accuracy within the P4 classification.
- /P4A: The tolerance class, denoting very high precision for both dimensional and running accuracy (geometrical tolerances).
71915 CDGB/P4A Bearing Structural Features & Performance Benefits
- High Precision and Rigidity: Manufactured to P4A tolerance class, this bearing ensures minimal runout and vibration, providing the high rigidity necessary for precise spindle applications. The Universal Matchable (SU) pairing allows for simplified assembly of preloaded arrangements, further enhancing system stiffness.
- Optimized Load Capacity: The 15° contact angle is ideal for applications where high radial dynamic load rating (8055 lbf) is required alongside moderate axial loads, effectively managing combined loads.
- Superior High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, contributing to a high limiting speed of 36,000 rpm. This material also offers excellent performance under lubricant starvation.
- Pre-Lubricated for Immediate Service: The bearing is supplied lubricated, ready for immediate installation and initial operation within its specified temperature range of -30°C to 110°C.
71915 CDGB/P4A Bearing Typical Application Areas
This precision bearing is ideally suited for high-performance machinery requiring extreme accuracy and speed, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing machines.
- High-Frequency Motors: Spindles for electric motors operating at very high RPM.
- Aerospace Gyroscopes and Instrumentation: Where uncompromising precision is critical.
