71936 ACD/P4ATBTA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71936 ACD/P4ATBTA
Basic Information
System of measurement
Metric
Weight
12.6 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
180 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
250 mm
Outside diameter tolerance
-0.004mm to 0
Width
99 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
22.225 mm
Ball quantity
27
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
77625 lbf
Radial static load rating
135000 lbf
Limiting speed
16.25 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
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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71936 ACD/P4ATBTA Bearing Product Overview & Core Advantages
The 71936 ACD/P4ATBTA is a precision angular contact ball bearing designed for applications demanding exceptional rigidity and accuracy. This triplex matched set in a back-to-back (TBT) arrangement provides superior stability and can accommodate combined radial and axial loads. Manufactured to P4A tolerance class, it ensures high running accuracy and is preloaded to Extra Light (Class A) for optimal performance in high-speed, high-precision scenarios.
71936 ACD/P4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
The model number 71936 ACD/P4ATBTA is decoded as follows:
- 71936: Basic bearing series and size designation (180mm bore, 250mm OD).
- ACD: Angular Contact design with a 25° contact angle.
- P4A: Denotes a super-precision tolerance class, exceeding ABEC 7 standards.
- TBT: Indicates a Triplex Back-to-Back matched set of three bearings.
- A: Specifies an Extra Light preload on the matched set.
71936 ACD/P4ATBTA Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The triplex back-to-back arrangement creates a rigid bearing system that effectively resists moment loads and maintains shaft positioning under heavy combined loads.
- Precision Performance: The P4A tolerance class and controlled preload ensure minimal runout and vibration, which is critical for high-speed applications up to 16,250 rpm.
- Optimized Internal Geometry: Featuring a 25° contact angle, 27 balls made of chrome steel, and a phenolic cage, this bearing is engineered for high-speed operation and long service life.
- Superior Load Capacity: With a dynamic load rating of 77,625 lbf and a static load rating of 135,000 lbf, it is built to handle demanding operational conditions.
71936 ACD/P4ATBTA Bearing Typical Application Areas
This bearing is ideally suited for high-precision machinery and systems requiring maximum rigidity and speed, including:
- Machine Tool Spindles
- High-Frequency Machining Centers
- Precision Grinding Spindles
- Industrial Pumps and Compressors
- Other high-performance rotational equipment where bearing accuracy and system stiffness are paramount.
