71984 BM
Single Row Angular Contact Ball Bearings
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Part No.
Part No.
71984 BM
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
44.5 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
420 mm
Bore diameter tolerance
-0.035mm to 0
Outside diameter
560 mm
Outside diameter tolerance
-0.038mm to 0
Width
65 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
4 mm
Contact angle
40 °
Distance from side face to load point
238 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
472 mm
Outer Ring Dimensions
Shoulder diameter outer ring
507 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
81900 lbf
Radial static load rating
150750 lbf
Limiting speed
1.2 X 1000 rpm
Lubrication
Lubricated
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Brass
Environment & Compliance
REACH
Compliant
ROHS
Compliant
Technical Drawings
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In Stock
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71984 BM Bearing Product Overview & Core Advantages
The 71984 BM is a single row angular contact ball bearing engineered for high-precision applications requiring superior axial load capacity and rigidity. Designed with a 40° contact angle, this bearing excels at handling combined radial and substantial unidirectional axial loads simultaneously. Its P6 (ABEC-3) tolerance class ensures exceptional running accuracy, making it ideal for demanding, high-reliability machinery. The open design, combined with brass cage construction, facilitates optimal lubrication flow and is suitable for high-speed operation up to 1,200 rpm.
71984 BM Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning | Significance |
|---|---|---|
| BM | Brass Cage, Machined | Indicates a high-strength, machined brass cage that provides excellent dimensional stability and guidance, contributing to smooth operation at high speeds and under demanding conditions. |
71984 BM Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The single row design with a 40° contact angle is optimized to support significant combined loads, offering high rigidity against moment loads. With a dynamic load rating of 81,900 lbf and a static load rating of 150,750 lbf, it delivers robust performance in heavy-duty applications.
- Precision & Speed: Manufactured to P6 tolerance class, this bearing ensures minimal runout and vibration. The machined brass cage (BM) is lightweight and strong, enabling stable operation at the limiting speed of 1,200 rpm.
- Optimized Internal Geometry: Critical dimensions such as the shoulder diameters (Outer: 507 mm, Inner: 472 mm) and the distance from the side face to the load point (238 mm) are precisely controlled to ensure correct mounting and optimal load distribution.
- Material Integrity: Constructed from chrome steel for both rings and balls, the bearing provides high fatigue resistance and long service life under standard operating temperatures from -30°C to 110°C.
71984 BM Bearing Typical Application Areas
This angular contact ball bearing is ideally suited for precision machinery and heavy-duty equipment, including:
- Machine Tool Spindles
- Industrial Pumps and Compressors
- Gearboxes and Power Transmission Systems
- Precision Rotary Tables
- Material Handling Equipment
