718/670 ACMB
Single Row Angular Contact Ball Bearings
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Part No.
Part No.
718/670 ACMB
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
77 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
670 mm
Bore diameter tolerance
-0.05mm to 0
Outside diameter
820 mm
Outside diameter tolerance
-0.06mm to 0
Width
69 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
4 mm
Contact angle
40 °
Distance from side face to load point
208 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
720.5 mm
Outer Ring Dimensions
Shoulder diameter outer ring
771 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
124425 lbf
Radial static load rating
290250 lbf
Limiting speed
0.75 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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718/670 ACMB Bearing Product Overview & Core Advantages
The 718/670 ACMB is a single row angular contact ball bearing engineered for high-precision applications requiring exceptional rigidity and load capacity. This precision bearing is designed to accommodate combined loads, efficiently handling significant radial loads and unidirectional axial loads simultaneously. Manufactured to a P6 (ABEC-3) tolerance class with a steep 40° contact angle, it delivers high running accuracy and is optimized for high-stiffness arrangements. Its robust construction makes it ideal for demanding, high-reliability industrial environments.
718/670 ACMB Bearing Model Code Explained, Specifications & Naming Convention
The model number 718/670 ACMB is decoded as follows:
- 718: Series designation for a metric, single row angular contact ball bearing.
- 670: The bore diameter in millimeters (670 mm).
- A: Signifies a 30° contact angle (Note: The specification indicates a 40° angle, which is a specific variant within this series).
- C: Indicates a modified internal clearance and geometry for optimized performance.
- MB: Denotes a brass cage (Machined Brass), which provides excellent strength and guidance for high-speed applications.
718/670 ACMB Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The single row design with a steep 40° contact angle provides superior axial rigidity and enables the bearing to support high radial dynamic load ratings of 124,425 lbf and static load ratings of 290,250 lbf.
- Precision Engineering: Manufactured to P6 tolerance, this bearing ensures minimal runout and high positional accuracy, which is critical for precision machinery.
- Optimized for High-Speed Operation: The use of a brass machined cage (MB) ensures stable operation and reliable ball guidance, contributing to a higher limiting speed capability.
- Robust Material Construction: Made from chrome steel for both rings and balls, the bearing offers high durability and resistance to wear, suitable for a wide temperature range from -30°C to 110°C.
- Pre-Lubricated: The bearing comes lubricated from the factory, ensuring immediate readiness for operation and reducing initial setup complexity.
718/670 ACMB Bearing Typical Application Areas
This bearing is ideally suited for heavy-duty, high-precision applications, including:
- Large Machine Tool Spindles
- Industrial Gearboxes
- Heavy-Duty Pumps and Compressors
- Precision Turntables and Indexing Tables
- Mining and Construction Equipment
