628
600 Series Miniature Bearings
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Part No.
Part No.
628
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
17.1 g
Tolerance class
ABEC1
Seal type
Open
For load direction
Radial
Main Dimensions
Bore diameter
8 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
24 mm
Outside diameter tolerance
-0.008mm to 0
Width
8 mm
Width tolerance
-0.12mm to 0
Inner Ring Dimensions
Inner ring type
Standard
Ball & Washer Dimensions
Ball diameter
3.969 mm
Ball quantity
7
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
637 lbf
Radial static load rating
256 lbf
Limiting speed
28 X 1000 rpm
Lubrication
Required
Radial internal clearance
0.002mm to 0.013mm
Radial internal clearance
MC3
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Stainless Steel
Environment & Compliance
REACH
Compliant
ROHS
Compliant
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 1.13
/ each
In Stock
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628 Bearing Product Overview & Core Advantages
The 628 metric ball bearing is a fundamental single row deep groove ball bearing designed for exceptional reliability in a wide range of applications. Engineered to primarily support radial loads, its versatile design also accommodates moderate axial loads in both directions. Manufactured to ABEC1 precision tolerances, this bearing offers a robust and cost-effective solution for general machinery, ensuring smooth operation and long service life. Its open design provides maximum flexibility for various lubrication schemes, making it a cornerstone component for engineers seeking dependable performance.
628 Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning |
|---|---|
| 628 | Standard designation for a metric series, single row deep groove ball bearing with an 8 mm bore, 24 mm OD, and 8 mm width. |
| Open (No Seal Suffix) | Indicates the bearing is unsealed, allowing for high-speed operation and custom lubrication options. Requires external sealing in contaminated environments. |
| ABEC1 | Specifies the precision tolerance class, ensuring consistent dimensional accuracy and running performance for general industrial use. |
| C3 Clearance | Denotes a greater than normal radial internal clearance (0.002mm to 0.013mm), suitable for applications with thermal expansion or where interference fits are used. |
628 Bearing Structural Features & Performance Benefits
- Optimized Internal Geometry: The deep groove raceway and complement of seven precision chrome steel balls enable efficient handling of radial loads and moderate combined loads.
- High-Speed Capability: The lightweight, corrosion-resistant stainless steel cage ensures stable ball guidance and low friction, contributing to the high limiting speed of 28,000 rpm.
- Robust Construction: Made entirely from chrome steel for rings and balls, the bearing provides high load capacity and durability, with a dynamic load rating of 637 lbf and a static load rating of 256 lbf.
- Operational Versatility: The open structure and C3 clearance allow for stable operation across a broad temperature range from -30°C to 110°C, accommodating various thermal conditions.
628 Bearing Typical Application Areas
This versatile ball bearing is widely used across numerous industries due to its standard dimensions and reliable performance. Key applications include:
- Electric Motors and Small Gearboxes
- Office Machinery and Computer Cooling Fans
- Conveyor Idler Rolls and Material Handling Equipment
- Agricultural Machinery and Power Tools
- Medical Devices and Precision Instruments
