618/8
618 & 619 Series Thin Section Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
618/8
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.003 kg
Tolerance class
P6
Seal type
Open
For load direction
Radial
Main Dimensions
Bore diameter
8 mm
Bore diameter tolerance
-0.007mm to 0
Outside diameter
16 mm
Outside diameter tolerance
-0.007mm to 0
Width
4 mm
Width tolerance
-0.12mm to 0
Performance
Temperature range
-30° to 120 °C
Radial dynamic load rating
184 lbf
Radial static load rating
67 lbf
Limiting speed
56 X 1000 rpm
Lubrication
None
Radial internal clearance
CN
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:
$ 9.56
/ each
In Stock
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618/8 Bearing Product Overview & Core Advantages
The 618/8 is a miniature deep groove ball bearing designed for applications demanding compact size, high precision, and reliable performance. As a single row bearing with an open design, it excels in handling primarily radial loads. Its metric dimensions and P6 tolerance class ensure high running accuracy, making it an ideal choice for high-speed, precision mechanisms where space is at a premium.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 618 | Series designation for extra small, thin-section deep groove ball bearings. |
| 8 | Nominal bore diameter in millimeters (8 mm). |
| (Open) | No seals or shields, allowing for higher speeds and custom lubrication. |
| P6 | Tolerance class indicating higher precision than standard (Normal class). |
| CN | Standard radial internal clearance for normal operating conditions. |
618/8 Bearing Structural Features & Performance Benefits
- High-Speed Capability: The open construction and lightweight stainless steel cage minimize friction and allow for a high limiting speed of 56,000 rpm, making it suitable for demanding rotational applications.
- Precision & Rigidity: Manufactured to P6 tolerance with tight dimensional control on the bore diameter, outside diameter, and width, this bearing provides precise shaft guidance and consistent performance.
- Robust Material Construction: Components made from chrome steel for rings and balls offer high wear resistance and durability, supporting a dynamic load rating of 184 lbf and a static load rating of 67 lbf.
- Flexible Lubrication: The open design allows for the application of specialized lubricants tailored to specific operational needs, such as extreme temperatures ranging from -30°C to 120°C.
618/8 Bearing Typical Application Areas
This miniature bearing is engineered for compact and high-precision devices, including:
- Small electric motors and spindles
- Precision instruments and optical encoders
- Office automation equipment (e.g., printers, scanners)
- Medical and dental handpieces
- Robotics and miniature gearboxes
