MR72zz
MR Series Miniature Bearings
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Basic Information
Main Dimensions
Inner Ring Dimensions
Ball & Washer Dimensions
Performance
Materials
Environment & Compliance
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MR72zz Bearing Product Overview & Core Advantages
The MR72zz is a metric miniature ball bearing engineered for precision applications requiring compact dimensions and reliable performance. As a single row deep groove ball bearing, it is primarily designed to support radial loads efficiently. Its shielded construction (2Z) provides effective protection against contamination while retaining lubrication, making it suitable for high-speed operation and applications demanding long-term reliability with minimal maintenance.
MR72zz Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| MR72 | Bearing series designation, indicating a metric miniature bearing with a 2mm bore and 7mm outside diameter. |
| zz | Denotes double-shielded construction on both sides. This provides superior protection against dust and debris, retaining lubricant for extended service life. |
MR72zz Bearing Structural Features & Performance Benefits
Compact & Robust Design: With ultra-small dimensions of 2mm (bore) x 7mm (OD) x 3mm (width), this bearing is ideal for space-constrained applications. The deep groove raceway and stainless steel cage ensure smooth operation and stable guidance of the balls.
High-Speed Capability: The combination of the stainless steel cage and optimized internal geometry allows for a high limiting speed of 65,000 rpm, making it an excellent high-speed bearing for miniature machinery.
Enhanced Service Life: The double shields (zz) effectively protect the chrome steel components from contaminants, while the specified MC3 radial internal clearance (0.002mm to 0.013mm) ensures optimal performance under various operating conditions and temperatures (-30° to 110 °C).
MR72zz Bearing Typical Application Areas
This precision miniature bearing is widely used in:
- Small Precision Motors (e.g., drone motors, stepper motors)
- Medical and Dental Handpieces
- Office Automation Equipment (e.g., printers, scanners)
- Instrumentation and Gauges
- RC Models and Miniature Robotics
