SMR31
SMR Series Stainless Steel Miniature Bearings
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Basic Information
Main Dimensions
Inner Ring Dimensions
Ball & Washer Dimensions
Performance
Materials
Environment & Compliance
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SMR31 Bearing Product Overview & Core Advantages
The SMR31 is a metric miniature ball bearing designed for applications requiring compact dimensions and reliable performance. As a single row deep groove ball bearing, it excels in handling radial loads with high efficiency. Constructed entirely from stainless steel, it offers excellent corrosion resistance and is suitable for various industrial environments. With its ABEC1 precision class and optimized internal geometry, this bearing provides smooth operation and consistent performance in precision mechanisms and small electromechanical devices.
SMR31 Bearing Model Code Explained, Specifications & Naming Convention
| Code Element | Technical Meaning |
| SMR | Miniature bearing series designation |
| 31 | Size code indicating 1mm bore, 3mm OD, 1.5mm width |
| Open | No seals or shields, allowing for custom lubrication solutions |
| MC3 | Radial internal clearance group (0.002-0.013mm) |
SMR31 Bearing Structural Features & Performance Benefits
Compact Design Excellence: With dimensions of just 1mm bore × 3mm OD × 1.5mm width, this bearing achieves maximum performance in minimal space, making it ideal for miniature applications where size constraints are critical.
Stainless Steel Construction: All components – rings, balls, and cage – are manufactured from stainless steel, providing superior corrosion resistance and ensuring long-term reliability in harsh environments. This material choice also enables operation across a wide temperature range from -30°C to 110°C.
Optimized Internal Geometry: Featuring 6 precision balls of 0.6mm diameter, the bearing delivers smooth rotation and low noise operation. The MC3 radial clearance (0.002-0.013mm) provides optimal performance for most general applications while accommodating thermal expansion.
High-Speed Capability: With a limiting speed of 117,000 rpm, this bearing supports demanding high-rotation applications. The open design facilitates custom lubrication strategies to maximize performance in specific operating conditions.
SMR31 Bearing Typical Application Areas
- Medical devices and surgical instruments requiring miniature, precision components
- Precision instruments including optical encoders and measuring devices
- Small motors and micro-drive systems in electronics and robotics
- Office automation equipment such as printers, scanners, and copiers
- Aerospace instrumentation and guidance systems where reliability is critical
- Laboratory equipment requiring corrosion-resistant, precision bearings
