SMR74zz
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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SMR74zz Bearing Product Overview & Core Advantages
The SMR74zz is a miniature deep groove ball bearing engineered for precision applications requiring compact design and reliable performance. As a single row radial bearing with stainless steel construction, it delivers excellent corrosion resistance and durability. Its key advantages include the ability to handle pure radial loads efficiently, making it ideal for high-speed, low-torque operations. The inclusion of stainless steel shields (zz) provides effective contamination protection while maintaining smooth operation. This bearing is designed for applications demanding ABEC1 precision, compact bearing dimensions (4mm bore, 7mm OD, 2.5mm width), and consistent performance in various environmental conditions.
SMR74zz Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Benefit |
|---|---|---|
| SMR | Manufacturer's series designation for miniature bearings | Identifies product family and quality standards |
| 74 | Size designation (4mm bore, 7mm OD, 2.5mm width) | Compact dimensions for space-constrained applications |
| zz | Double-sided stainless steel shields | Contamination protection while maintaining low friction |
SMR74zz Bearing Structural Features & Performance Benefits
Deep Groove Geometry: The optimized raceway design enables efficient radial load distribution across all 11 stainless steel balls, ensuring smooth operation and extended service life.
Full Complement Stainless Steel Construction: All components including rings, balls, cage, and shields are manufactured from stainless steel, providing excellent corrosion resistance and making the bearing suitable for harsh environments and cleanroom applications.
High-Speed Capability: With a limiting speed of 54,000 rpm, the bearing is engineered for high-rotation applications. The stainless steel cage ensures ball stability and uniform spacing at elevated speeds.
Precision Engineering: Manufactured to ABEC1 tolerance class with controlled radial internal clearance (MC3: 0.002-0.013mm), the bearing delivers consistent performance and minimal vibration in precision mechanisms.
Shielded Protection: The double-sided 300 series stainless steel shields provide effective protection against contaminants while allowing for lubrication retention, extending maintenance intervals.
SMR74zz Bearing Typical Application Areas
- Small DC Motors & Stepper Motors: Ideal for spindle support in miniature motors requiring high-speed operation and reliability
- Precision Instruments & Laboratory Equipment: Suitable for optical encoders, measuring devices, and analytical instruments demanding smooth, precise rotation
- Medical Devices: Used in dental handpieces, surgical tools, and diagnostic equipment where corrosion resistance and reliability are critical
- Office Automation Equipment: Applied in printers, scanners, and copiers for paper feed mechanisms and roller assemblies
- Robotics & Automation: Perfect for small robotic joints, actuator systems, and precision positioning mechanisms
- Consumer Electronics: Utilized in small fans, disk drives, and other compact electronic devices requiring quiet, efficient operation
