SMR72
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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SMR72 Bearing Product Overview & Core Advantages
The SMR72 is a miniature deep groove ball bearing engineered for precision applications requiring compact design and reliable performance. Constructed entirely from stainless steel, it offers excellent corrosion resistance. As a single row radial bearing, it is optimized to handle primarily radial loads in high-speed scenarios, with a limiting speed of 56,700 rpm. Its small footprint, with a 2 mm bore and 7 mm outside diameter, makes it an ideal choice for space-constrained, high-precision assemblies demanding long service life and consistent operation.
SMR72 Bearing Model Code Explained, Specifications & Naming Convention
The SMR72 model designation follows a standard industry format for miniature bearings. A breakdown of its key characteristics is provided below:
| Code Segment | Technical Meaning |
|---|---|
| SMR | Indicates the manufacturer's series for miniature, stainless steel deep groove ball bearings. |
| 72 | Specifies the bearing size, corresponding to a 2 mm bore, 7 mm outside diameter, and 2.5 mm width. |
| Open (Seal Type) | The bearing is supplied without seals or shields, allowing for higher limiting speeds and ease of re-lubrication, but requiring a clean operating environment. |
SMR72 Bearing Structural Features & Performance Benefits
The design of the SMR72 translates directly into key performance benefits for demanding applications:
- High-Speed Capability: The open design, combined with a stainless steel cage and precision ABEC1 tolerances, minimizes friction and allows for a high limiting speed of 56,700 rpm, making it a capable high-speed bearing.
- Corrosion Resistance: Manufactured entirely from stainless steel (rings, balls, and cage), this bearing is suitable for applications exposed to moisture or corrosive environments, ensuring long-term reliability.
- Precision & Low Noise: The MC3 radial internal clearance and ABEC1 precision class ensure smooth, quiet, and low-vibration operation, which is critical in sensitive instrumentation.
- Radial Load Capacity: As a deep groove ball bearing, it is primarily designed to support significant radial loads (66 lbf dynamic, 21 lbf static) with high efficiency.
SMR72 Bearing Typical Application Areas
The SMR72's combination of miniature size, high-speed performance, and corrosion resistance makes it suitable for a wide range of precision devices, including:
- Small precision motors and stepper motors
- Medical and dental handpieces
- Optical encoders and scanners
- Small fans and blowers
- Radio-controlled models and drones
- Precision instruments and laboratory equipment
