SR1
SR 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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SR1 Bearing Product Overview & Core Advantages
The SR1 series miniature bearing represents a high-precision single row deep groove ball bearing engineered for demanding applications requiring exceptional reliability and performance. Designed with a compact inch dimension configuration (0.05556" bore × 0.1875" OD × 0.0781" width), this bearing delivers robust radial load capacity with a dynamic rating of 40 lbf. Manufactured entirely from stainless steel (rings, balls, and cage), it offers superior corrosion resistance and is ideal for applications where lubrication is managed externally. Its ABEC1 precision class and controlled MC3 radial internal clearance ensure smooth, low-vibration operation, making it an excellent choice for high-speed applications up to 81,000 rpm.
Model Code Technical Breakdown
| Feature | Designation | Technical Significance |
|---|---|---|
| Seal Type | Open | No integral seals; allows for custom lubrication schemes and minimizes torque for ultra-high-speed operation. |
| Precision Class | ABEC1 | Defines dimensional and running accuracy tolerances for reliable performance. |
| Internal Clearance | MC3 | Specifies a greater-than-normal radial internal clearance (0.00008" to 0.0005"), suitable for applications with thermal expansion or where a specific preload is not required. |
| Lubrication | Required | Bearing is supplied without grease, providing flexibility for application-specific lubrication selection to optimize for temperature range (-86 to 230 °F) and speed. |
SR1 Bearing Structural Features & Performance Benefits
All-Stainless-Steel Construction: The use of stainless steel for all critical components (rings, 6 precision balls with a diameter of 0.03941", and cage) ensures excellent corrosion resistance and compatibility with various chemicals and environments, contributing to long service life.
Optimized for High Speeds: The open design, combined with the stainless steel cage and the specified MC3 clearance, minimizes friction and allows this miniature bearing to achieve its remarkable limiting speed of 81,000 rpm under appropriate lubrication and cooling conditions.
Precision Engineering: The ABEC1 tolerance class guarantees tight control over bore, outside diameter, and width dimensions, resulting in consistent performance, reduced vibration, and precise shaft positioning.
Radial Load Performance: The deep groove raceway and robust construction are designed to efficiently handle the specified radial dynamic and static loads, providing reliable support in compact spaces.
SR1 Bearing Typical Application Areas
- Precision Instrumentation: Optical encoders, medical devices, and laboratory equipment.
- Small High-Speed Motors: Spindle motors for drones, dental handpieces, and miniature DC motors.
- Office Automation Equipment: High-speed scanners, printers, and copiers.
- Radio-Controlled Models: High-performance servos, drone propulsion systems.
- Flow Meters and Pumps: Small industrial and medical pumps requiring corrosion resistance.
