SR4
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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SR4 Bearing Product Overview & Core Advantages
The SR4 series represents a high-precision single row deep groove ball bearing engineered for demanding industrial applications. Manufactured entirely from stainless steel (rings, balls, and cage), this bearing offers excellent corrosion resistance and reliable performance. Its open design allows for versatile lubrication options, making it suitable for a wide operating temperature range from -86 to 230 °F. With an ABEC1 precision class and optimized internal geometry, it delivers smooth operation and is ideal for applications requiring high-speed capability (up to 34,200 rpm) and consistent radial load handling.
SR4 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| SR4 | Series Designation | Identifies this specific inch-dimension bearing series with a 0.25" bore. |
| Open | Seal Type | No integral seals or shields, allowing for custom lubrication and high-speed operation. |
| MC3 | Radial Internal Clearance | Specifies a standard clearance group (0.00008" to 0.0005"), suitable for most general applications. |
SR4 Bearing Structural Features & Performance Benefits
Optimized Single Row Design: The deep groove raceway and complement of eight precision-ground balls enable efficient radial load support (255 lbf dynamic / 101 lbf static rating). The geometry minimizes friction, contributing to the high limiting speed.
Full Stainless Steel Construction: All critical components—inner ring, outer ring, balls, and stainless steel cage—are manufactured from corrosion-resistant stainless steel. This ensures long-term reliability in harsh environments and prevents galvanic corrosion.
Precision Engineering: Built to ABEC1 tolerance class with tight dimensional control on the bore diameter (0.25" ±0.0003"), outside diameter (0.625" ±0.0003"), and width (0.196" -0.005"/0"). This guarantees consistent performance and easy installation.
Flexible Lubrication: The open structure allows engineers to select the optimal lubricant for specific speed, temperature, and life requirements, maximizing application performance.
SR4 Bearing Typical Application Areas
- Precision Instruments: Medical devices, optical encoders, and laboratory equipment where corrosion resistance and smooth operation are critical.
- High-Speed Spindles: Small electric motors, dental handpieces, and spindle drives benefiting from the 34,200 rpm speed capability.
- Food & Beverage Machinery: Conveyor systems and pumps where stainless steel's corrosion resistance and compliance with hygiene standards are required.
- Office Automation Equipment: High-duty printers, scanners, and copiers that demand reliable, long-life ball bearing performance.
