S691xzz
600 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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S691xzz Bearing Product Overview & Core Advantages
The S691xzz is a miniature deep groove ball bearing engineered for applications demanding high precision and reliable performance in compact spaces. As a single row, shielded bearing, it is optimized for radial loads and offers smooth operation. Its construction from stainless steel throughout provides excellent corrosion resistance, making it suitable for a wide operating temperature range. This bearing is characterized by its extremely small bearing dimensions (1.5mm bore, 5mm OD) and low weight, ideal for miniaturized and sensitive equipment.
S691xzz Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S | Stainless Steel construction |
| 69 | Series designation for ultra-miniature, extra-thin section bearings |
| 1x | Specific bore diameter code (1.5mm in this variant) |
| zz | Indicates the bearing is shielded on both sides (2Z). This provides effective protection against contamination while allowing for high-speed operation. |
S691xzz Bearing Structural Features & Performance Benefits
Compact and Lightweight Design: With a width of only 2.6mm and a weight of 0.25g, this bearing is a premier solution for space-constrained and weight-sensitive applications.
Shielded Protection: The non-contact stainless steel shields (2Z) help retain lubricant and exclude larger particulate contaminants, enhancing bearing life and reliability without significantly increasing rotational torque.
High-Speed Capability: The combination of a stainless steel cage, six precision balls, and optimized internal geometry contributes to a high limiting speed of 76,500 rpm, making it a capable high-speed bearing.
Corrosion Resistance: Manufactured entirely from stainless steel (rings, balls, cage, and shields), this bearing is inherently resistant to rust and corrosion, suitable for use in harsh or washdown environments.
Precision Grade: Manufactured to ABEC1 tolerance class, ensuring consistent running accuracy and smooth operation for general precision applications.
S691xzz Bearing Typical Application Areas
The S691xzz is ideally suited for a wide range of miniature and precision instruments, including:
- Small DC and stepper motors
- Medical devices and dental handpieces
- Optical encoders and scanners
- Precision gearboxes and mechanisms
- Small drones and RC models
- Instrumentation and laboratory equipment
