687zz
600 Series Miniature Bearings
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Basic Information
Main Dimensions
Inner Ring Dimensions
Ball & Washer Dimensions
Performance
Materials
Environment & Compliance
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687zz Bearing Product Overview & Core Advantages
The 687zz is a metric, single row deep groove ball bearing designed for reliable performance in compact spaces. Its key advantage lies in its ability to efficiently handle radial loads while offering a cost-effective solution for a wide range of applications. Featuring shielded construction on both sides, this bearing is pre-lubricated for initial operation and helps protect against contamination. Manufactured to ABEC1 precision tolerances, it provides a dependable balance of performance and value, making it an excellent choice for high-volume, general-purpose use where consistent operation is required.
687zz Bearing Model Code Explained, Specifications & Naming Convention
The model number 687zz is decoded as follows:
- 687: The basic bearing designation, defining the standard metric dimensions (7mm bore, 14mm OD, 5mm width).
- zz: Indicates the bearing is equipped with non-contact metal shields (ZZ) on both sides. These shields help retain lubrication and protect the internal components from large particulate contaminants without significantly increasing rotational friction.
687zz Bearing Structural Features & Performance Benefits
The performance of the 687zz is a direct result of its robust construction and material selection.
- Optimized Load Capacity: The deep groove raceway and complement of nine precision chrome steel balls enable it to carry a dynamic radial load of 224 lbf and a static radial load of 92 lbf.
- Stainless Steel Cage & Shields: The stainless steel cage ensures stable ball guidance and is resistant to corrosion. Combined with 300 series stainless steel shields, this enhances the bearing's durability in various environments.
- Balanced Speed Performance: With a limiting speed of 40,000 rpm, it is suitable for a variety of high-speed applications. The non-contact shields and optimized internal geometry contribute to low friction and heat generation.
- Standard Internal Clearance: The specified MC3 radial internal clearance (0.002mm to 0.013mm) is suitable for most common operating conditions, providing a stable and predictable running performance.
687zz Bearing Typical Application Areas
The 687zz bearing is a versatile component found in numerous precision devices and small machinery, including:
- Small electric motors and gearmotors
- Precision spindles in dental handpieces and small tools
- Computer cooling fans and small blowers
- Office automation equipment (printers, scanners)
- Radio-controlled models and drones
- Medical and laboratory instrumentation
