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The 688 deep groove ball bearing is a compact, high-speed miniature bearing engineered for precision applications requiring low noise, stable rotation, and long service life. Available in open, shielded (ZZ), and sealed (2RS) variants, it delivers reliable performance in space-constrained environments.
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The 688 Deep Groove Ball Bearing is meticulously crafted to transform how miniature mechanisms operate under the most demanding industrial conditions. When you handle this bearing, the flawless, mirror-like finish of the premium chrome steel immediately communicates a profound sense of industrial-grade durability and precision manufacturing. Designed specifically to resolve the persistent challenge of friction in space-constrained assemblies, it ensures your electric motors, precision instruments, and automation components glide with a whisper-quiet smoothness. By drastically minimizing rotational resistance and dampening internal vibration, this component significantly extends the operational lifespan of your end products, reducing the frequency of maintenance cycles and costly part replacements. The seamless integration of this bearing into your mechanical architecture means less heat generation and more consistent power transmission, directly enhancing the overall reliability of your equipment. Whether operating in high-speed consumer electronics or rigorous automated conveyor systems, the structural integrity of this bearing guarantees a stable, uninterrupted performance that ultimately elevates your production standards and operational efficiency.
Parameter | Value | Description |
Bearing Model | 688 | Deep Groove Ball Bearing |
Inner Diameter (d) | 8 mm | Shaft diameter |
Outer Diameter (D) | 16 mm | Housing bore diameter |
Width (B) | 5 mm | Bearing width |
Chamfer (r min) | 0.3 mm | Minimum chamfer size |
Item | Specification |
Bearing Type | Deep Groove Ball Bearing |
Precision Grade | ABEC-1 / ABEC-3 / ABEC-5 |
Noise Level | Z1 / Z2 (low noise) |
Sealing Type | Open / ZZ / 2RS |
Material | Chrome Steel (GCr15) / Stainless Steel |
Cage Material | Steel / Nylon |
Lubrication | Grease or Oil |
Operating Temperature | -20°C to +120°C |
Load Type | Value |
Dynamic Load Rating (Cr) | Approx. 1.45 kN |
Static Load Rating (Cor) | Approx. 0.60 kN |
Note:Load ratings may vary slightly depending on bearing clearance, material selection, and lubrication conditions.
Bearing Version | Max Speed |
Open Type | ~34,000 RPM |
| Metal Shield (ZZ) | ~28,000 RPM |
| Rubber Seal (2RS) | ~20,000 RPM |
688 – Open type
688ZZ – Double metal shields
688-2RS / 688-2RS1 – Double rubber seal
Engineered for absolute excellence, our bearings are designed to elevate your mechanical assemblies through superior craftsmanship, unwavering reliability, and intelligent design.
Precision-ground raceways ensure a frictionless glide, drastically reducing mechanical wear over prolonged and intensive usage.
Controlled heat treatment hardens the steel matrix, fortifying the core against heavy continuous loads without deformation.
Strict dimensional tolerances guarantee a flawless drop-in fit for rapid, uninterrupted assembly lines, saving valuable production time.
Engineered for whisper-quiet rotation, eliminating disruptive acoustic feedback in sensitive acoustic environments like office equipment and medical devices.
Maintains structural composure and dimensional stability during prolonged high-speed cycles, preventing overheating and system failures.
Extended service intervals keep your machinery running longer, maximizing output and minimizing the total cost of ownership.
Our 688 series is built upon a foundation of rigorous engineering standards, ensuring that every dimension, material, and configuration perfectly aligns with your specific application requirements.
By strictly controlling the 8x16x5mm standard dimensional tolerances, we allow for flawless integration into micro-motors and precision instruments. Offering multiple precision grades from ABEC-1 to ABEC-5, this component ensures perfect assembly and high-accuracy rotation in severely space-restricted applications.
The core architecture utilizes premium Chrome Steel (GCr15) or stainless steel. Combined with precision grinding and controlled heat treatment, this grants the bearing exceptional wear resistance and anti-fatigue properties, safeguarding ultra-long service life during continuous, high-intensity operations.
Available in Open, ZZ (double metal shields), and 2RS (double rubber seals) variants. Procurement teams can flexibly select the ideal configuration based on specific requirements for dust prevention, water resistance, or internal grease retention, easily adapting to complex and harsh industrial environments.
Specifically tailored for high-speed miniature equipment, the open variant achieves an impressive maximum speed of 34,000 RPM. Simultaneously meeting Z1 and Z2 low-noise standards, it operates with profound smoothness and minimal vibration, making it the perfect choice for consumer electronics, office equipment, and automated conveyor parts.
We provide comprehensive customization ranging from radial clearance (C0/C2/C3) and specialized lubrication to specific material selections. Supporting laser marking, exclusive brand packaging, and application-level performance optimization, we fulfill the personalized manufacturing and global branding needs of diverse industries.
Supplied directly from the source factory, eliminating intermediary layers to offer highly competitive pricing structures. Equipped with the flexible production capacity to handle both massive volume procurement and smaller specialized runs, we ensure stable lead times, optimizing your supply chain costs and mitigating the risk of stock shortages.
Selecting the right manufacturing partner is crucial for maintaining the integrity and profitability of your production lines. We bring decades of engineering expertise and supply chain mastery directly to your doorstep.
Direct Source Advantage: By bypassing intermediaries, we deliver premium components directly from our manufacturing floors to your assembly lines, ensuring strict quality oversight and highly favorable pricing models.
Scalable Production Capabilities: Whether you require a specialized pilot run for a new prototype or continuous high-volume deliveries, our agile manufacturing facilities adapt instantly to your shifting procurement schedules.
Rigorous Quality Assurance: Every single batch undergoes stringent acoustic, dimensional, and metallurgical testing to ensure absolute uniformity, meaning zero surprises when the components reach your facility.
Dedicated Engineering Support: Our technical teams collaborate directly with your designers to recommend the exact clearances, seals, and lubricants needed to optimize your specific mechanical applications.
Find detailed answers to common engineering and procurement inquiries regarding our 688 deep groove ball bearing series to help you make informed sourcing decisions.
We offer highly customized lubrication solutions, including specialized high-temperature synthetic greases. These advanced lubricants maintain their viscosity and prevent metal-to-metal contact in environments exceeding standard operational thresholds, ensuring uninterrupted performance and preventing premature bearing failure.
The ZZ variant utilizes double metal shields, providing excellent protection against larger particulates while allowing for higher rotational speeds (up to 28,000 RPM) due to lower friction. The 2RS variant features double rubber seals, creating a much tighter barrier against fine dust and moisture, though it operates at a slightly lower maximum speed (20,000 RPM) due to the intentional seal friction.
Absolutely. We supply ABEC-1 for standard, cost-effective applications, ABEC-3 for enhanced rotational smoothness, and ABEC-5 for ultra-precise, high-speed electric motors where minimizing runout and vibration is absolutely critical to the final product's success.
Because we operate as a direct manufacturer with highly optimized production lines, standard configurations are often ready for immediate dispatch. For highly customized OEM orders, our agile manufacturing process ensures stable and predictable lead times, which our commercial team will outline and commit to during the initial consultation.
To preserve the factory-applied lubrication and prevent micro-corrosion, components should always be stored in their original anti-rust packaging. We recommend a climate-controlled environment, kept strictly away from direct moisture, extreme temperature fluctuations, and heavy ambient vibrations to ensure they perform perfectly upon installation.
