Products
68 Series Deep Groove Ball Bearings
Product Overview
The 68 Series Deep Groove Ball Bearings are the most widely used series within the deep groove ball bearing family. Offering a balanced combination of load capacity, speed capability, and dimensional versatility, the 62 Series serves as the industry standard for general-purpose applications across a broad range of industries.
With a larger cross-section compared to the 60 Series, the 62 Series accommodates bigger rolling elements, resulting in higher dynamic and static load ratings while maintaining reliable performance at moderate to high speeds. Available in precision grades from P0 to P5 to meet the requirements of both standard industrial and higher-precision applications.
Sealing options include open type, single and double-sided metal shields (Z/ZZ), non-contact seals (RZ/2RZ), contact seals (RS/2RS), and mid-contact seals (RS1/2RS1), allowing flexible selection based on the specific requirements for dust protection, moisture resistance, and friction loss in different operating environments.
Technical Specifications
| Bearing No. | d (mm/in) | D (mm/in) | Open B (mm/in) | Sealed B (mm/in) | Cr (kN) | C0r (kN) | Grease (rpm) | Oil (rpm) | Ball Qty. | Ball Dia. (mm) | Weight (kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 685 | 5 / 0.1969 | 11 / 0.4331 | 3 / 0.1181 | 5 / 0.1969 | 0.715 | 0.282 | 46000 | 54000 | 8 | 1.588 | 0.0024 |
| 686 | 6 / 0.2362 | 13 / 0.5118 | 3.5 / 0.1378 | 5 / 0.1969 | 1.080 | 0.440 | 40000 | 50000 | 8 | 2.000 | 0.0027 |
| 687 | 7 / 0.2756 | 14 / 0.5512 | 3.5 / 0.1378 | 5 / 0.1969 | 1.170 | 0.510 | 39000 | 49000 | 9 | 2.000 | 0.0030 |
| 688 | 8 / 0.3149 | 16 / 0.6299 | 4 / 0.1575 | 5 / 0.1969 | 1.330 | 0.585 | 37000 | 45000 | 9 | 2.381 | 0.0040 |
| 689 | 9 / 0.3543 | 17 / 0.6693 | 4 / 0.1575 | 5 / 0.1969 | 1.720 | 0.820 | 35000 | 42000 | 11 | 2.000 | 0.0040 |
| 6800 | 10 / 0.3937 | 19 / 0.7480 | 5 / 0.1969 | 5 / 0.1969 | 1.830 | 0.925 | 33000 | 40000 | 9 | 2.381 | 0.0050 |
| 6800W7 | 10 / 0.3937 | 19 / 0.7480 | 7 / 0.2756 | 7 / 0.2756 | 1.830 | 0.925 | 33000 | 40000 | 9 | 2.381 | 0.0060 |
| 6801 | 12 / 0.4724 | 21 / 0.8268 | 5 / 0.1969 | 5 / 0.1969 | 1.920 | 1.040 | 32000 | 38000 | 12 | 2.381 | 0.0060 |
| 6802 | 15 / 0.5906 | 24 / 0.9449 | 5 / 0.1969 | 5 / 0.1969 | 2.080 | 1.260 | 28000 | 32000 | 14 | 2.381 | 0.0070 |
| 6803 | 17 / 0.6693 | 26 / 1.0236 | 5 / 0.1969 | 5 / 0.1969 | 2.810 | 1.720 | 25000 | 30000 | 15 | 2.381 | 0.0080 |
| 6804 | 20 / 0.7874 | 32 / 1.2598 | 7 / 0.2756 | 7 / 0.2756 | 4.010 | 2.470 | 23000 | 28000 | 13 | 3.500 | 0.0150 |
| 6805 | 25 / 0.9843 | 37 / 1.4567 | 7 / 0.2756 | 7 / 0.2756 | 4.310 | 2.950 | 18000 | 23000 | 15 | 3.500 | 0.0200 |
| 6806 | 30 / 1.1811 | 42 / 1.6535 | 7 / 0.2756 | 7 / 0.2756 | 4.700 | 3.620 | 16000 | 19000 | 18 | 3.500 | 0.0250 |
| 6807 | 35 / 1.3780 | 47 / 1.8504 | 7 / 0.2756 | 7 / 0.2756 | 4.900 | 4.050 | 13000 | 17000 | 22 | 3.175 | 0.0290 |
| 6808 | 40 / 1.5748 | 52 / 2.0472 | 7 / 0.2756 | 7 / 0.2756 | 5.100 | 4.400 | 12000 | 15000 | 24 | 3.175 | 0.0330 |
| 6809 | 45 / 1.7717 | 58 / 2.2835 | 7 / 0.2756 | 7 / 0.2756 | 6.400 | 6.100 | 11000 | 13000 | 27 | 3.175 | 0.0400 |
| 6810 | 50 / 1.9685 | 65 / 2.5591 | 7 / 0.2756 | 7 / 0.2756 | 6.670 | 6.800 | 9600 | 11000 | 24 | 3.969 | 0.0520 |
Key features
- Slim cross-section — minimizes axial and radial installation space while maintaining stable rotation
- Lightweight design — reduces overall assembly weight, beneficial for portable and small-scale equipment
- Bore size range — typically from 8 mm (688) to 110 mm (6822), covering small-to-medium shaft diameters
- Suitable for high-speed, light-to-moderate load applications
- Compliant with ISO 15 and DIN 625 standards
Applications
In small electric motors and micro-motors, the 68 Series provides reliable radial support within confined housing dimensions, commonly used in fans, pumps, and household appliance motors.
In office and precision equipment such as printers, scanners, and copiers, the series supports smooth, low-noise rotation required for accurate mechanical movement.
In computer peripherals and electronics, including cooling fans and disk drive components, the 68 Series enables compact assembly without compromising rotational stability.
In instrumentation and measurement devices, its slim profile and consistent performance make it suitable for gauges, sensors, and other precision mechanisms where space constraints are critical.
The 68 Series is also widely used in toys, hobby equipment, and small consumer appliances, where a cost-effective, space-saving bearing solution is required for light-duty rotational applications.
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Technical Resources
Whether you are an engineer, procurement manager, or equipment maintenance professional, here you will find in-depth content covering bearing operating principles, technical parameter interpretation, industry application analysis, and selection logic — helping you build a comprehensive understanding of bearing products and make more informed decisions in real-world applications.
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FAQs
What loads can deep groove ball bearings handle?
Deep groove ball bearings are primarily designed for radial loads, but they can also handle moderate axial (thrust) loads in both directions. They are not suitable for heavy axial loads or combined shock loads. In those cases, angular contact or tapered roller bearings are preferred.
How do I select the right bearing size for my application?
Selection should be based on bore diameter (shaft size), required load capacity (dynamic rating C and static rating C0), operating speed compared with the bearing limiting speed, available space (outer diameter and width), and required precision grade from P0 to P2. Always apply a safety factor and verify that the calculated L10 service life meets your requirements.
What is the difference between open, shielded (ZZ), and sealed (2RS) bearings?
Open: No built-in protection, requires external sealing, and is suitable for clean environments or oil bath lubrication.
ZZ metal shields: Protect against dust and debris with low friction, making them suitable for high-speed applications, but they are not waterproof.
2RS rubber seals: Provide strong protection against dust and moisture. They are pre-greased and ideal for contaminated environments, but generate slightly more friction.
How often should I lubricate or replace the grease?
For general industrial use, grease should be replenished or replaced every 3,000 to 10,000 operating hours depending on speed, temperature, and environmental conditions. Bearings running above 70 C or in contaminated environments require shorter intervals. Sealed 2RS bearings are pre-greased for life and do not require re-lubrication.
What are the common causes of premature bearing failure?
The most frequent causes include inadequate or improper lubrication, contamination by dirt, dust, or moisture, incorrect installation, misalignment, excessive force during fitting, overloading beyond the rated capacity, improper shaft or housing fits, and fatigue at the end of normal service life.
How is the rated service life (L10) of a bearing calculated?
The basic L10 life is calculated as L10 = (C / P)^3 x 10^6 revolutions, where C is the dynamic load rating in kN and P is the equivalent dynamic bearing load in kN. It represents the number of revolutions that 90% of identical bearings will complete without fatigue failure. In practice, ISO 281 modified life calculations also apply correction factors for lubrication, contamination, material, and reliability.
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