Products
63 Series Deep Groove Ball Bearings
Product Overview
The 63 Series Deep Groove Ball Bearings belongs to the “wide series” within the deep groove ball bearing family, characterized by a larger cross-section designed specifically for medium-to-heavy load applications. Compared to the 62 Series, the 63 Series incorporates larger rolling elements and wider raceway space at the same bore size, resulting in higher dynamic and static load ratings while still maintaining stable performance across moderate to high speed ranges — making it the preferred series for applications with elevated load requirements.
Precision grades from P0 to P5 are available, meeting requirements ranging from standard industrial applications to higher-precision rotational support needs. Sealing options are equally comprehensive, including 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 dust protection, moisture resistance, and friction loss requirements across different operating conditions.
Technical Specifications
| Bearing No. | d (mm) | d (inch) | D (mm) | D (inch) | B (mm) | B (inch) | Cr (kN) | C0r (kN) | Grease Speed (rpm) | Oil Speed (rpm) | Ball Qty. | Ball Dia. (mm) | Weight (lbs) | Weight (kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 635 | 5 | 0.1969 | 19 | 0.7480 | 6 | 0.2362 | 2.340 | 0.950 | 34000 | 42000 | 9 | 2.381 | 0.0242 | 0.011 |
| 636 | 6 | 0.2362 | 22 | 0.8661 | 7 | 0.8661 | 2.550 | 1.370 | 32000 | 38000 | 7 | 3.696 | 0.0308 | 0.014 |
| 637 | 7 | 0.2756 | 26 | 1.0236 | 9 | 0.3543 | 3.500 | 2.780 | 30000 | 36000 | 7 | 4.763 | 0.0550 | 0.025 |
| 638 | 8 | 0.3149 | 28 | 1.1024 | 9 | 0.3543 | 3.540 | 1.990 | 28000 | 32000 | 7 | 4.763 | 0.0638 | 0.029 |
| 639 | 9 | 0.3543 | 30 | 1.1811 | 10 | 0.3937 | 3.930 | 2.230 | 25000 | 30000 | 8 | 4.763 | 0.0792 | 0.036 |
| 6300 | 10 | 0.3937 | 35 | 1.3780 | 11 | 0.4331 | 7.650 | 3.470 | 23000 | 27000 | 7 | 6.350 | 0.1188 | 0.054 |
| 6301 | 12 | 0.4724 | 37 | 1.4567 | 12 | 0.4724 | 7.690 | 3.500 | 21000 | 25000 | 7 | 6.350 | 0.1298 | 0.059 |
| 6302 | 15 | 0.5906 | 42 | 1.6535 | 13 | 0.5118 | 11.450 | 5.430 | 19000 | 22000 | 7 | 7.938 | 0.1804 | 0.082 |
| 6303 | 17 | 0.6693 | 47 | 1.6535 | 14 | 0.5512 | 13.580 | 6.580 | 16000 | 19000 | 7 | 8.731 | 0.2486 | 0.113 |
| 6304 | 20 | 0.7874 | 52 | 2.4072 | 15 | 0.5906 | 15.940 | 7.880 | 14000 | 17500 | 7 | 9.525 | 0.3124 | 0.142 |
| 6305 | 25 | 0.9843 | 62 | 2.4409 | 17 | 0.6693 | 22.410 | 11.510 | 12000 | 14000 | 7 | 11.509 | 0.4972 | 0.226 |
| 63/28 | 28 | 1.1024 | 68 | 2.6772 | 18 | 0.7087 | 24.960 | 13.830 | 11000 | 13000 | 8 | 11.509 | 0.6512 | 0.296 |
| 6306 | 30 | 1.1811 | 72 | 2.8346 | 19 | 0.7480 | 27.030 | 15.260 | 10000 | 12000 | 8 | 12.000 | 0.7678 | 0.349 |
| 6307 | 35 | 1.3780 | 80 | 3.1496 | 21 | 0.8268 | 33.390 | 19.290 | 8800 | 10000 | 8 | 13.494 | 1.0120 | 0.460 |
| 6308 | 40 | 1.5748 | 90 | 3.5433 | 23 | 0.9055 | 40.760 | 24.010 | 7800 | 9200 | 8 | 15.081 | 1.4190 | 0.645 |
| 6309 | 45 | 1.7717 | 100 | 3.9370 | 25 | 0.9843 | 48.890 | 29.560 | 7000 | 8200 | 8 | 16.669 | 1.8524 | 0.842 |
| 6310 | 50 | 1.9685 | 110 | 4.3307 | 27 | 1.0630 | 57.540 | 35.340 | 6400 | 7500 | 8 | 18.256 | 2.3892 | 1.086 |
Key features
- Larger cross-section design — delivers higher load capacity compared to the 62 Series, suitable for medium-to-heavy duty applications
- Higher dynamic load rating at the same bore size — accommodates greater radial and bidirectional axial loads within the same mounting dimensions
- Wide bore size range — from 10 mm (6300) to 130 mm (6326), covering a broad range of shaft diameters
- Compatible with multiple lubrication methods — supports both grease and oil lubrication
- Compliant with international standards — meets ISO 15, DIN 625, and ABEC standard requirements
Applications
In electric motors and generators, the 63 Series’ enhanced load capacity makes it well-suited for higher-power, heavier-duty motor models, providing stable radial and axial support under continuous operating conditions.
In pumps and compressors, the series maintains reliable performance under continuous radial loading and harsher operating environments, making it suitable for applications where downtime sensitivity and high reliability are critical.
In gearboxes and power transmission systems, the 63 Series withstands the combined radial and axial loads generated by gear meshing, providing stable support across medium-to-large shaft diameter ranges, and is commonly used in transmission components subject to more demanding load conditions.
Conveyor and material handling equipment benefit from the series’ higher load capacity and extended service life under continuous duty cycles and heavy-load conditions.
In construction machinery and heavy-duty equipment, the 63 Series is widely used in applications with complex operating conditions and fluctuating loads, owing to its excellent load resistance and strong contamination resistance when used in sealed configurations.
In addition, the 63 Series is commonly found in wind power equipment, metallurgical machinery, and mining machinery, where higher load capacity margins are required — serving as a common upgrade or alternative solution when load demands exceed the capacity range of the 62 Series.
Electric Tools
- Read More
Automotive
- Read More
Machine Tools
- Read More
Agriculture Machinery
- Read More
Food and Beverage
- Read More
Robotics
- Read More
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.
Electric Motors
- Read More
Electric Motors
- Read More
Electric Motors
- Read More
Electric Motors
- Read More
Related Products
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.
Get a Fast Response from Our Team
Share your bearing requirements or project details ??our team will review your inquiry and respond with the right product recommendations and pricing.
ETERNUM POWER TECHNOLOGY