Introduction
The 6900 bearing is a single-row deep groove ball bearing known for its thin profile, lightweight design, and high-speed performance. It is commonly used in electric motors, bicycles, robotics, medical equipment, and precision instruments, where compact size, low friction, and high efficiency are required.
At BYWB Bearing, we specialize in manufacturing high-precision 6900 series bearings, ensuring superior quality, durability, and performance for a wide range of applications. Whether you need standard or custom-designed bearings, BYWB Bearing provides the best solutions with competitive pricing and fast delivery.
This article provides an in-depth overview of the 6900 bearing, covering its technical specifications, dimensions, sealing options, quality grades, materials, and application considerations.
1. 6900 Bearing Technical Details
The BYWB 6900 bearing belongs to the thin-section deep groove ball bearing category, offering:
Compact Design: The bearing has a relatively small width-to-diameter ratio, making it ideal for space-constrained applications.
High-Speed Capability: The deep groove design minimizes friction, allowing for smooth rotation at high speeds.
Load Handling: While primarily designed for radial loads, it can also handle moderate axial loads in both directions.
Dynamic Load Rating: 610 lbs (approx. 2,700 N)
Static Load Rating: 290 lbs (approx. 1,300 N)
Maximum Speed (Grease Lubricated): 32,000 RPM
Maximum Speed (Oil Lubricated): 38,000 RPM
Low Noise and Vibration: BYWB 6900 bearings are precision-manufactured to ensure quiet operation, crucial for applications like medical devices and high-end machinery.
2. What Size Is a 6900 Bearing?
The standard dimensions of a BYWB 6900 bearing are:
Inner Diameter (Bore): 10 mm
Outer Diameter: 22 mm
Width: 6 mm
These specifications make BYWB 6900 bearings suitable for high-speed, precision applications where low friction and compact size are essential.
3. 6900 Bearing Sealing Options
BYWB 6900 bearings are available in different sealing configurations, each offering varying levels of protection against contaminants and lubrication retention:
(1) Open Type (No Seal) – 6900
No shields or seals, exposing the bearing balls and raceways.
Best suited for high-speed applications where low friction is critical.
Requires regular lubrication and maintenance to prevent contamination.
(2) Shielded Type (Metal Shields) – 6900Z / 6900ZZ
Comes with one (Z) or two (ZZ) non-contact metal shields.
Protects against larger particles and debris, while maintaining high-speed capability.
Shields do not provide full sealing, so dust and moisture may still enter over time.
(3) Sealed Type (Rubber Seals) – 6900RS / 6900-2RS
Equipped with one (RS) or two (2RS) rubber seals.
Provides better sealing against dust, water, and other contaminants.
Higher friction than shielded types, reducing maximum speed slightly.
Best for harsh environments like outdoor machinery or wet conditions.
4. 6900 Bearing Quality Grades
At BYWB Bearing, we manufacture 6900 bearings in different quality grades to meet specific performance needs.
(1) ABEC Precision Ratings
ABEC 1: Standard precision, suitable for general applications.
ABEC 3: Better accuracy and speed capability.
ABEC 5: High precision, used in electric motors and industrial equipment.
ABEC 7 & 9: Ultra-precision bearings for high-speed aerospace and medical applications.
(2) Noise & Vibration Grades (Z, ZZ, V1-V4)
Z1, Z2, Z3: Higher numbers indicate lower noise.
V1 to V4: Lower vibration with increasing grade.
Low-noise BYWB 6900 bearings are preferred for silent operation in medical and lab equipment.
5. 6900 Bearing Material and How to Choose in Application
BYWB 6900 bearings are made from premium materials to ensure superior performance.
| Material | Properties | Applications |
| Chrome Steel (GCr15 / 52100 Steel) | High hardness, excellent wear resistance | Most industrial and mechanical applications |
| Stainless Steel (440C, 304, 316) | Corrosion-resistant, lower hardness | Food processing, marine, and medical industries |
| Hybrid Ceramic (Steel Rings + Ceramic Balls) | Lower friction, high speed, non-magnetic | Aerospace, racing bicycles, precision instruments |
| Full Ceramic (ZrO2 or Si3N4) | Ultra-lightweight, high temperature resistance | Extreme environments, chemical industries |
(1) Common Materials Used in BYWB 6900 Bearings
(2) How to Choose the Right BYWB 6900 Bearing?
For High-Speed Applications: Choose hybrid ceramic or ABEC 5+ steel bearings.
For Wet & Corrosive Environments: Use stainless steel or full ceramic bearings.
For Heavy Load Applications: Opt for high-carbon chrome steel (GCr15) bearings.
For Silent Operation: Look for Z3/V3 or higher noise/vibration grades.
6. 6900 series bearing size chart
The 6900 series encompasses a range of sizes to accommodate various applications. Below is a table highlighting some common dimensions within this series:
| Bearing Number | Bore Diameter (d) | Outer Diameter (D) | Width (B) |
| 6900 | 10 mm | 22 mm | 6 mm |
| 6901 | 12 mm | 24 mm | 6 mm |
| 6902 | 15 mm | 28 mm | 7 mm |
| 6903 | 17 mm | 30 mm | 7 mm |
| 6904 | 20 mm | 37 mm | 9 mm |
| 6905 | 25 mm | 42 mm | 9 mm |
| 6906 | 30 mm | 47 mm | 9 mm |
| 6907 | 35 mm | 55 mm | 10 mm |
| 6908 | 40 mm | 62 mm | 12 mm |
| 6909 | 45 mm | 68 mm | 12 mm |
| 6910 | 50 mm | 72 mm | 12 mm |
These dimensions are standardized according to DIN 625-1, ensuring compatibility and interchangeability across different manufacturers.
7. Conclusion
The BYWB 6900 bearing is a versatile, high-precision deep groove ball bearing, widely used in precision machinery, robotics, and industrial applications. When selecting a BYWB 6900 bearing, consider:
Technical Specifications (10mm bore, 22mm OD, 6mm width).
Sealing Options (Open, Shielded, or Sealed).
Quality Grades (ABEC, noise/vibration ratings).
Material Selection based on the operating environment.
At BYWB Bearing, we manufacture 6900 bearings with premium materials, strict quality control, and advanced precision engineering. Our bearings ensure long lifespan, smooth operation, and high efficiency, making them the best choice for demanding applications.
Looking for high-quality 6900 bearings? Contact BYWB Bearing today for a customized solution!
