638 deep groove ball bearing specification
Deep Groove Ball Bearings No. | I.D | O.D | B | |||
d | d | Open type | ||||
mm | inch | mm | inch | mm | inch | |
638 | 8 | 0.3150 | 28 | 1.1024 | 9 | 0.3543 |
Deep Groove Ball Bearings No. | B | Load Rating(KN) | Steel Ball Parameter | |||
Closed type | Dynamic | Static | No. | Size | ||
mm | inch | Cr | Cor | mm | ||
638 | 9 | 0.3543 | 4.16 | 1.78 | 7 | 4.763 |
Deep Groove Ball Bearings No. | Max speed | Weight Kg | ||||
Grease | Oil | |||||
r/min | r/min | |||||
638 | 22000 | 30000 | 0.0303 |
Increased vibration levels and countermeasures of 638 bearing
NSAR conducts 100% noise and vibration testing on every product that leaves the factory. At the same time, NSAR has recently significantly improved the design of deep groove ball bearings, further reducing vibration and noise levels. Once encountering the following situation, customers need to pay attention.
Application of 638 bearing:
NSAR are widely used in household appliance. micro-motors electrical tools garden machinery, motorcycles,automobiles,medical equipment, sports machinery, textile machinery and agricultural machinery.
Advantages of 638 bearings:
The bearings we manufacture are all low noise,low vibration,low friction, high precision, high sealed,high turning speed and long life.
Quality assurance certificate of 638 deep groove ball bearings:
Quality is the key point for the NSAR. bearing’s growth and development, which always regards the improvement of high quality and service as the long-term-development strategy. NSAR has passed IS09001: 2000, 1S09001: 2008, and will struggle for the NSAR in long term.
NSAR can satisfy your bulk deep groove ball bearing customization needs,We provide 6012 bearing,please contact NSAR wholesale factory for more details.
Increased vibration levels and countermeasures
Type | Describe | Reason | Targeted Measures |
Vibrate by itself | During the rotation process, the bearing itself the vibration produced | Bearing steel balls and raceways have changes in roundness | Cannot be ignored, but can reduce vibration by selecting the correct clearance for the application |
Caused by exposed bearings vibration | Irregular noise occurs as bearing performance degrades, mostly due to wear, oxidation or corrosion. | Contamination from the surrounding environment affects the bearings. Bearings running under load are not adequately lubricated with grease | These conditions can be eliminated by properly designing the isolation section and providing adequate lubrication |
Vibrations caused by misalignment | Misaligned bearings produce noise during rotation | The bearing is not well aligned with the shaft or housing when installed/the shaft and housing are not precise enough. | Good alignment methods and special alignment tools reduce vibration/use high-precision shafts and bearing housings |
Vibration caused by self-damage | Misaligned bearings produce noise during rotation | Improper operation or incorrect assembly | Use correct assembly methods and assembly tools. Use induction heater with time control and temperature preset method |