6318 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 | |
| 6318 | 90 | 3.5433 | 190 | 7.4803 | 43 | 1.6929 |
| Deep Groove Ball Bearings No. | B | Load Rating(KN) | Steel Ball Parameter | |||
| Closed type | Dynamic | Static | No. | Size | ||
| mm | inch | Cr | Cor | mm | ||
| 6318 | 43 | 1.6929 | 143.00 | 107.00 | 8 | 32.000 |
| Deep Groove Ball Bearings No. | Max speed | Weight Kg | ||||
| Grease | Oil | |||||
| r/min | r/min | |||||
| 6318 | 3600 | 4200 | 4.900 | |||
Base oil of 6318 bearing
The mass fraction of base oil in grease accounts for 75~96%, and its performance mainly depends on the properties of the base oil. In particular, low-temperature fluidity and service life at high temperatures are closely related to the base oil. Generally, grease with a low viscosity base oil is suitable for low temperature and low load, and when the grease has a high viscosity base oil, it is suitable for high temperature and high load. There are two types of base oils used in grease: mineral oil and synthetic oil. The most commonly used synthetic base oils are: lipid oils, synthetic hydrocarbon oils, perfluoropolyethers, silicone oils and polyphenylene ethers, etc.
Thickener of 6318 bearing
Thickener generally accounts for 4 to 20% of the mass fraction of thickener. Its function is to suspend the base oil, reduce the fluidity of the base oil, and improve the adhesion between the oil and the friction surface. There are two types of thickeners: metallic soap base and non-metallic soap base. The critical operating temperature, mechanical stability, water resistance and other properties of grease are mainly determined by the thickener. For example, sodium soap base and water will react and form a latex, which cannot be used in bearings operating in high-temperature atmospheres.
Additive of 6318 bearing
The mass fraction of the base oil in the grease accounts for 0~5%. Additives are used to improve the performance and life of the grease. According to their functions, they can be divided into: tackifiers (strong adhesion), antioxidants, extreme pressure agents , corrosion inhibitors, etc.
Rotating torque, grease properties and filling quantities
The characteristics of the grease (viscosity, penetration, etc.) and the filling amount of the grease will affect the rotation torque of the bearing, which will further affect the rotation speed and cause temperature rise.
Generally speaking, as the filling amount of lubricant increases, the rotational torque increases, which will lead to temperature rise and speed fluctuation. For the same grease filling amount, the higher the viscosity, the greater the rotational torque.
Application of 6318 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 6318 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 6318 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.
The following table lists some of the problems that arise due to increased rotational torque.
The following table lists some of the problems that arise due to increased rotational torque of .
| Type | Describe | Reason | Targeted measures |
| Temperature rise | Bearing temperatures are getting higher and higher | The rotation of the bearing causes excessive agitation of the lubricant, resulting in a shearing effect, causing the temperature to rise. | Reduce the lubricant filling amount and change the lubrication groove type |
| Unable to meet speed requirements | Sometimes the motor cannot reach the design speed | Too much grease | Choose a soft lubricant |
| Excessive power consumption | Motor or engine uses more power than expected | Too much grease and high operating penetration lubricants can also cause this problem | Reduce the grease filling amount and change the grease type |
| Exceeds normal operating current | The operating current is too high when the motor is running | Grease filling amount Working penetration of soft agitation grease | Choose a soft-churn type of grease to reduce grease filling |
| Speed fluctuation | As the bearing rotates faster, speed fluctuations begin to occur. | Grease pours into the rotating raceway of rolling elements | Reduce the amount of grease to be filled, use grooved grease, and use grease with a higher softness. |
Note:Penetration is a measure of the tightness of a grease. The measuring device is a cone of a specific weight and shape. Penetration is the depth of penetration into the cone (unit is 1/10mm).
Type of 6318 bearing
| NLGL model | ASTM working penetration | Greases are distinguished by codes from different manufacturers. Code-named 250 and 300 calcium-based grease, fiber grease generally uses penetration (25C), most multi-purpose grease uses NLGL model, such as 0. 1, 2. |
| 0 | 355~385 | |
| 1 | 310~340 | |
| 2 | 265~295 | |
| 3 | 220~250 | |
| 4 | 175~205 | |
| 5 | 130~160 | |
| 6 | 85~115 |
