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First, how to select a grease?
Lubrication on the work and life of NSK bearings have a very important impact, here to brief you choose general principles of grease. Greases consist of base oils, thickeners and additives made of different types and different brands of the same type grease performance varies widely, allowing rotation limit of different, when you choose it is important to note. Performance base oils are the main decisions of the grease, generally applies to low temperature base oils of low viscosity, high speed, high viscosity suitable for high temperature, high-load. Bearing lubrication performance thickening agent, thickening agent: hydrolytic resistance decided to grease resistance to water. In principle, the different brand of lubricating greases cannot be mixed, and, even if it is the same thickener of grease, also due to additive different bad impact on each other.
Second, the bearing must be cleaned before install does?
Bearing surfaces coated with rust preventive oil, you must carefully clean with clean gasoline or kerosene, and then coated with clean high quality or high speed and high temperature lubricant can be installed using. Cleanliness on life and the effects of vibration and noise of rolling bearings are very large. But we want to remind you is: sealed bearings do not cleanse refueling.
Three, how to install and remove?
NSK bearing for installation do not directly hammer face and non-bearing surface, pressure should be block, sleeve or other installation tools (Tools) bearing uniform force, not by rolling power installation. If the surface coated with lubricants, will make the installation more smooth. If combined with large interference, bearing in mineral oil should be heated to 80~90℃ as soon as possible after installation, strictly control the oil temperature not exceeding 100 ° c, to prevent the effect of tempering hardness reducing the impact and size of recovery. When difficulties are encountered in demolition, we recommend that you use the removal tool to pull to the inner ring at the same time careful perfuse hot oil, heat makes rolling bearing inner ring expansion, making it more prone to shedding.
IV, on the surface and the installation site requirements?
Yes. If NSK bearing scrap iron, burrs, the entry of foreign matter such as dust, will make the bearing in operation when the noise and vibration, or even damage the raceways and rolling elements. So, before you install the bearing, you must ensure that the installation surface and environment clean.
When five, lubricated bearings, grease, the more the better?
Lubrication of NSK bearings, grease, the more the better, this is a common misconception. Bearings and bearing Interior too much fat will cause excessive mixing of oils, resulting in extremely high temperatures. Filling quantity of lubricant of rolling bearing 1/2~1/3 suitable to fill the bearing internal space, high speed should be reduced to one-third.
Six, bearing radial clearance smaller please?
Not all work requires a minimum clearance of NSK bearings, condition, you must select proper clearance. GB 4604-93, rolling bearing radial clearance is divided into five groups-2 group 0, group 3, group 4, group 5, group, clearance value in turn from small to large, 0 group where as the standard clearance. Basic radial tour gap group applies Yu General of running conditions, and General temperature and the common of had Ying tie; in high temperature, and high-speed, and low noise, and low friction, special conditions Xia work of rolling bearing is should be selection large of radial tour gap; on precision spindle, and machine spindle with bearing, should be selection smaller of radial tour gap; for roll child bearing can maintained small of work tour gap. In addition, it doesn't matter for isolation bearing clearances; and, finally, bearing capacity of work clearance, to original clearance smaller than before the installation, because the load bearing to withstand a certain rotation, NSK bearings also to cope with and the elastic deformation of the load.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| RLM1412 NSK | 14 | 22 | 12 |
| RLM121920-1 NSK | 12 | 19 | 20 |