Contact seals are used on both sides of NNF bearings

Both sides of NNF bearings use contact seals. The bearing is filled with lubricating grease, which has a working temperature of 50 ° C to+110 ° C, but due to the limitations of the sealing material, the working temperature of the bearing is limited to -40 ° C to+80 ° C Celsius. In better conditions, NF bearings with seals do not require maintenance and can be exposed to water vapor or polluted environments for a long time. During medium to high speed operation, the bearing can supplement the lubricating oil groove and lubricating oil hole on the outer ring.

The key to SKF proxy bearing tolerance level is to determine the rotational accuracy from the shaft to the support point. Level 0: Generally used for bearing systems with a rotational accuracy of over 10 microns, and is widely used. For example, the speed control mechanism of ordinary CNC lathes, cutting mechanisms, speed control mechanisms of automobiles, speed control mechanisms of large tractors, rotating mechanisms of motors, centrifugal pumps, agricultural machinery, and other ordinary chemical machinery

Level 6 and Level 5: In precision bearing systems with a rotational accuracy of 5-10 micrometers or higher speeds, such as commonly used bearings in CNC lathes (with a front support point of level 5 and a rear support point of level 6), finer equipment, instrument panels and their gauges, instrument panels, and precision rotating mechanisms. Level 4 and Level 2: In super instruments such as precision coordinate milling machines and precision grinding machines, the transmission gear system software,

Instruments, dashboards, high-speed cameras, etc. have a rotation accuracy of no more than 5 micrometers and a relatively high rotational speed. The old code for precision grade before Chinese bearings. The standards formulated internationally are generally consistent with ISO standards, and some are relatively strict. Accuracy is divided into specification accuracy and rotation accuracy. Divided into 0 degrees, 6X degrees, 6 degrees, 5 degrees, 4 degrees, and 2 degrees.