Agricultural machinery and equipment are characterized by relatively dirtyoperation environment，high requirements for waterproof and dust-proof performance of bearing products，and they canadapt to extreme conditions(such as outdoor conditions with large temperature difference or serious muddy water and dust) .Most of the sealing forms of agricultural bearings are double or three lip seals，which can effectively isolate water and dust.

According to the installation method，the inner ring is round，square or hex a gonal，and the outer ring is cylindricalor spherical.