The using life load carrying capacity and shock resistant ability of sealed four-row tapered roller bearings used in mill rolls are very long and high. According to different working condition and environment LYC designed various sealing equipments to protect bearings from hazardous substances which make the using life of the bearings obviously longer than those open bearings without seals. LYC has the proprietary intellectual property rights of sealed four-row tapered roller bearings used in mill rolls.