... coefficient 4.ISO9000:2001 5.OEM is ok 1.KOYO N 306Cylindrical roller bearings/koyo bearings/koyo roller bearingsN 2312N 304N ... bears radial load.Small friction coefficient, suitable for high speed.N and NU types can move axially.Inner or outer ring ... ,4.Types:Single row cylindrical roller bearing: N, NU, NJ, NF, NUP, NFP,NH(NJ+HJ)Double row cylindrical roller bearing: NN ...