Disc Harrow Bearing Square Bore DS208TT12One New Aftermarket Replacement Square Bore Disc Harrow Bearing DS208TT12 W208PPB12 This heavy duty 1 1 8" square bore disc harrow bearing is a direct aftermarket replacement for disc harrow gang assemblies used on a wide range of agricultural tillage equipment. The bearing features triple lip seals on both sides to protect against dirt, moisture, and corrosive field environments, and comes pre lubricated with high temperature grease for long service