... a cone spacer.Double-Row Tapered Roller Bearings (TDO Double-Row Tapered Roller Bearings (TDO Type)This type of bearing ... research, development, manufacture and sales of precision bearings, special bearings, high-frequency electric spindles for machine tool, ... National Accreditation Laboratory for BearingState Key Laboratory for Bearings of Earth Pressure Balance ShieldState Quality Supervision ...