3984/3920 KOYO Tapered Roller Bearing 66.675x112.712x30.162mm This is the most basic and most widely used type of tapered roller bearing. It consists of two main separable parts: the cone (inner ring) assembly and the cup (outer ring). It is typically mounted in opposing pairs on a shaft. KOYO offers the most extensive line of tapered roller bearings in the world. Tapered roller bearings consist of four interdependent components: the cone (inner ring), the cup (outer ring), the tapered rollers (rolling elements) and the cage (roller retainer). Tapered roller bearings are uniquely designed to manage both thrust and radial loads between a rotating and non-rotating member. The steeper the cup angle, the greater the ability of the bearing to handle thrust loads. Industries: Aerospace, agriculture, automotive, heavy truck, cement, aggregate, coal, oil and gas, construction, gear drives, machine tools, mining, paper, metals, rail and wind. Benefits: Enhanced performance in demanding applications. Dimensions: Inside diameter d: 66.675mm - 2.6250 inch Outside diameter D: 112.712mm - 4.4375 inch Width T: 30.162mm - 1.1875 inch Cone width B: 25.400mm - 1.0000 inch Cup width C: 19.050mm - 0.7500 inch MADE IN JAPAN Package Include : ONE BEARING 3984 + ONE RACE 3920 KOYO