The basic Grid-Lign coupling consists of two steel shaft hubs, a high strength spring steel tapered grid element, two seals and a cover assembly. Misalignment and end float are accommodated by the sliding action of the grid in the lubricated hub grooves. Dodge Grid Coupling Hub, Type T10/T20, 1060T Coupling, 1-5/8 in Bore Dia, 3 in Hub Dia, 3/8 x 3/16 in Keyway, 3600 rpm Maximum, 2-1/2 in Length Through Bore, Steel