Dodge Sleeve Coupling Flange, Finished Bore Flexible Type S, Series: D-Flex, 08 Coupling, 2-3/8 in Bore Dia, 3-1/4 in Hub Dia, 3/4 in Hub Length, 5/8 x 1/8 in Keyway, 4500 rpm Maximum, 2-3/32 in Length Through Bore, Cast Iron Rounded EPDM and neoprene element edges for full tooth engagement, even load distribution, reduced stress build up, and longer life. Outside diameter concentric to bore for ease in alignment. Interchangeable components makes installation quick and easy. No lubrication assures trouble-free operation