... Outer Diameter 30mm, Length 42mm, bore 6.35-10mm 30*42--6.35-10mm Oldham Coupling, Outer Diameter 30mm, Length 42mm, bore ... polyurethane 4 pieces. * M: The hole dia. Of the encoder end. N: The hole dia. Of the user end. * D and ... of coupling.30mm (special please indicate)M: The hole dia. of the encoder end.Φ4,Φ5,Φ6,Φ8,Φ10,Φ12 ... ,Φ15mmN: the hole dia.of the user end.Φ4,Φ5,Φ6,Φ6.35,Φ7 ...