... couplingE.g.1HL6 flexible cover shaft coupling Main shaftY aperture of shaft,A key groove,d1=65mm,L1=142mmMinor shaftY aperture of ... shaft,A key groove,d2=65mm,L1=142mmE.g.2HL7 flexible cover shaft couplingMain shaftZ aperture of ... shaft,C key groove, d3=75mm,L1=107mmMinor shaftJ ...