Part of the ABC transporter complex FhuCDB involved in iron(3+)-hydroxamate import. Responsible for the translocation of the substrate across the membrane (By similarity). Involved in ferrioxamine-mediated iron(III) utilization (PubMed:10103258). The complex is composed of two ATP-binding proteins (FhuC), two transmembrane proteins (FhuB) and a solute-binding protein (FhuD). Belongs to the binding-protein-dependent transport system permease family. FecCD subfamily.