Part of the ABC transporter complex FhuCDB involved in iron(3+)-hydroxamate import. Binds the iron(3+)-hydroxamate complex and transfers it to the membrane-bound permease. Required for the transport of all iron(3+)-hydroxamate siderophores such as ferrichrome, gallichrome, desferrioxamine, coprogen, aerobactin, shizokinen, rhodotorulic acid and the antibiotic albomycin. The complex is composed of two ATP-binding proteins (FhuC), two transmembrane proteins (FhuB) and a solute-binding protein (FhuD) (Probable). FhuD interacts with FhuB (PubMed:8522527, PubMed:9426146). Induced 1.3-fold by hydroxyurea. Exported by the Tat system. The position of the signal peptide cleavage has been experimentally proven. Can also be exported by the Sec system. Belongs to the bacterial solute-binding protein 8 family.