We report the hydriding characteristics of U(Fe1-xNix)AlHy, with x = 0.85. It is found that (i) U(Fe0.15Ni0.85)Al can be hydrided to a maximum of y≈2.4 and the hydride shows antiferromagnetic ordering with TN≈70 K, and (ii) new single phase orthorhombic hydrides can be stabilized for x≥0.85. From our hydriding and magnetic studies on all the compositions in this series of compounds, including our earlier work, it is found that irrespective of the magnetic state of the parent composition, the hydrides with y≥2 result in U-5f-electron localization and antiferromagnetic ordering. Structural and magnetic studies have also been carried out on the orthorhombic hydride phases and these are found not to order down to 2 K. © 2002 Elsevier Science B.V. All rights reserved.