  Binary uranium hydrides, UHx (x = 1, 2, 3, 5, 6, 7, 8), with different
crystal symmetries are potentially interesting compounds for high-Tc
superconductivity and as hydrogen storage systems. In this work we have
explored the structural, elastic, mechanical, bonding, and thermophysical
properties of these systems under uniform pressure via density functional
theory based computations. Most of the results disclosed in this work are
novel. From the calculations of the cohesive energy and enthalpy of formation,
we have found that the titled compounds are chemically stable. The computed
elastic constants at different pressures ensure elastic stability. All the
binary hydrides are mechanically anisotropic. Pressure induced brittle-ductile
transition takes place under high pressure. The compounds are machinable with
the cubic {\alpha}-UH3-Pm-3n showing very high value of the machinability
index. All the compounds are fairly hard with cubic UH8 showing superhard
character. The Debye temperatures and acoustic velocities of these compounds
are high; the highest value is found for the cubic UH8. The melting
temperature, Gr\"uneisen parameter, minimal phonon thermal conductivity, and
the thermal expansion coefficient of these compounds have also been studied at
different pressures. All these parameters show excellent correspondence with
the estimated Debye temperature, elastic parameters and bonding
characteristics.
