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Solidifying and solid cryogens in steady shear are of fundamental importance to the fueling of fusion energy reactors. We present steady-state measurements of the dynamic shear stress, thermal conductivity, and heat transfer during flow of solid hydrogen, deuterium, and neon in a Couette-type viscometer cell. The measurements span a range of shear rates and temperatures from the onset of solidification to sub-cooled solid states. Normalization of the shear stress with parameters of the Lennard-Jones 6–12 potential indicates a favorable prediction of tritium properties using the quantum law of corresponding states.