Dithiane is an ultra-short single-molecule insulator which has been confirmed in a recent experimental study [B. Zhang, M. H. Garner, L. Li, L. M. Campos, G. C. Solomon and L. Venkataraman, Chem. Sci., 2021, 12, 10299-10305]. In this work, we investigate the spin-dependent transport properties of dithiane sandwiched between conventional ferromagnetic electrodes using nonequilibrium Green's functions in combination with density functional theory. Here we explore the spin-transport properties of dithiane connected to two different ferromagnetic electrodes, namely, Ni and Co electrodes. An obviou...