The magnetic anisotropy and magnetostriction of UFe 1 0 Si 2 were studied on aligned polycrystals. At 4.2 K the magnetic anisotropy is described by K 1 = 3.0 MJ m - 3 and K 2 = -0.9 MJ m - 3 . The magnetostriction constants obtained from the magnetostriction and thermal expansion measurements are λ 1 α , 0 = 2.14 10 - 3 , λ 2 α , 0 = 6.07 10 - 3 , λ 1 α , 2 = -0.4 10 - 4 , λ 2 α , 2 = 0.9 10 - 4 and λ γ , 2 = 1.8 10 - 4 .