MSA series linear guide adopts 4 rows of circular contact type and 45° antenna steel ball row design, providing the same load rating capacity in radial, inverse radial and transverse directions. It can be used in various installation modes of X, Y, Z and other axes, and can be evenly preloaded to enhance the rigidity of the four force directions under the condition of maintaining low friction resistance. Especially suitable for high precision and high load mode.