Abstract: A linear motion module comprises a linear rail, a sliding block and balls. The sliding block is slidingly disposed on the linear rail and comprises a sliding block body, circulation elements and end caps. The inside of the sliding block body is configured with inner circulation grooves, the inner circulation groove and the rail groove constitute an inner circulation passage, and each of two sides of the sliding block body is configured with at least a circulation channel that corresponds to the inner circulation passage and penetrates through the sliding block body. Each of the circulation elements includes at least a circulation tube, and the opposite two circulation tubes are connected to each other to constitute an outer circulation passage. Each of the end caps is configured with at least two circulation guiding grooves, and the circulation guiding groove is connected to the inner and outer circulation passages.

Abstract: A ball screw includes a screw, a nut and a plurality of balls. The nut is slidingly disposed on the screw and includes a nut body and at least one end assembly. The end assembly includes an end circulation member, a dust-proof member and a fastening member. The fastening member and the end circulation member are disposed on the opposite sides of the dust-proof member. One side of the fastening member includes a plurality of projections, and the other side of the fastening member includes a plurality of indentations corresponding to the projections.