Bearing segment (21) which is provided with at least two flights (23a, 23b) which have in section a shape such that when the bearing segment (21) is attached to a right and a left extruder screw, the flights (23a, 23b) of one bearing segment (21) with the worm threads (23a, 23b) of the other bearing segment (21) fully engage, wherein the worm threads (23a, 23b) are arranged in the rotational direction with a uniform offset of their respective phase, each helical thread ( 23a, 23b) has a flank extending in the axial direction of the bearing segment (21) and over the entire length of the flight (23a, 23b), the length of each flight (23a, 23b) in the axial direction of the bearing element (21) is set to at least 0.2 times a rotational outer diameter (D) of the bearing segment (21), characterized in that the worm threads (23a, 23b) are set such that a distance between front end (27a, 27b) of the flights (23a, 23b) and a rotational axis of the bearing segment (21) toward the front side of the rotational direction of the bearing segment (21) is gradually reduced.
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