A robot 1 having a first assembly 4, 5 and a second assembly 3, 6, wherein a bearing arrangement 24, 25, 52, 53, by which the second assembly 3, 6 can be moved relative to the first assembly 4,5 is provided in the first assembly 4,5. The bearing arrangement 24, 25, 52, 53 comprises a first fastening element 26, 27, 54, 55, and the second assembly 3, 6 comprises a second fastening element 30, 31, 60, 61, wherein the first fastening element 26, 27, 54, 55 and the second fastening element 30, 31, 60, 61 are connected to one another, and wherein the first fastening element 26, 27, 54, 55 and the second fastening element 30, 31, 60, 61 are designed to be complementary, at least in sections. A method for mounting two assemblies 2, 3, 4, 5, 6, in particular two robotic arms, of a robot is also disclosed.