A mower with a cutter bar including an elongated hollow casing, at least one bearing block mounted at the level of an orifice of the upper wall of the casing, at least one disk integral with a support shaft mounted in the bearing block, at least one cutter fixed with the ability to rotate freely on the disk, wherein each bearing block is made integral with the casing by at least one fastener assembly composed of at least two fastening elements assembled mutually by screwing. The mower wherein, for each fastener assembly, at least part of the zone or zones of engagement of the respectively female-threaded and male-threaded parts of the fastening elements is situated between the respective mutually opposite bracing surfaces of the fastening elements. Thus the fastening elements are less protruding and their connection zones are not subjected to the aggressions of the outside environment.
