A chain conveyor formed from a plurality of modules or links (1a, b, c) connected together by pins (2a, b) which are inserted through holes (4, 4A) present in said modules or links (1a, b, c) and are prevented from escaping by axially counteracting elements (5) mounted in seats (6) also present in said modules or links (1a, b, c), in which said axially counteracting elements (5) present a flexible tang (5c) which, when the axially counteracting element is mounted in the seat (6), intersects an end portion (4A) of the holes (4, 4A) through which the pin (2a, b, c) is inserted, to thus prevent said pin withdrawing from said holes (4, 4A), such withdrawal however being enabled by deflecting the flexible tang (5) (Figure 3).