A modular conveyor belt adapted to be driven by at least one gear wheel, wherein said conveyor belt is adapted to move in a conveying direction, said belt comprising a plurality of successive, mutually hinged modules (1, 1,...1), each module comprising in turn: a) an intermediate section extending along an axis transverse to said conveying direction, having a top surface for supporting objects to be conveyed, a front side, a rear side, a first lateral side and a second lateral side; b) a first plurality of hinge rings (31a, 31); b1) extending from said front side along said conveying direction; b2) having a pair of lateral walls (311,312) which define the transverse dimension thereof; b3) having holes (4a, 4) aligned along a single axis parallel to said transverse axis for receiving a first connecting pin; c) a second plurality of hinge rings c1) extending from said rear side along said conveying direction; c2) having a pair of lateral walls (321, 322) which define the transverse dimension thereof; c3) having holes extending along a single axis parallel to said transverse axis for receiving a second connecting pin; d) said first and second hinge rings (31 a, 31, 32) having mating profiles, such that the first hinge ring (31a, 31) of said module may be in intermeshing relationship with the second hinge rings of a similar adjacent module, and that the second hinge rings of said module may be in intermeshing relationship with the first hinge rings (31a, 31) of a second similar adjacent module; e) the hole of at least one lateral hinge ring (31 a) of at least one of said two pluralities of hinge rings (31 a, 31, 32) has a hole with an inner portion having an enlarged cross section defining a seat; said connecting pin has an end comprising a head with an enlarged cross section for snap-fit insertion of said head into said seat of said lateral hinge ring (31 a); said snap-fit insertion of said head being obtained by a linear movement of said pin; characterized in that said head of the pin is a sphere or a spherical cap whose maximum transverse dimension is greater than the transverse dimension of the rest of the pin and wherein said seat has a shape that mates the shape of said head so that said pin is locked in a safe but reversible manner. a) an intermediate section extending along an axis transverse to said conveying direction, having a top surface for supporting objects to be conveyed, a front side, a rear side, a first lateral side and a second lateral side; b) a first plurality of hinge rings (31a, 31); b1) extending from said front side along said conveying direction; b2) having a pair of lateral walls (311,312) which define the transverse dimension thereof; b3) having holes (4a, 4) aligned along a single axis parallel to said transverse axis for receiving a first connecting pin; b1) extending from said front side along said conveying direction; b2) having a pair of lateral walls (311,312) which define the transverse dimension thereof; b3) having holes (4a, 4) aligned along a single axis parallel to said transverse axis for receiving a first connecting pin; c) a second plurality of hinge rings c1) extending from said rear side along said conveying direction; c2) having a pair of lateral walls (321, 322) which define the transverse dimension thereof; c3) having holes extending along a single axis parallel to said transverse axis for receiving a second connecting pin; c1) extending from said rear side along said conveying direction; c2) having a pair of lateral walls (321, 322) which define the transverse dimension thereof; c3) having holes extending along a single axis parallel to said transverse axis for receiving a second connecting pin; d) said first and second hinge rings (31 a, 31, 32) having mating profiles, such that the first hinge ring (31a, 31) of said module may be in intermeshing relationship with the second hinge rings of a similar adjacent module, and that the second hinge rings of said module may be in intermeshing relationship with the first hinge rings (31a, 31) of a second similar adjacent module; e) the hole of at least one lateral hinge ring (31 a) of at least one of said two pluralities of hinge rings (31 a, 31, 32) has a hole with an inner portion having an enlarged cross section defining a seat; said connecting pin has an end comprising a head with an enlarged cross section for snap-fit insertion of said head into said seat of said lateral hinge ring (31 a); said snap-fit insertion of said head being obtained by a linear movement of said pin;