An apparatus for hanging products, provided with a hanging string, on support rods, comprising: a supply line of the products, provided with first support means, able to support the products hung by the hanging strings, the first support means being conformed such as to maintain an eyelet of the hanging string open; a loading station of the products onto the support rods having constraint means (22, 23, 24) able to support a support rod (R') at a time in a fixed position; a transfer device, operating with a reciprocating motion, able to transfer the products, one at a time, from the supply line to the support rod (R') supported in the loading station, wherein the transfer device comprises: a sliding track which develops along a segment of a straight section, parallel to the support rod (R') supported in the loading station, a sole shuttle, able to transfer all the products one at a time, with an outward run in which it moves in a direction going from a proximal end (Ra) of the support rod (R') towards a distal end (Rb) up to a point where the product is released, and a return run in an opposite direction, in which the shuttle moves along the sliding track, in a direction going from the distal end (Rb) towards the proximal end (Ra), up to arrival in proximity of the supply line, the shuttle bearing a second support means conformed such as to supportingly receive the hanging string of a product and keep the eyelet of the string open such that the string can be inserted about the support rod (R'). a supply line of the products, provided with first support means, able to support the products hung by the hanging strings, the first support means being conformed such as to maintain an eyelet of the hanging string open; a loading station of the products onto the support rods having constraint means (22, 23, 24) able to support a support rod (R') at a time in a fixed position; a transfer device, operating with a reciprocating motion, able to transfer the products, one at a time, from the supply line to the support rod (R') supported in the loading station, wherein the transfer device comprises: a sliding track which develops along a segment of a straight section, parallel to the support rod (R') supported in the loading station, a sole shuttle, able to transfer all the products one at a time, with an outward run in which it moves in a direction going from a proximal end (Ra) of the support rod (R') towards a distal end (Rb) up to a point where the product is released, and a return run in an opposite direction, in which the shuttle moves along the sliding track, in a direction going from the distal end (Rb) towards the proximal end (Ra), up to arrival in proximity of the supply line, the shuttle bearing a second support means conformed such as to supportingly receive the hanging string of a product and keep the eyelet of the string open such that the string can be inserted about the support rod (R'). a sliding track which develops along a segment of a straight section, parallel to the support rod (R') supported in the loading station, a sole shuttle, able to transfer all the products one at a time, with an outward run in which it moves in a direction going from a proximal end (Ra) of the support rod (R') towards a distal end (Rb) up to a point where the product is released, and a return run in an opposite direction, in which the shuttle moves along the sliding track, in a direction going from the distal end (Rb) towards the proximal end (Ra), up to arrival in proximity of the supply line, the shuttle bearing a second support means conformed such as to supportingly receive the hanging string of a product and keep the eyelet of the string open such that the string can be inserted about the support rod (R').