Abstract: A helical vending module having dual diameter convolutions, and a vending machine equipped with a plurality of such modules. Preferably the vending machine comprises a generally cubical cabinet including a front service door equipped with a translucent panel facilitating visual exposure of the cabinet interior. Suitable conventional coin acceptor apparatus is provided to effectuate a vend when a particular product is selected by conventional control apparatus, and when a product is vended the selected module helice will rotate to effectuate a vend. The product will then drop downwardly into a customer accessible access zone. Each of the modules preferably comprises a rigid, generally planar frame which is adapted to be secured to an inclined supporting surface within the vending machine. The module frame support an outwardly projecting helical spindle coupled to an associated drive motor.