An automatic cable tie apparatus tightens and fastens a cable tie around a bundle of cables. A motor imparts rotational movement to a shaft separately in a first direction and a second direction. The first and second directions are one of a clockwise and counter-clockwise direction. A cable tie delivery mechanism is operably joined to the motor such that the cable tie delivery mechanism transfers a cable tie to a cable tie load starting position as the shaft rotates in the first direction. A transporter is also operably joined to the motor such that the transporter transfers the cable tie from the cable tie load starting position to a cable tie tensioning position as the shaft rotates in the second direction.