One-dimensional Nylon6 nanofibers were fabricated through the electrospinning process. The effect of the applied electric field and voltage-distance combinations on the diameter and size distribution of the fibers was examined systematically by analyzing scanning electron microscopy (SEM) images. The results indicated that maintaining the electric field at 1 kV/cm with the voltage-distance combination of 15 kV-15 cm among all other combinations would result in the optimum average diameter as well as a narrow size distribution of the fibers. SCANNING 35: 183-188, 2013. (c) 2012 Wiley Periodicals, Inc.