Both good tensile properties and good resistance to thermal shrinkage are prerequisites for tire cord applications. For these purposes, poly(ethylene-2,6-naphthalene dicarboxylate) (PEN) filaments were prepared by multistep zone annealing (MSZA) spinning with a specially devised system. The melting temperature of the PEN filaments so obtained was slightly increased with an increasing total draw ratio. All the filaments exhibited a sharp melting peak around 270 degreesC, but glass-transition behavior was barely visible via differential scanning calorimetry. Rheovibron experiments showed a relaxation in the vicinity of 175 degreesC. Increasing the draw ratio above 4 did not increase the birefringence value much, but it did lead to increases in the tensile proper-ties. The PEN filaments consisted exclusively of a-form crystals. The PEN filaments showed excellent resistance to thermal shrinkage, which was less than 1% even with heating to 140 degreesC. In the MSZA spinning process, increasing the degree of hot drawing proved more effective than increasing the degree of cold drawing for obtaining PEN filaments with better dimensional stability at elevated temperatures.