In the context of increasing volumes of oil-and-gas production, quality and tightness assurance of oil-and-gas pipes has become a very urgent problem. The most common methods of pipe connecting are coupling and streamline joints with application of conic, trapezoidal and triangular threads, including buttress ones. The accuracy of thread profile production has a significant impact on interchangeability of items during assembly and their connection reliability, including tightness. In the process of production of items under consideration, various factors, such as technological heredity, rigidity of the processing equipment, its adjustment and installation and others, influence the thread production process. The given article introduces the results of carried-out studies on the impact of the duration of threaded machine operation and the lot of pipe blanks on the main parameters of the thread, such as thread tension by threaded gauge, thread length from the end without black crested threads, etc. The degree of each factor influencing the corresponding parameter was established on the basis of dispersion analysis.