The study is aimed at assessing the effect of the structure of the nitrided layer on the adhesive bond strength of the coating TiAlN with a high- peed steel base. The method of ion nitriding in a gas plasma of a two-stage vacuum arc discharge allows you to control the structure of the layer by changing the nitrogen content in a gas mixture with argon. Studies have shown that the structure of the nitrided layer significantly affects the adhesive bond strength of the coating. It has been experimentally established that the nitrided layer formed in a gas medium with a low nitrogen content provides increased adhesive bond strength and improved cutting properties of the tool.