This paper presents an experimental investigation into the thermal behavior of Self-Propelled Rotary Tool (SPRT) in turning difficult-to-cut material AISI 4140 hardened steel under dry condition. The experimental results were used to explain the influence of tilting angles of SPRT on thermal behavior of cutting tool. When changing the tilting angle from 25○ to 35○ the results show a significant difference in thermal behavior of the cutting tool such as tool temperature was reduced by 5.49 % as a result of spinning action. Further increases of tilting angle increases contact length and spinning speed, and thus reduced the effective cooling time per one revolution for non-contact/contact portion of the cutting tool. Finally, a comparison was made between SPRT and fixed tool (FT), which revealed that the use of SPRT is preferable to reduce the temperature in the cutting zone.