| 摘要 |
In a first aspect, the invention relates to a rock-drilling tool that comprises a drill rod (1) having a male thread (5) as well as a coupling sleeve having a female thread for the co-operation with the male thread of the drill rod. The male thread (5) of the drill rod may consist of a martensitic stainless steel. Axially inside the male thread (5), a waist (32) is formed in which the drill rod (1) has the smallest diameter thereof. Furthermore, an external, cylindrical guide surface (31) is positioned between the male thread (5) and the waist (32) and has the purpose of co-operating with an internal guide surface positioned between the female thread and a free end of the coupling sleeve. Furthermore, the invention relates to a drill rod as such as well as a coupling sleeve as such.
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