Top hammer rock-drilling tool has external cylindrical guide surface formed between male thread and waist, and co-operates with internal guide surface between female thread and free end of coupling sleeve

摘要

A cylindrical guide surface (31) between male thread (5) and waist (32) co-operates with an internal guide surface between female thread and free end of a coupling sleeve. The waist is formed axially inside the male thread of the drill rod consisting of martensitic stainless steel. Independent claims are also included for the following: (1) a drill rod; (2) and a coupling sleeve for top hammer rock-drilling tool.