Drill bit for percussive rock drilling

摘要

The invention relates to a drill bit (20) for percussive rock drilling, which comprises: - a drill head (21); - a skirt (24), which has a first end and an opposite second end, the skirt being connected to the drill head at said first end; - a recess (25) extending axially through the skirt from the second end of the skirt towards the first end thereof, the recess being provided with an internal, cylindrical female thread (26); and - an impact surface (27) at the bottom of the recess. Every cross-section of the recess (25) between the impact surface and the part of the recess where the female thread has its full thread profile has a cross-sectional area which is smaller than the cross- sectional area of a cross-section of the recess at the part of the recess where the female thread has its full thread profile.