The invention relates to a segment for drum refiners provided with comminuting, in particular grinding surfaces with a projection of hammerhead-shaped cross section for anchoring on the rotor or rotor drum shell. The invention is characterized mainly in that the segment (2') of T-shaped cross section consists of a slim stem (2'') and a slim flange (2''') and that the transition surfaces from stem to hammerhead (12) viewed in cross section form an angle ( beta ) of between 15 and 75 degrees, preferably of about 55 degrees, open towards the hammerhead and conveniently equal on both sides with the axis of symmetry (8) of the hammerhead of symmetrical cross section. The ratio of the stem thickness (D) to the segment height (H) conveniently amounts to between 1:5 and 1:9, preferably about 1:7, and the flange thickness (FD) on the stem is about equal to the thickness of the stem. The transistions between flange and stem and between stem and hammerhead conveniently extend along comparatively large radii of curvature (R), for instance along a radius (R) which is equal to one half the time to one time the least thickness (S) of the flange.
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