Cutting tool and replaceable cutting head having spiral driven surfaces therefor

A replaceable cutting head (22), for rotary cutting operations, having a head longitudinal axis (A) around which the replaceable cutting head (22) rotates in a direction of rotation (R), the head longitudinal axis (A) extending in a forward (DF) to rearward direction (DR), comprising:

• a forward portion forming a cutting portion (26) and a rearward portion forming a mounting portion (28);
• the cutting portion (26) comprising:
• a plurality of cutting members (30) extending radially with respect to the head longitudinal axis (A);
• and
• the mounting portion (28) comprising a male coupling member (40) protruding rearwardly from a base surface (42), the base surface (42) extending transversely with respect to the head longitudinal axis (A), and defining a boundary between the cutting portion (26) and the mounting portion (28), the male coupling member (40) comprising:
• three circumferentially spaced apart head fixation members (44), each head fixation member (44) comprising a head peripheral surface (46) diverging rearwardly with respect to the head longitudinal axis (A), wherein:
• in each cross section of the male coupling member (40) taken in a plane through the head peripheral surface (46) and perpendicular to the head longitudinal axis (A), a first end point (PE1) on any head peripheral surface (46) is closer to the head longitudinal axis (A) than a second end point (PE2) on the same head peripheral surface (46), the second end point (PE2) being circumferentially disposed further in the direction of rotation (R) relative to the first end point (PE1).