Replaceable cutting head having threaded mounting portion with two spaced apart conical abutment surfaces provided with the same cone angle, tool holder and rotary cutting tool

A tool holder (24), having a holder longitudinal axis (C) extending in the forward (DF) to rearward direction (DR), comprising a female coupling member (68) extending rearwardly from a forwardly facing holder forward surface (70), the holder forward surface (70) extending transversely with respect to the holder longitudinal axis (C), the female coupling member (68) comprising:

• inwardly facing forward and rearward supporting portions (80, 82) and an internal thread (72) located therebetween wherein;
• the forward supporting portion (80) comprises a forward holder abutment surface (84) that tapers inwardly in a rearward direction (DR) defining a forward holder cone angle (γ);
• the rearward supporting portion (82) comprises a rearward holder abutment surface (88) that that tapers inwardly in a rearward direction (DR) defining a rearward holder cone angle (δ);
• the forward and rearward holder abutment surfaces (54, 56) are formed by turning operations with a turning tool without reconfiguring said turning tool, thereby resulting in the forward and rearward holder cone angles (γ, δ) being within ±0.5° of each other.

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), wherein;
• the mounting portion (28) comprises a male coupling member (38) protruding rearwardly from a rearwardly facing head base surface (40), the head base surface (40) 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 (38) comprising:
• outwardly facing forward and rearward bearing portions (50, 52) and an external thread (42) located therebetween wherein;
• the forward bearing portion (50) comprises a conically shaped forward head abutment surface (54) that tapers inwardly in a rearward direction (DR) defining a forward head cone angle (α);
• the rearward bearing portion (52) comprises a conically shaped rearward head abutment surface (56) that tapers inwardly in a rearward direction (DR) defining a rearward head cone angle (β);
• the forward and rearward head cone angles (α, β) have the same value;
• and
• the external thread (42) is a straight, non-tapered thread.