Cutting insert and a tool for chip removing machining, as well as an attachment for such tools

A tool for chip removing machining, comprising:

• a basic body having an insert seat and a replaceable cutting insert, which is mounted in the insert seat by means of a tightening element, the cutting insert and the insert seat including co-operating connecting surfaces, each one of which has male- and/or female-like engagement means having the purpose of rigidly securing the cutting insert in a mounted state, each of the engagement means comprises a pair of flanks, which extend parallel and are inclined at an angle to each other while giving the engagement means a v-shaped cross section, said flanks contacting a corresponding pair of flanks of a mating engagement means in a connecting surface of the basic body so as to secure the cutting insert in a mounted state but not at an intermediate surface spacing the flanks apart, and the tightening element directly or indirectly defining a geometrically predetermined reference locus in which a tightening force requisite for the clamping of the cutting insert is applied to the cutting insert, wherein simultaneously active engagement means in the individual connecting surface, consisting of:
• a first generally elongate engagement means, which is located between a front end of the connecting surface and said reference locus, and a second, likewise generally elongate engagement means, which is oriented at an angle to a length extension of the first engagement means, and located at a greater distance from said front end than the reference locus.