1. An indexable double-sided negative cutting insert (14) having an axis (A) of indexing around which the plate is indexed, comprising: two opposing end surfaces (36), each of which comprises at least one first functional surface (50), a peripheral surface (38) extending between the end faces (36) and comprising at least one convex protrusion (54), and at least two second functional surface (56), each of which extends at least between the adjacent facer wail surface (36) and at least one projection (54), the median plane (P), located midway between the end surfaces (36) and extending through the peripheral surface (38); and at least two opposing side cutting edges (46), each of which is formed at the junction between the peripheral surface (38) and each of the opposite end surfaces (36); prichempo least one protrusion (54) comprises two lateral bearing surfaces (60) which converge outwards towards the median plane (P); a top view of each end surface (36) a projection (54) extends outwardly from the cutting insert (14); ive each cross section perpendicular sredneyploskosti (P) and passing through the two opposing side cutting edges (46) and through at least one protrusion (54), no portion of the peripheral surface (38) is located inside an imaginary line (L1), connecting opposing side cutting edges (46) .2. The cutting insert (14) according to Claim. 1, wherein the peripheral surface (38) comprises a plurality of peripheral side sections (52) .3. The cutting insert (14) according to claim. 2, in which all the peripheral side sections (52) are identichnymi.4. cutting Place
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