| 摘要 |
<p num="1">In a cutting tool having an indexable cutting insert (20) with four cutting portions (26a, 26b, 26c, 26d), the cutting insert is securable within a holder portion in four index positions by means of a fastener. The cutting insert has two opposing end surfaces (22) with a peripheral side surface (24) and a central axis (c) extending therebetween, the peripheral side surface having exactly four abutment zones (28a, 28b, 28c, 28d). The insert holder (42) has a holder portion (46) and a body portion (48), the holder portion having a sidewall surface with a first, second and third reaction zone. The cutting insert is divided into four imaginary quadrants about its central axis and the four abutment zones are located entirely in two of the four imaginary quadrants, and for each index position, three of the four abutment zones are in clamping contact with the three reaction zones.
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