Insert and body

An insert for a cutting process, the insert being constrained with a pair of side wall surfaces of a fitting recess formed in a body of an indexable tool, and being assembled with the body by fastening with a fastening member, comprising:

• a constraining part fitted with the fitting recess;
• a through hole piercing through the constraining part, through which the fastening member is inserted;
• and
• a blade projecting from the constraining part in a direction perpendicular to a central axis of the through hole, wherein:
• the blade includes a cutting edge for the cutting process, the cutting edge forming a part of an edge apart from the central axis;
• an outer surface of the constraining part around the central axis includes a pair of first constraining surfaces abuttable on the pair of side wall surfaces, and a pair of second constraining surfaces having an angle formed between the second constraining surfaces is the same as an angle formed between the pair of first constraining surfaces in a section of the constraining part perpendicular to the central axis;
• a shortest distance from the central axis to the pair of first constraining surfaces is set to be the same as a shortest distance from the central axis to the pair of second constraining surfaces in the section of the constraining part perpendicular to the central axis;
• and
• a position of the cutting edge in a state where the pair of first constraining surfaces abuts on the pair of side wall surfaces becomes non-parallel to a position of the cutting edge in a state where the pair of second constraining surfaces abuts on the pair of side wall surfaces.