A cutting tool is rotatable about a central axis and has a front end in an axial direction along the central axis. The cutting tool includes a body, a blade, a first attachment screw, an adjustment piece, and a second attachment screw. The body has an outer peripheral surface. A pocket is formed in the outer peripheral surface at an end portion on the front end side. The blade is attached to the body by screwing the first attachment screw into the body in the pocket. The blade has a blade side surface facing inward in a radial direction that is orthogonal to the axial direction and that passes through the central axis. An inner wall surface of the pocket has a contact surface facing the blade side surface with a space being interposed between the blade side surface and the contact surface in the radial direction.

An example cartridge for a cutting tool system has a cartridge main body that has a cartridge main body first end, a cartridge main body second end, a first terminal wall, a second terminal wall, and an insert pocket. Each of the first terminal wall and the second terminal wall is disposed on the cartridge main body second end. The insert pocket extends from the cartridge main body second end toward the cartridge main body first end and has an axial pocket wall, a radial pocket wall, and an insert pocket floor. The axial pocket wall extends from the first terminal wall, toward the cartridge main body first end, and to the insert pocket floor. The radial pocket wall extends from the second terminal wall, toward the cartridge main body first end, and to the insert pocket floor.