This part of ISO 5609 specifies the code for the designation, styles, general dimensions and calculation for corrections for tool holders for internal turning with cylindrical shank. It is intended to be used in conjunction with, and is completed by, ISO 5609-2, ISO 5609-3, ISO 5609-4, ISO 5609-5 and ISO 5609-6. These tool holders are primarily intended for indexable inserts made of hardmetal, ceramic or other cutting materials to be mounted by clamping and to be used for internal turning operations.This part of ISO 5609 also incorporates the contents of ISO 6261:201112)) [designation for tool holders with cylindrical shank (boring bars) for indexable inserts].