ISO 5609-1:2012

Overview - ISO 5609-1:2012 (Tool holders for internal turning)

ISO 5609-1:2012 defines the standardized code, styles, general dimensions and the method to calculate corrections for tool holders for internal turning with cylindrical shank designed for indexable inserts. Published in 2012, this part provides the designation system and dimensional rules used for boring bars (tool holders with cylindrical shank) intended for hardmetal, ceramic or other cutting-material inserts. It replaces earlier designations (ISO 5609:1998 and ISO 6261:2011) and is intended to be used together with ISO 5609‑2 through ISO 5609‑6.

Key topics and technical requirements

• Designation system: a 10-symbol code defining tool type, shank diameter, length, insert holding method, insert shape, tool style, normal clearance, hand (right/left), insert size and round‑shank flats.
  • Example format: S 25 S - P S K N R 12 - 41 (illustrative from the standard)
• Symbol tables and coding rules: standardized letters/numbers for shank diameters, lengths (A, B, C …), insert shapes (ISO 1832 correspondence), holding methods (top clamp, hole clamp, screw), and tool styles.
• Dimensions and tolerances: nominal shank diameter, profile, flat widths and key dimensions (d, f, l, a) and referenced general tolerances (e.g., ISO 2768 series where applicable).
• Identification of dimensions: rules for cutting-edge corner radii, master insert corner radii, and dimension annotation for manufacturing and inspection.
• Calculation for corrections: method to compute correction values (x, y) used to translate between tool geometry and effective cutting positions - enabling accurate programming and set‑up.
• Normative references and mappings: normative links to ISO 1832 (insert shapes), ISO 13399 (data exchange mapping), ISO 3002-1, ISO 2768, and others; annex shows relationship to ISO 13399 tool-data representations.

Practical applications and users

• Manufacturing engineers and tooling designers who specify and design boring bars and internal turning tool holders.
• CNC programmers and process planners who need standardized geometry and correction values for tool compensation and accurate internal turning operations.
• Quality and inspection teams verifying tool-holder dimensions and tolerances.
• Procurement and cataloging teams requiring consistent product identification, plus tool manufacturers adopting a common designation and interchangeability.
• CAM vendors and IT teams mapping tooling data to digital standards (ISO 13399).

Related standards

• ISO 5609 parts 2–6 (style-specific details)
• ISO 13399 (cutting tool data)
• ISO 1832 (indexable insert designations)
• ISO 3002-1, ISO 2768 (geometry and tolerances)

Keywords: ISO 5609-1, tool holders, internal turning, cylindrical shank, indexable inserts, designation, dimensions, boring bars, tool styles, correction values.