ISO 5609-4:2012

Overview

ISO 5609-4:2012 defines tool holders for internal turning with cylindrical shank - Style L. It specifies the geometric characteristics, designation and basic requirements for reduced-shank internal turning tool holders with a cutting-edge angle κ = 95°. These holders are intended for use with indexable inserts (hardmetal, ceramic or other cutting materials) clamped for internal turning operations.

Key topics and technical requirements

• Scope and style: Style L - reduced shank, cutting edge angle 95°, for internal turning.
• Dimensions and tables: Detailed dimensional data (diameters, lengths, minimum cutting-edge lengths, insert thickness s, and related symbols) are given in tables for rhombic (shape C) and hexagonal (shape W) inserts. Diameter sizes covered include typical ranges (e.g., d = 8 to 60 mm) and corresponding standard lengths.
• Designation: Standardized naming format referencing ISO 5609-4 plus supplementary symbols (mounting type, hand, insert shape and size) for unambiguous identification and ordering.
• Material: Acceptable materials include steel (≥1 000 N/mm² tensile strength), brazed hardmetal head, or heavy metal; manufacturer may choose material type.
• Design options: Holders may include or omit lubrication holes and antivibration devices; types of mounting and clamping follow the standard tables or may be agreed with the manufacturer.
• Corner radius and inserts: Guidance on corner radius r and which corner radii the tabulated f and l dimensions apply to; for non-standard radii follow ISO 5609-1 procedures.
• Extent of delivery and marking: Tool holders are delivered with clamping device but without inserts; marking should include the letter symbol and manufacturer name/trademark and ISO 5609-4 reference on packaging.

Applications and who uses it

• CNC and manual internal turning: Ensures compatibility between tool holders and indexable inserts for internal bore turning, grooving and profiling.
• Tool manufacturers and designers: Use the standard to design and specify Style L holders, determine dimensions and designation coding.
• Production engineers and machinists: Select properly sized holders and inserts to meet machining requirements and ensure interchangeability.
• Procurement and quality: Specify ISO-compliant holders for consistent sourcing and inspection.

Related standards

• ISO 5609-1:2012 - Designation, styles, dimensions and calculation for corrections (normative reference)
• ISO 5609 (Parts 2–6) - Other holder styles (F, K, U, Q)
• ISO 1832 - Indexable inserts designation
• ISO 13399 - Cutting tool data representation and exchange

Keywords: ISO 5609-4:2012, tool holders for internal turning, cylindrical shank, indexable inserts, Style L, cutting edge angle 95°, internal turning tool holders, insert thickness, corner radius.