ISO 504:1975

Overview

ISO 504:1975 establishes internationally recognized guidelines for the designation and marking of turning tools with carbide tips. Developed by the International Organization for Standardization (ISO), this standard provides a consistent approach for identifying carbide-tipped turning tools, specifically those in the metric series covered by ISO 243 and ISO 514. The main intent is to facilitate clear communication, quality control, and interoperability in machining processes involving external and internal turning tools.

The standard is essential for manufacturers, suppliers, and users of carbide-tipped turning tools, ensuring standardized labeling that reflects key characteristics such as tool type, direction, shank dimensions, and carbide grade application.

Key Topics

• Designation System:

  • The standard specifies the sequence of elements in the tool designation, including:
    • The mark “ISO” followed by the tool type number (from ISO 243 or ISO 514),
    • The direction symbol (“R” for right-hand tools, “L” for left-hand tools),
    • The dimensional symbol for the shank measured in millimeters (e.g., 2525 for a square shank 25mm x 25mm),
    • The carbide grade group symbol (based on ISO 513, which categorizes carbide applications).

• Marking Requirements:

  • The markings are to be applied to specific areas of the tool shank to ensure visibility and uniformity:
    • The colour for the main group of chip removal is applied on the back part or entire shank.
    • The group of application symbol is inscribed on the left-hand lateral face and the rear face of the shank.
    • Optionally, the tool type number can be marked adjacent to the group of application symbol for easier identification.

• Examples of Designation:
  An abridged international designation reads as:
  Tool: [ISO 6](/search?q=ISO%206) R 2525 - P20
  which indicates:

  • ISO tool type 6 (right-hand),
  • Square shank 25 mm x 25 mm,
  • Carbide tip from group P20 (high-performance grade for machining).

Applications

ISO 504:1975 applies directly to industrial environments where turning operations rely on carbide-tipped tools for enhanced machining performance, durability, and precision. Key practical applications include:

• Manufacturing and Metalworking:
  The standard helps manufacturers correctly label tools for easy selection based on machining requirements, tool geometry, and carbide grade, improving efficiency and reducing errors in tool handling.

• Quality Assurance and Inventory Control:
  By adopting ISO 504 marking, companies can maintain consistent records and streamline management of tool stocks, preventing mismatches and ensuring compliance with machining specifications.

• International Trade and Standardization:
  The globally harmonized designation enables seamless exchange and verification of tool types among producers, distributors, and end-users across different countries, fostering compatibility and technical trust.

Related Standards

ISO 504:1975 complements and relies on the following ISO standards:

• ISO 243: Turning tools with carbide tips - External tools
• ISO 514: Turning tools with carbide tips - Internal tools
• ISO 513: Application of carbides for machining by chip removal - Designation of chip removal groups and application groups

These standards collectively create a coherent framework that governs the dimensions, applications, and identification of carbide-tipped turning tools, ensuring precision and universal understanding within the metal cutting and machining industry.

Implementing ISO 504:1975 ensures your carbide-tipped turning tools are marked and designated to international specifications, promoting usability, safety, and efficiency in all turning and machining operations.