Overview
EN ISO 6410-2:1996 (ISO 6410-2:1993) defines how screw thread inserts are represented on technical drawings. The standard specifies methods for the detailed (true-shape), conventional and simplified representation, plus rules for designation and dimensioning of inserts in mechanical engineering drawings. Its purpose is to ensure consistent, unambiguous communication between designers, manufacturers and users of threaded parts and fasteners.
Key topics and requirements
- Representation methods
- Detailed representation (true shape): shows the actual geometry and is intended for illustrations and catalogues; it should be avoided on technical drawings where possible.
- Conventional representation: the usual method for technical drawings; based on ISO 6410-1 conventions. On end views, external and internal crests are shown as full circles by a continuous thick line. The nominal diameter of the internal thread in the assembled condition shall not be shown.
- Simplified representation: shows only essential features and is recommended whenever possible; outlines of inserts in sections (external and internal crests) are shown by a continuous thick line (Type A, ISO 128). The insert itself is not hatched.
- Designation and dimensioning
- Use the designation given in the relevant international standards where available.
- If no standard exists, use the thread designation d × P (nominal diameter × pitch) followed by the letters INS (e.g., M30×1.5 INS).
- When a general indication suffices (e.g., "insert placed"), use the abbreviation INS.
- Additional information (manufacturer, catalogue number) may be added; designation can be shown with a leader line or as a dimension.
- Presentation rules
- Follow general drawing presentation rules (ISO 128) and the general conventions in ISO 6410-1.
- Simplified depictions should be used to reduce drawing complexity and improve clarity.
Applications and who uses it
- Mechanical designers and CAD drafters creating assembly and part drawings that include threaded inserts.
- Fastener and insert manufacturers preparing product documentation and catalogues.
- Procurement and quality engineers specifying or inspecting threaded insert fit, installation and documentation.
- Technical illustrators and documentation specialists ensuring consistent depiction of inserts across drawings.
Related standards
- ISO 6410-1:1993 - Technical drawings - Screw threads and threaded parts - Part 1: General conventions
- ISO 128:1982 - Technical drawings - General principles of presentation
Keywords: technical drawings, screw thread inserts, ISO 6410-2, screw threads, representation, designation, dimensioning, conventional representation, simplified representation, mechanical engineering drawings, CAD.
