Overview
CEN ISO/TS 8062-2:2013 (Corrected 2013-11-01) - Geometrical Product Specifications (GPS) - Part 2: Rules - defines the rules and drawing conventions for dimensional and geometrical tolerances of moulded parts and parts machined from moulded parts. It specifies how to indicate tolerance requirements in technical product documentation and defines the proportions and dimensions of the graphical symbols used to represent moulded-feature completeness and part condition.
This Technical Specification is part of ISO 8062 (GPS for moulded/cast parts) and complements general GPS principles (ISO 8015) and default decision rules (ISO 14253-1).
Key Topics
- Scope and purpose: Rules for tolerancing final moulded parts and intermediate or final machined features derived from moulded parts.
- Drawing conventions: Designation on drawings, drawing type indicators (single/combined; final moulded, intermediate machined, final machined) and supplier machining identifiers.
- Graphical symbols: Standardized symbol proportions/dimensions and symbols that indicate the relative completeness of moulded features - distinct from larger surface texture symbols specified in ISO 1302.
- Part condition identifiers: Clear rules to mark part conditions (e.g., as-moulded, to-be-machined, final machined) on drawings.
- Required Machining Allowance (RMA): Rules for indicating machining allowance on moulded features.
- Tolerancing methods: Guidance for tolerancing final moulded parts, intermediate machined parts, and final machined parts, including multiple tolerancing methods and accumulation considerations.
- Annexes: Normative Annex A (graphical symbol dimensions) and informative annexes covering accumulation methods, calculation of nominal dimensions for features to be machined, multiple tolerancing examples, drawing examples, task assignment, and GPS matrix relation.
Applications
Who uses ISO/TS 8062-2:2013 and where it applies:
- Product designers and drafting engineers preparing technical drawings for moulded or cast components.
- Tooling and mold makers defining feature completeness and machining allowances.
- Quality engineers and metrology teams applying GPS tolerancing to inspection and verification plans.
- CAD modelers implementing tolerancing conventions in 3D models (distinguishing TEDs vs. plus/minus dimensions).
- Industries: foundry, die casting, injection molding, automotive, aerospace, industrial equipment and consumer products where moulded parts require post-mould machining or precise fit/function.
Practical benefits include consistent drawing communication, reduced ambiguity between as-moulded and machined requirements, and harmonized symbol usage across suppliers and inspection teams.
Related Standards
- ISO 129-1 (technical drawings - dimensions & tolerances)
- ISO 1101 (GPS - geometrical tolerancing)
- ISO 1302 (surface texture symbols - note: different/larger symbols)
- ISO 2692 (GPS - Maximum Material Requirement)
- ISO 8062-1 (vocabulary) and ISO 8062-3 (general tolerances and machining allowances)
Keywords: ISO/TS 8062-2:2013, Geometrical Product Specifications, moulded parts, dimensional tolerances, graphical symbols, drawing conventions, RMA, GPS.
