Overview
ISO/TS 8062-2:2013 - "Geometrical product specifications (GPS) - Dimensional and geometrical tolerances for moulded parts - Part 2: Rules" is a Technical Specification that defines the rules and conventions for applying geometrical dimensioning and tolerancing (GD&T) to moulded parts and to parts machined out of moulded parts. It covers how requirements are indicated in technical product documentation (TPD), specifies graphical symbol proportions, and provides symbols to identify the manufacturing condition of the part (final moulded, intermediate machined, final machined).
Key Topics
- Scope and definitions: Clarifies terms such as final moulded part, intermediate machined feature, final machined feature and moulded-part conditions.
- Symbols and graphical rules: Specifies letter and graphical symbols used to indicate part condition, tolerances and machining instructions; includes proportions and dimensions of symbols (Annex A).
- Drawing conventions: Rules for designation on drawings, single vs combined drawings, drawing type indicators and part-condition identifiers (see sections on drawing type indicator and drawing indications).
- Required Machining Allowance (RMA): Rules for indicating required machining allowance (A / RMA) and how to communicate machining responsibilities (supplier vs purchaser).
- Tolerancing rules: Guidance on tolerancing final moulded parts, intermediate machined parts and final machined parts; references to general tolerances and machining allowances (ISO 8062‑3).
- Annexes and examples: Practical annexes including accumulation methods, nominal dimension calculations, multiple tolerancing examples, drawing examples, task assignment and relation to the GPS matrix model (Annexes A–G).
- Limitations noted: The document is a TS intended to gather experience - some tolerancing methods for castings and GPS-conformant combinations are still under development.
Applications
- Who uses it: Design engineers, technical drafters, manufacturing engineers, quality engineers, toolmakers, suppliers and purchasers involved in producing or specifying moulded parts (castings, injection-moulded components, die-cast parts).
- Practical value:
- Ensures consistent GD&T communication on drawings for moulded and machined features.
- Clarifies when and how to specify machining allowances and supplier machining responsibilities.
- Reduces misinterpretation between designer and manufacturer, improving first-pass yield and inspection consistency.
- Useful in regulated sectors (automotive, aerospace, industrial equipment) where clear tolerancing of moulded components is critical.
Related Standards
For implementation, consult the full ISO/TS 8062-2:2013 document via ISO or your national standards body to apply the exact symbol dimensions, clause details and annex examples.