Overview
EN ISO 2538-2:2014 (ISO 2538-2:2014) is a Geometrical Product Specification (GPS) standard that specifies methods for the dimensioning and tolerancing of wedges. Although the illustrations use truncated wedges for simplicity, the rules apply to any wedge geometry. The standard is a GPS general standard and complements ISO 2538-1 (series of angles and slopes).
Key topics and technical requirements
- Characteristics and symbols: Defines wedge characteristics (slope, rate, slope angle β) and dimensional elements (heights H/h/Hx, thicknesses T/t/Tx, length L/Lx). Table-based preferred symbols guide drawing notation.
- Dimensioning rules: Advises that only necessary dimensions should be specified; auxiliary dimensions can be given in brackets. Typical dimensioning combinations are illustrated (e.g., heights specified, one height + angle, thicknesses, thickness + rate).
- Standardized angles: Recommends choosing wedge angles from the standardized series in ISO 2538-1.
- Tolerancing methods: Provides GPS methods to tolerance both the size and the sloped feature (surface form and orientation). Tolerance zones are typically defined by two parallel planes with the wedge angle β and separated by a distance t (the tolerance width). Illustrative methods show:
- Tolerance zones for individual sides or both sides of a wedge
- Datum-based location and orientation of tolerance zones (including Lx/Hx relationships)
- Use of the CZ modifier to lock tolerance zones together to control relative orientation
- Relationship to GPS system: References the GPS matrix model and inherits decision rules from ISO 8015 and ISO 14253-1. Notes that dimensional-only tolerancing may be insufficient for surface shape-ISO 1101 or ISO 14405-2 style geometric specifications may be needed for functional control.
Applications and users
This standard is practical for professionals who design, manufacture, inspect or document wedge-shaped components and tooling:
- Design and mechanical engineers specifying wedges in assemblies, jigs and fixtures
- Drafting and CAD teams applying consistent dimensioning/tolerancing conventions
- Quality, inspection and metrology engineers defining tolerance zones and measurement plans
- Toolmakers, fixture builders and suppliers of wedges and tapered parts
- Standards and compliance teams integrating GPS rules into product documentation
Using EN ISO 2538-2:2014 helps ensure unambiguous technical communication, consistent inspection criteria, and better interchangeability of wedge parts across suppliers.
Related standards
Keywords: EN ISO 2538-2:2014, ISO 2538-2, wedges, dimensioning and tolerancing, GPS, wedge angle, tolerance zone, CZ modifier, geometric product specification.