BS ISO 15786:2008 Technical drawing. Simplified representation and dimensioning of holes
BS ISO 15786 has been established to specify the simplified representation and dimensioning of holes. It establishes rules to determine, unambiguously, methods for the representation — both complete and simplified — and the dimensioning of holes, as well as the structure and sequence of the descriptive elements for the simplified representation of holes.
Contents of BS ISO 15786:
Foreword
Introduction
Scope
Normative references
Terms and definitions
Methods of representation and dimensioning of holes
Complete representation and complete dimensioning of holes
Complete representation and simplified dimensioning of holes
Simplified representation and simplified dimensioning of holes
Representation of holes on the same drawing
Structure of dimensioning of holes
Structure and sequence of descriptive elements for simplified dimensioning of holes
Graphical symbols
Number of groups of holes and number of holes in a group
Indication of tolerances
Hole bottom
Countersinks and chamfers
Depth dimensions
Indication of surface texture
Indication of dimensions on geometrical tolerances
Examples for representation and dimensioning of holes, counterbores and internal threads
Bibliography