BS EN ISO 1101:2017 - TC

What is this standard about?

This is an engineering drawing standard about geometrical tolerancing. It defines the symbol language for the geometrical specification of workpieces and the rules for their interpretation. It is part of the BS 8888 family on technical product documentation and specification.

Who is this standard for? 

It will typically be used in the aerospace, defence, automotive, rail and nuclear sectors but is equally applicable to any engineering or manufacturing organization needing to produce engineering drawings in 2D or 3D. Users will be: 

• Mechanical engineers
• Design engineers
• Manufacturing engineers
• Engineering designers
• Design agencies

Why should you use this standard?

This updated standard makes sure that all geometrical tolerancing requirements can be applied to 3D CAD models as well as to 2D engineering drawings. It will help design engineers specify their products more accurately and unambiguously. 

What’s changed since the last update?

Tools have been added to:

• Allow tolerancing of associated features 
• Specify the constraints to the tolerance zone
• Specify the filtering of the toleranced feature and a line type has been designated for its illustration

As well, some of the existing tolerancing rules have been clarified to improve user-friendliness.