Engineering essentials

BS 8888: The essentials

This introductory course provides an essential understanding of dimensioning and tolerancing and the symbolic language of GD&T within BS 8888.

2 days

Members: £995 + VAT
Non-members: £1,215 + VAT

Course Location & Date
BS 8888: The essentials


£995.00 Plus vat
Non Members:
£1,215.00 Plus vat


This introductory course provides an essential understanding of dimensioning and tolerancing and the symbolic language of GD&T within BS 8888.

BS8888 Technical Product Documentation and Specification is the UK national standard for producing mechanical part technical drawings and CAD models. Originally named BS 308, it has undergone a series of revisions resulting in the latest version BS 8888:2017.

The course will bring you up to date with the latest version of BS 8888, including the meaning of design intent; how mechanical parts are dimensioned and tolerance within the standard in order to meet design intent and avoid ambiguity of specification; symbology, datums and geometrical tolerances; and the relationship to ISO GPS standards such as ISO 8015, 5459, 1101, 5458, 2692 etc.

It is supported with demonstrations, models, case studies, questions, exercises and calculations. You are encouraged to bring your own questions to the course. 

Who should attend?

This course is suitable for anyone who creates, edits or reads mechanical engineering part drawings to the UK national standard BS 8888, such as mechanical engineering designers, drafters and checkers, manufacturing and quality engineers, technical managers, technicians, machinists, toolmakers and inspectors.

How will I benefit?

After the course you will be able to: 

  • Understand the meaning of design intent
  • Dimension and tolerance to meet design intent and remove ambiguity
  • Understand the relationship of BS 8888 to ISO GPS standards
  • Have an essential understanding of the symbolic language of GD&T
  • Understand how TEDs and datums work and how to select them
  • Understand the 14 geometric tolerances and what each one can do
  • Dimension and tolerance a feature to guarantee it will assemble with a mating part
  • Understand how tolerance modifiers are used
Contributes 14 CPD hours

Key topics

  • Design intent
  • Fundamental principles of dimensioning and tolerancing
  • Size and the envelope requirement
  • The differences between +/- tolerancing and GD&T
  • TEDs, datums and constraint
  • The 14 geometric tolerances, their applications and tolerance zones
  • How to apply geometric tolerances
  • Guaranteeing the assembly of mating parts
  • Ways of modifying geometric tolerances
  • Edge conditions
  • Surface finish

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At a glance

  • Duration:
    2 days
  • CPD Hours:

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