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ISO System of Limits, Fits & Tolerances for Engineering Parts - A practical approach

Focus Areas

  • ISO system of Limits, Fits and tolerances
  • Designation – Holes and shafts
  • Fundamental deviations A to ZC
  • Fundamental deviation charts for holes and shafts
  • IT tolerance grade – IT 01 to IT 18
  • Practical significance of fundamental deviation and tolerance grade
  • Manufacturing processes vs tolerance grades
  • Calculating limits by referring tables
  • Types of Fits with examples
    • Clearance Fit
    • Interference Fit
    • Transition Fit
  • Calculating allowance – Minimum and Maximum clearance
  • Commonly used fits for engineering applications
  • Hole basis vs shaft basis system
  • Surface roughness and its measurement Representing surface roughness in drawing


Engineering design and Engineering drawing are never complete without assigning tolerances. Tolerancing is an important and essential element of mass production and interchangeable manufacturing. Tolerances attempt to balance the use of a product with the cost required to produce that product. Improper tolerancing can result in parts that do not function in the way they were intended or parts produced with dimensions that are more precise than necessary, adding unwanted cost to production.

During the entire Design thro Manufacturing process, proper use of fits & tolerances is very crucial in order to bring out quality end products at optimum cost. Hence sound knowledge in Limits, Fits & Tolerances is essential for engineers involved in design, engineering, production, assembly and quality functions of Engineering Industries

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