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Blog posts : "Tolerance"

General Tolerance : ISO-2768

Variations on dimensions without tolerances values are according to ISO 2768 for linear and angular dimensions. ISO 2768 is used to define the general tolerance on sheet-metal and plastic parts. For sheet-metal parts ISO 2768-m and for plastic parts ISO 2768-f is used as general tolerances 

This part of ISO 2768 is intended to simplify drawing indications and it specifies general tolerances for linear and angular dimensions without individual tolerance indications in four tolerance classes.

General Tolerances to DIN ISO 2768

General Tolerances for linear and angular Dimensions (DIN ISO 2768)

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Download Tolerance Stack-up Calculator

Tolerance stack-up are used to in mechanical engineering for calculating the effects of the accumulated variation in size in assembly. Tolerance stack-up analysis is done in assemblies to make sure everything fits perfectly.

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Basics of GD&T

Geometric Dimension & Tolerance (GD& T) is a system for defining engineering tolerances. GD&T is very important part of mechanical product design.

GD&T defines degree of accuracy and precision required on controlled feature of part and used to define the allowable variation in form and possible size of individual features allowable variation between features. 

Form Control

Form tolerances are applicable to single (individual) features or elements of single features. Form tolerances are not related to datum.



  • Straightness is a condition where an element of a surface or an axis is a straight line.
  • Straightness tolerance specifies a tolerance zone within which the considered element…

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Engineering Tolerance & Fits

As per ASME, Tolerance is the total amount a specific dimension is permitted to vary. e.g. a dimension representing as 25± 0.5 means that this dimension value can be in between 24.5 mm to 25.5 mm.

During mechanical product design, assembly tolerance stackup analysis is done to make sure part are getting assembled even in worst conditions.

Why Tolerance is required?

Interchangeability of manufactured parts is very critical. The production of closely mating parts, with very small tolerances is theoretically possible, but economically it’s unfeasible as this will increase rejection rate and high precise tools and workforce will be required. Increase in rejection rate and requirement of precise tool will increase overall product cost. This is the reason, deviation are provide…

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