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Tolerance of Investment Casting
Time:2018-01-04

INTRODUCTION


iso2768 tolerance table

All features on component parts always have a size and a geometrical shape. For the deviation of size and for the deviations of the geometrical characteristics the function of the part requires limitations which, when exceeded, impair this function.


The tolerancing on the drawing should be complete to ensure that the elements of size and geometry of all features are controlled, i.e. nothing shall be implied or left to judgement in the workshop or in the inspection department.

The use of general tolerances for size and geometry simplifies the task of ensuring that this prerequisite is met.


GreatWell Metals performs the international tolerance standard ISO2768 for its metal precision casting products.


GERENRAL CASTING TOLERANCES


Table 1 - Permissible Deviations for Linear Dimensions Except for Broken Edges


Tolerance Class Permissible Deviations for Basic Size Range, in millimetres (mm)
Designation Description

0.5

 up to

3


over

 3

up to

6


over

6

up to

30

over

30

up to

120

over

120

up to

400

over

400

up to

1000

m medium ±0.1
±0.1
±0.2
±0.3
±0.5
±0.8
Note: For nominal sizes below 0.5mm, the deviations shall be indicated adjuacent to the relevant nominal size(s).



Table 2 - Permissible Deviations for Broken Edges (external radii and chamfer heights)


Tolerance Class Permissible Deviations for Basic Size Range, in millimetres (mm)
Designation Description

0.5

up to

3


over

3

up to

6

over

6

m medium ±0.2 ±0.5 ±1
Note: For nominal sizes below 0.5mm, the deviations shall be indicated adjuacent to the relevant nominal size(s).


Table 3 - Permissible Deviations of Angular Dimensions


Tolerance Class Permissible Deviations for Ranges of Lengths, in millimetres (mm)
Designation Description

up to

10


over

10

up to

50


over

50

up to

120

over

120

up to

400

over

400

f fine ±1˚
±0˚30'
±0˚30'
±0˚10' ±0˚5'

Aboved certain tolerance values is just of the standard tolerances. In case there is a special tolerance requirement for functional reasons, please feel free to contact us to check the possibility.


About GreatWell Metals
Founded in 2003, GreatWell Metals is an OEM manufacturer to provide the customers with the one-stop service for kinds of metal products.

ISO9001:2008 Factory

GreatWell Metals Company is an ISO9001:2008 certified factory of metal parts
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Jiangmen, Guangdong, China

E: leo@greatwellmetals.com

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