Investment Casting Manufaturer
 
 
 
 
Investment Casting Tolerances
 
 
Tolerances
Applicable Ref. Tolerance Standards are IS 11166, ISO 2768, VDG-P690.DIN1680, Class 2.

Actual tolerance depends on Geometry of a component.

Generic tolerances maintained :
 
Dimensional Tolerance »
Permissible Deviations on Dimensions, Class 2
Nominal dimensions of Rough Castings Over all Dimensions
Over Up to Up to 6 Over
6 up to 10
Over
10 up to 18
Over
18 up to 30
Over
30 up to 80
Over
80 up to 180
Over
180 up to 300
Over
300 up to 500
  6 0.10 0.12 0.15 0.20 0.25 0.25 0.30 0.35
6 10 ----- 0.12 0.15 0.25 0.25 0.30 0.35 0.45
10 18 ----- ----- 0.20 0.30 0.35 0.35 0.40 0.55
18 30 ----- ----- ----- 0.30 0.40 0.45 0.50 0.65
30 80 ----- ----- ----- ----- 0.45 0.55 0.60 0.75
80 180 ----- ----- ----- ----- ----- 0.60 0.70 0.90
180 300 ----- ----- ----- ----- ----- ----- 1.00 1.15
300 500 ----- ----- ----- ----- ----- ----- ----- 2.00
 
Concentricity »
Permissible Deviations on Centre to Centre, Distance between Holes, Bosses etc.
Nominal Dimensions Nominal Dimensions Permissible Deviation
Over Up to Class 2
  6 0.125
6 10 0.125
10 18 0.15
18 30 0.25
30 80 0.35
80 180 0.45
180 300 0.70
300 500 0.90
Machining Allowance »
Permissible Machining Allowance
Nominal Dimension Overall Dimensions (mm/face)
Over Up to 6 06-10 10-18 18-30 30-80 80-180 100-300
----- 6 0.3 0.35 0.4 0.5 0.7 1 1
6 10 ----- 0.35 0.4 0.5 0.7 1.25 1.5
10 18 ----- ----- 0.5 0.6 0.7 1.25 1.5
18 30 ----- ----- ----- 0.6 0.8 1.4 1.75
30 80 ----- ----- ----- ----- 1 1.6 2
80 180 ----- ----- ----- ----- ----- 2 2.25
180 300 ----- ----- ----- ----- ----- ----- 3
Angle »
Permissible Deviations on Angles
Permissible deviations on specified angles for Class 2 is ± 1°
 
Surface Finish »
Permissible Deviations on Surface Roughness
Surface roughness would be between 3.0Ra to 6.0Ra