TOLERACE TABLES
IN ACCORDANCE WITH VDG-MARKBLATT P690
"Tolerances of investment castings are shown in the tables below. They are grouped into two levels - normal and premium. Normal tolerances are those that can be expected for production repeatability of casting dimension."
TABLE 1
LINEAR TOLERANCES
DIMENSION RANGE
OVER
UP TO
NORMAL PREMIUM
- 12 ± . 18 ± . 08
12 25 ± . 25 ± . 13
25 50 ± . 33 ± . 20
50 75 ± . 41 ± . 25
75 100 ± . 50 ± . 30
100 125 ± . 56 ± . 36
125 150 ± . 63 ± . 38
150 175 ± . 71 ± . 41
175 200 ± . 71 ± . 43
200 225 ± . 82 ± . 46
225 255 ± . 89 ± . 48
255 max ± . 1,00 ± . 50
 
 
TABLE 4
WALL THICKNESS
MATERIAL METRIC MINIMUM WALL (mm)
SMALL NORMAL
CARBON STEEL 1.27 2.03
400 SERIES STAINLESS 1.14 1.78
300 SERIES STAINLESS 1.02 1.52
ALUMINIUM 1.02 1.52
DUCTILE IRON 0.90 1.27
BERYLLUM COPPER 0.90 1.27
TABLE 2
HOLE TOLERANCES
DIAMETER NORMAL PREMIUM
up to 2 mm ± . 08 mm ± . 05 mm
up to 3 mm ± . 10 mm ± . 08 mm
up to 12 mm ± . 13 mm ± . 10 mm
up to 25 mm ± . 15 mm ± . 13 mm
over 37 mm see table 1
 
TABLE 3
GEOMETRICAL TOLERANCES
PROPERTIES BASIC SYMBOL
Flatness ± 0.10 per mm˛
Circularity ± 0.10 per mm˛
Cylindricity ± 0.10 per mm˛
Profile accuracy ± 0.15 per mm˛
From accuracy ± 0.10 per mm˛
Parallelity ± 0.10 per mm˛
Angular accuracy ± 30'
Posi. accuracy ± 0.10 per mm˛
Concentricy ± 0.10 per mm˛
Symmetry ± 0.10 per mm˛
TABLE 5
SURFACE FINISH
MATERIAL MICRO METERS
Ra Value
CARBON STEEL 2.25 - 3.20
400 SERIES STAINLESS 2.50 - 3.20
300 SERIES STAINLEES 2.25 - 3.20
ALUMINIUM 1.50 - 2.50
BERYLLIUM COPPER 1.50 - 2.50
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