Investment casting tolerances Specified by an international standard: VDG P690

Linear Tolerances

Nominal size
mm

D1 Tolerance
General dimensions

D2 Tolerance
Some functional  dimensions

to 6

± 0.15

± 0.12

6 to 10

± 0.18

± 0.14

10 to 18

± 0.22

± 0.17

18 to 30

± 0.26

± 0.20

30 to 50

± 0.40

± 0.31

50 to 80

± 0.45

± 0.37

80 to 120

± 0.55

± 0.44

120 to 180

± 0.80

± 0.65

180 to 250

± 1.20

± 0.95

250 to 315

± 1.30

± 1.10

315 to 400

± 1.80

± 1.40

 

Tolerances for straightness, flatness, parallelity, shape

Precision class

Length of the tolerated element

to 25 mm

25 to 50 mm

up to 50 mm

Allowed difference

D1

0.15 mm

0.25 mm

0.6%

D2

0.10 mm

0.20 mm

0.4%

 

Tolerances for angle values and right angles

Precision class

Nominal dimensions

to 30 mm

30 to 100 mm

100 to 200 mm

up to 200 mm

D1

Allowed deviation

Minute degree

30

30

30

20

mm / 100 mm

0.87

0.87

0.87

0.58

D2

Allowed deviation

Minute degree

30

20

15

15

mm / 100 mm

0.87

0.58

0.44

0.44

 

Surface quality according to ISO R 468, DIN 4769 and VSM 10321

 

Ra

Rz

Rt

N9

6.3

23-32

25-38