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Sand Casting Tolerances

Dimensional Tolerances For Sand Castings

The values shown herein represent normal production practice at the most economic level. Greater accuracy involving extra close work or care in production should be specified only when and where necessary since additional costs may be involved. Conversely, more liberal values should be indicated when acceptable, as these tend to keep costs to a minimum. Any variations in these values shall not be binding on the foundry unless accepted in writing.



Greatest Dimension Tolerance on One
Side of Parting Line
Tolerance if Dimension
Crosses Parting Line
Tolerance of Flatness
0(0) – 6” (152.4) ± .063” (1.6) ± .090” (2.3) ± .060” (1.5)
6” (152.4) – 12”(304.8) ± .094” (2.4) ± .125” (3.2) ± .090” (2.3)
12” (304.8) – 18” (457.2) ± .125” (3.2) ± .188” (4.8) ± .125” (3.2)
18” (457.2) – 24”(609.6) ± .188” (4.8) ± .250” (6.4) ± .188” (4.8)
24” and up CONSULT FOUNDRY
 

Note:
If Dimension is made by a core and the associated dimension is:

0”(0) – 6”(152.4) add .015” (.4) to above tolerance.
6”(152.4) – 12”(304.8) add .03” to above tolerance.
12”(304.8) – 18”(457.2) add .045” (1.1) to above tolerance.
18”(457.2) – 24”(609.6)

add .060” (1.5) to above tolerance.

 

*****NOTE: Numbers in parentheises ( ) are in millimeters.*****

 

Draft:
A dimension pertaining to a surface requiring draft is measured at one point on that surface only. Draft will increase or decrease such dimensions.

Draft Angles (D):

Height of Draw Draft angle
.125” (3.2) – .250” (6.4) 8° – 15°
.250 (6.4) - .500” (12.7) 3° – 7°
.500” (12.7) – 1.000” (25.4) 2° – 3°
1.000” (25.4) – and up 1° – 2°
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