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What standard can be used for the rough casting tolerance for iron and steel materials? How to choose suitable casting process for your iron and steel casting? Which casting process is suitable to your products?
Refer to the following table, you will find what tolerance grade can be reached by every casting process. We have referred to the standard of ISO 8062:1994, SFSA200 and BS6615:1996. and we hope these information will be helpful for you to choose a suitable casting process.
As for the imperial (inch) tolerance standard, please refer to Rough Casting Tolerance by Inch. The deviation of rough casting dimensions are related with the strength of molding sand, compactness of sand mold, liquid iron temperature, chemical components, moisture of sand and workers' operation. Any small factor may cause the deviation of dimensions. Sometimes, too strict requirements are not realistic. Some level of deviation is inevitable although we also try our best to control the deviation as small as possible.
Reachable Casting Tolerance Grades of Casting Processes
Conditions, Casting Processes |
Select Tolerance Grades |
| all sand molding process fully capable including hand molding, most appropriate for large castings |
CT 12-14 |
| appropriate for most casting types and sand molding processes |
CT 10-12 |
| Sand castings made by automatic moulding, molding machine and shell molding process. |
CT 8-10 |
| permanent metal moulding process and low pressure casting. |
CT 7-9 |
| lost wax investment casting process include water glass and silicon. Silicon is better than water glass. |
CT 5-7 |
BS 6615 : 1996 - Rough Casting Tolerances
Raw casting
basic dimension
mm |
Total casting tolerance
mm |
| over |
up to
and
including |
Casting tolerance grade CT |
| 1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
13 |
14 |
15 |
16 |
-
10
16 |
10
16
25 |
0.09
0.1
0.11 |
0.13
0.14
0.15 |
0.18
0.2
0.22 |
0.26
0.28
0.3 |
0.36
0.38
0.42 |
0.52
0.54
0.58 |
0.74
0.78
0.82 |
1
1.1
1.2 |
1.5
1.6
1.7 |
2
2.2
2.4 |
2.8
3
3.2 |
4.2
4.4
4.6 |
-
-
6 |
-
-
8 |
-
-
10 |
-
-
12 |
25
40
63 |
40
63
100 |
0.12
0.13
0.14 |
0.17
0.18
0.2 |
0.24
0.26
0.28 |
0.32
0.36
0.4 |
0.46
0.5
0.56 |
0.64
0.7
0.78 |
0.9
1
1.1 |
1.3
1.4
1.6 |
1.8
2
2.2 |
2.6
2.8
3.2 |
3.6
4
4.4 |
5
5.6
6 |
7
8
9 |
9
10
11 |
11
12
14 |
14
16
18 |
100
160
250 |
160
250
400 |
0.15
-
- |
0.22
0.24
- |
0.3
0.34
0.4 |
0.44
0.5
0.56 |
0.62
0.7
0.78 |
0.88
1
1.1 |
1.2
1.4
1.6 |
1.8
2
2.2 |
2.5
2.8
3.2 |
3.6
4
4.4 |
5
5.6
6.2 |
7
8
9 |
10
11
12 |
12
14
16 |
16
18
20 |
20
22
25 |
400
630
1 000 |
630
1 000
1 600 |
-
-
- |
-
-
- |
-
-
- |
0.64
-
- |
0.9
1
- |
1.2
1.4
1.6 |
1.8
2
2.2 |
2.6
2.8
3.2 |
3.6
4
4.6 |
5
6
7 |
7
8
9 |
10
11
13 |
14
16
18 |
18
20
23 |
22
25
29 |
28
32
37 |
1 600
2 500
4 000
6 300 |
2 500
4 000
6 300
10 000 |
-
-
-
- |
-
-
-
- |
-
-
-
- |
-
-
-
- |
-
-
-
- |
-
-
-
- |
2.6
-
-
- |
3.8
4.4
-
- |
5.4
6.2
7
- |
8
9
10
11 |
10
12
14
16 |
15
17
20
23 |
21
24
28
32 |
26
30
35
40 |
33
38
44
50 |
42
49
56
64 |
For sizes up to 16 mm, general tolerances form CT 13 to CT16 are not available. For these sizes individual tolerances shall be indicated.
Grade 16 exists only for wall thicknesses of castings generally specified to CT15. |
Releated References:
Casting
Sand Mold Casting Tolerances
Metal Casting Comparison Table
Metal Casting Processes Comparison Table
BS 6615 ISO 8062 Rough Casting Tolerance
ISO8062 BS6615 Iron Steel Rough Casting Tolerance Standard
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