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Iron and Steel Rough Casting Tolerance
Standard
(ISO 8062:1994; SFSA2000;
BS6615:1996)
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 castings? Which casting process is suitable to
your products?
After years experience, we found many standards can
help you to solve these questions. Please check the
following table, you will find what tolerance grade
can be reached by every casting process. We have
referred to the standards 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 check our article
Rough Casting
Tolerance by Inch.
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. |
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