Rough Casting Tolerance Standard(mm) – ISO 8062

Last modified: September 3, 2020
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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 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
1000		 630
1000
1600		 –
–
–		 –
–
–		 –
–
–		 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
1600
2500
4000
300		 2500
4000
6300
10000		 –
–
–
–		 –
–
–
–		 –
–
–
–		 –
–
–
–		 –
–
–
–		 –
–
–
–		 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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