DIN 1684 - General tolerances and machining allowances
for malleable cast iron castings
This standard is for stipulating the general dimensional tolerances
of rough malleable iron castings, including the thickness tolerance.
Moreover, it also shows the permissible machining allowances for
this type of cast iron.
Table 1. Permissible deviations for linear dimensions (length,
width, height, centre line distance, diameter, radii)
| Grade |
Relation to molds |
Basic size range (mm) |
to
10 |
10
to
18 |
to
18 |
18
to
30 |
30
to
50 |
50
to
80 |
80
to
120 |
120
to
180 |
180
to
250 |
250
to
315 |
315
to
400 |
400
to
500 |
500
to
630 |
630
to
800 |
800
to
1000 |
DIN 1680 |
| GTA 17/5 |
Intrinsic |
±0.9 |
±1. |
±1.1 |
±1.3 |
±1.6 |
±1.9 |
±2.2 |
±2.5 |
±2.9 |
±3.2 |
±3.7 |
±4.1 |
±4.4 |
±5 |
±5.5 |
GTA 17/5 |
| Not Intrinsic |
±1.2 |
±1.4 |
±1.4 |
±1.6 |
±1.9 |
±2.2 |
±2.5 |
±2.8 |
±3.2 |
±3.5 |
±4 |
±4.4 |
±4.7 |
±5.3 |
±5.8 |
GTA 17/5 mit |
| GTA 17 |
Intrinsic |
±0.75 |
±0.9 |
±0.9 |
±1.1 |
±1.3 |
±1.5 |
±1.8 |
±2 |
±2.3 |
±2.6 |
±2.9 |
±3.2 |
±3.5 |
±4 |
±4.5 |
GTA 17 |
| Not Intrinsic |
±1.1 |
±1.2 |
±1.2 |
±1.4 |
±1.6 |
±1.8 |
±2.1 |
±2.3 |
±2.6 |
±2.9 |
±3.2 |
±3.5 |
±3.8 |
±4.3 |
±4.8 |
GTA 17 mit |
| GTA 16/5 |
Intrinsic |
±0.6 |
±0.7 |
±0.7 |
±0.8 |
±1 |
±1.2 |
±1.3 |
±1.6 |
±1.8 |
±2 |
±2.2 |
±2.4 |
±2.7 |
±3.1 |
±3.6 |
GTA 16/5 |
| Not Intrinsic |
±0.9 |
±1 |
±1 |
±1.1 |
±1.3 |
±1.5 |
±1.6 |
±1.9 |
±2.1 |
±2.3 |
±2.5 |
±2.7 |
±3 |
±3.4 |
±3.9 |
GTA 16/5 mit |
| GTA 16 |
Intrinsic |
±0.45 |
±0.55 |
±0.55 |
±0.65 |
±0.8 |
±0.95 |
±1.1 |
±1.3 |
±1.5 |
±1.6 |
±1.8 |
±2 |
±2.2 |
±2.5 |
±2.8 |
GTA 16 |
| Not Intrinsic |
±0.75 |
±0.85 |
±0.85 |
±0.95 |
±1.1 |
±1.3 |
±1.4 |
±1.6 |
±1.8 |
±1.9 |
±2.1 |
±2.3 |
±2.5 |
±2.8 |
±3.1 |
GTA 16 mit |
Intrinsic - means the tolerance only caused by one set of molds,
patterns.
Not Intrinsic - means the tolerance caused by two or more sets of
mold, patterns.
Table 2. Permissible machining allowance
| mm |
to
50 |
50
to
120 |
120
to
250 |
250
to
400 |
400
to
500 |
500
to
800 |
800
to
1000 |
machining
allowance |
1.5 |
1.5 |
1.5 |
2 |
2 |
2.5 |
3 |
Table 3. Tolerances for thickness dimensions
| mm |
to
6 |
6
to
10 |
10
to
18 |
18
to
30 |
30
to
50 |
50
to
120 |
| A |
±1.5 |
±2.5 |
±2.5 |
±3.5 |
±3.5 |
±4.5 |
| B |
±1 |
±2 |
±2 |
±2.5 |
±2.5 |
±2.5 |
| C |
+0.9
-0.8 |
+1.1
-0.9 |
+1.4
-1.1 |
+1.7
-1.3 |
+2
-1.6 |
- |
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