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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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