Industry Information

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The dimensional accuracy of castings is one of their key quality indicators, and casting dimensional tolerance standards serve as the objective basis for assessing this accuracy. Auderson Metal strictly adheres to the national standard GB/T6414-2017. For investment castings, the corresponding tolerance grade is selected based on the maximum nominal dimension, as follows: 1：When the maximum nominal dimension is ≤ 100, select grades DCTG4 through DCTG6. 2：100 < Maximum Nominal Dimension ≤ 400: Select Grade DCTG4 to DCTG8. 3：When the maximum nominal size exceeds 400, select grades DCTG4 through DCTG9. Casting Dimensional Tolerance (DCTG) Nominal Size Casting Dimensional Tolerance Grade (DCTG) and Corresponding Linear Dimension Tolerance Values Above Up to DCTG1 DCTG2 DCTG3 DCTG4 DCTG5 DCTG6 DCTG7 DCTG8 DCTG9 – 10 0.09 0.13 0.18 0.26 0.36 0.52 0.74 1 1.5 10 16 0.1 0.14 0.2 0.28 0.38 0.54 0.78 1.1 1.6 16 25 0.11 0.15 0.22 0.3 0.42 0.58 0.82 1.2 1.7 25 40 0.12 0.17 0.24 0.32 0.46 0.64 0.9 1.3 1.8 40 63 0.13 0.18 0.26 0.36 0.5 0.7 1 1.4 2 63 100 0.14 0.2 0.28 0.4 0.56 0.78 1.1 1.6 2.2 100 160 0.15 0.22 0.3 0.44 0.62 0.88 1.2 1.8 2.5 160 250 – 0.24 0.34 0.5 0.7 1 1.4 2 2.8 250 400 – – 0.4 0.56 0.78 1.1 1.6 2.2 3.2 400 630 – – – 0.64 0.9 1.2 1.8 2.6 3.6 630 1000 – – – 0.72 1 1.4 2 2.8 4  Casting Straightness Tolerance Nominal Size Casting Geometrical Tolerance Grade (GCTG) and Corresponding Straightness Tolerances Above Up to DCTG2 DCTG3 DCTG4 DCTG5 DCTG6 DCTG7 DCTG8 – 10 0.08 0.12 0.18 0.27 0.4 0.6 0.9 10 30 0.12 0.18 0.27 0.4 0.6 0.9 1.4 30 100 0.18 0.27 0.4 0.6 0.9 1.4 2 100 300 0.27 0.4 0.6 0.9 1.4 2 3 300…