Investment Castings Tolerances Iron, Steel & Copper Alloys
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General
Linear Tolerances
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|
Dimension
(in) |
Tolerance
(in) |
|
Dimension
(mm) |
Tolerance
(mm) |
|
Up
to 0.5
Up to 1.0 Over 1.0 |
±
0.003
± 0.005 ± 0.007 per inch |
|
Up
to 13
Up to 25 Over 25 |
±
0.10
± 0.13 ± 0.13 per 25mm |
|
Straightness
|
|
Length
(in) |
As-Cast
(in) |
Corrected
(in) |
|
Length
(mm) |
As-Cast
(mm) |
Corrected
(mm) |
|
2
2-4 4-6 6-8 |
±
0.020
± 0.030 ± 0.040 ± 0.060 |
±
0.010
± 0.015 ± 0.020 ± 0.025 |
|
50
50-100 100-150 150-200 |
±
0.50
± 0.75 ±1.00 ± 1.50 |
±
0.25
± 0.35 ±0.50 ± 0.65 |
|
Flatness
|
|
Length
(in) |
As-Cast
(in) |
Corrected
(in) |
|
Length
(mm) |
As-Cast
(mm) |
Corrected
(mm) |
|
1
2 3 4 |
0.008
0.015 0.020 0.025 |
0.004
0.006 0.008 0.010 |
|
25
50 75 100 |
0.20
0.35 0.50 0.65 |
0.10
0.15 0.20 0.25 |
|
Roundness
|
|
Outside
Diameter
(in) |
Tolerance
(in) |
Inside
Diameter
(in) |
Tolerance
(in) |
|
Outside
Diameter
(mm) |
Tolerance
(mm) |
Inside
Diameter
(mm) |
Tolerance
(mm) |
|
0.5
1.0 1.5 2.0 |
±
0.010
± 0.020 ± 0.025 ± 0.030 |
Up
to 0.25
0.25-0.50 0.50-1.0 Above 1.0 |
±
0.012
± 0.016 ± 0.020 ± 0.020 per inch |
|
12.5
25.0 37.5 50 |
±
0.25
± 0.50 ± 0.60 ± 0.75 |
Up
to 6.25
6.25-12.5 12.5-25.0 Above 25.0 |
±
0.30
± 0.40 ± 0.50 ± 0.50 per 25mm |
|
Concentricity
|
|
Outside
Diameter
(in) |
Tolerance
(in) |
Eccentricity
As-Cast
(in) |
Corrected
(in) |
|
Outside
Diameter
(mm) |
Tolerance
(mm) |
Eccentricity
As-Cast
(mm) |
Corrected
(mm) |
|
0.75
1.00 1.50 2.00 |
0.25
0.50 0.75 1.00 |
±
0.004
± 0.005 ± 0.008 ± 0.010 |
±
0.004
± 0.005 ± 0.005 ± 0.008 |
|
18.75
25.00 37.50 50.00 |
6.25
12.50 18.75 25.00 |
±
0.10
± 0.13 ± 0.20 ± 0.25 |
±
0.10
± 0.13 ± 0.13 ± 0.20 |
|
Parallelism
|
|
Gap
(in) |
Tolerance
As-Cast (in)
|
Corrected
(in) |
|
Gap
(mm) |
Tolerance
As-Cast (mm)
|
Corrected
(mm) |
|
0.25
0.50 0.75 1.00 |
±
0.003
± 0.005 ± 0.006 ± 0.007 |
±
0.003
± 0.004 ± 0.004 ± 0.005 |
|
6.25
12.50 18.65 25.00 |
±
0.08
± 0.13 ± 0.15 ± 0.18 |
±
0.08
± 0.10 ± 0.10 ± 0.13 |
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Surface
Finish
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Metal
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CLA
Values
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Micro-Inches
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Micro-Metres
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As-Cast
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Machined
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As-Cast
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Machined
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Aluminium
Copper Alloys Carbon Steels Stainless Steels |
80-100
60-100 90-125 90-135 |
40-100
40-100 60-125 60-125 |
|
2.0-2.5
1.5-2.5 2.3-3.2 2.3-3.3 |
1.0-2.5
1.0-2.5 1.5-3.2 1.5-3.2 |
Aluminium Alloys
|
General
Linear Tolerances
|
|
Dimension
(in) |
Tolerance
(in) |
|
Dimension
(mm) |
Tolerance
(mm) |
|
Up
to 0.75
0.75-1.25 1.25-1.75 1.75-2.50 2.50-3.25 3.25-4.00 4.00-5.00 5.00-7.00 7.00-8.00 8.00-10.00 10.00-12.00 12.00-14.00 |
±
0.004
± 0.006 ± 0.008 ± 0.011 ± 0.014 ± 0.016 ± 0.018 ± 0.021 ± 0.023 ± 0.025 ± 0.027 ± 0.029 |
|
Up
to 18
18-30 30-45 45-65 65-85 85-105 105-125 125-175 175-200 200-250 250-300 300-350 |
±
0.10
± 0.15 ± 0.20 ± 0.28 ± 0.36 ± 0.41 ± 0.45 ± 0.53 ± 0.58 ± 0.63 ± 0.68 ± 0.73 |
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Other
Features
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Angles:
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Angular
Tolerances to ±½°
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Radii:
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Internal
& External normally ± 0.015 in, ± 0.44 mm
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Note All the above tolerances are a general guide and may vary due to casting design and alloy selected. Certain dimensions may be held to closer Tolerances if required after design evaluation by us.