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Casting Technical

  General Linear Tolerances

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

  Surface Finish

Metal

CLA Values
Micro-Inches Micro-Meters

As-Cast

Machined

As-Cast

Machined

Aluminum
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

  Aluminum Alloys

  General Linear Tolerances

Dimension
(in)

Tolerance
 (in)

Dimension
(mm)

Tolerance
(mm)

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

± 0.004
± 0.006
± 0.008
± 0.011
± 0.014
± 0.016

Up to 18
18-30
30-45
45-65
65-85
85-105

± 0.10
± 0.15
± 0.20
± 0.28
± 0.36
± 0.41

4.00-5.00
5.00-7.00
7.00-8.00
8.00-10.00
10.00-12.00
12.00-14.00

± 0.018
± 0.021
± 0.023
± 0.025
± 0.027
± 0.029

105-125
125-175
175-200
200-250
250-300
300-350

± 0.45
± 0.53
± 0.58
± 0.63
± 0.68
± 0.73

Other Features Angles:

 Angular Tolerances to ±½°

  Radii:

Internal & External normally ± 0.015 in, ± 0.44 mm

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.
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