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Tolerances

Functional Dimensions  
Inches
Millimetres
Dimension Tolerance Dimension Tolerance
Up to 0.500 ±.004" Up to 12.0 ± 0.10mm
Up to 0.500 ±.006" 12.0+ to 25.0 ± 0.15mm
1.000+ to 1.500 ±.008" 25.0+ to 37.0 ± 0.20mm
1.500+ to 2.000 ±.010" 37.0+ to 50.0 ± 0.25mm
2.000 + to 2.500 ±.012" 50.0+ to 62.0 ± 0.30mm
2.500+ to 3.500 ±.015" 62.0+ to 87.0 ± 0.35mm
3.500+ to 5.000 ±.018" 87.0+ to 125.0 ± 0.45mm
5.000+ to 7.500 ±.021" 125.0+ to187.0 ± 0.53mm
7.500+ to 10.000 ±.024" 187.0+ to 250.0 ± 0.60mm
10.000+ to 12.500 ±.027" 250.0+ to 312.0 ± 0.68mm
12.500+ to 15.000 ±.030" 312.0+ to 375.0 ± 0.75mm
Each additional inch add ± .001"
Each additional 25mm add ± .025mm
Non-Functional Dimensions
Where design parameters permit the above tolerances should be increased by 50%

Wall Thickness Tolerance
Special tolerances apply to wall thicknesses. The normal tolerance to be allowed is ± .008" (±0.20mm)
Large plain wall sections, above 75sq inches (500sq cm), should incorporate a tolerance of ±0.012" (±0.3mm)

Straightness/Flatness Tolerance
±0.004" (±0.10mm) per inch (per 25mm) excluding localised wax pattern depressions.

Angular Tolerance
±1/2°

Surface Finish
Typical surface finish - 80/100 microinches (2.0/2.5 micrometres). A finer surface finish is generally attainable when specifically requested.

Geometric Tolerances
Are dependant on the casting configuration and/or alloy specification, and would be discussed on an individual basis at the quotation stage.

Tritech Group