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Design Guide

These tolerances apply as a general rule of thumb. Closer tolerances can be obtained depending on part design or the use of special procedures or secondary operations.

Roundness - Solid Bars
Roundness is a function of normal shrinkage variations in the metal. Shrinkage variation increases with diameter and the tolerance required increases proportionately. A general rule of 0.127 mm per 25 mm may be applied.

Angles
As-cast tolerances of angles depend on their location in casting. They range from ± 1/2° for well supported positions to ± 2° where inherent distortion could be expected. Inclusion of gussets and ribs often minimizes distortion and many sections can be mechanically straightened.

Hole Positioning
0.127 mm per 25 mm from any single reference point.

Blind Holes
Blind holes can be cast if length does not exceed the diameter

Surface Finish
Average Ra value generally ranges between 3.20 to 5.50 microns

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