Eagle Aluminum Cast Products

Dimensional Tolerance Standards

Eagle Aluminum Dimensional Tolerance Standards for Permanent Mold and Greensand Castings

The following are the normal dimensional tolerances that can be applied to as-cast parts produced from each of the available processes. Any deviation from these guidelines will be considered on a case by case basis. Specific part geometry may require or allow an increase or decrease in tolerance from this standard. Subsequent operations (e.g. grinding, pressing, machining, etc.) may improve tolerances on specific dimensions. Tolerances based on experience and on the Aluminum Association’s Standards for Aluminum Sand Castings.

LINEAR DIMENSIONS

PERMANENT MOLD

GREENSAND

1st Inch +/- 0.015″
Each Additional Inch +/-0.002″
 1-6″ +/- 0.015″
Each Inch Over 6″ Additional 0.003″

*3D PRINTED MOLD CASTINGS WOULD FOLLOW AIRSET TOLERANCES.

Misc. Callouts

PERMANENT MOLD

GREENSAND

ACROSS PARTING LINE–ADD to ABOVE +/-0.010″ for 0 – 10 in^2 0.030”
+/-0.015″ for 10 in^2 – 50 in^2
 +/-0.020″ for 50 in^2 – 100 in^2
MINIMUM WALL THICKNESS 0.125” .250”
DRAFT

*GREENSAND CASTING ANGLES CAN RANGE FROM SHARP TO .060″ ON RADII/ FILLETS DEPENDING ON DESIGN

Surface Finishes

  • PERMANENT MOLD CAST SURFACE FINISH: > 300 RMS
  • GREENSAND SURFACE FINISH: > 350 RMS