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Tolerances in Metal Casting

Metal casting tolerances are depended on the type of material (or metal) being cast. The casting tolerance itself refers to the unwanted but acceptable deviation from the desired dimensions. An accurate dimension thus requires a tighter tolerance.

A tolerance limit in metal casting is the limiting values between which the measurements of a part must be in order to be acceptable.

Geometric tolerance, or geometric dimensioning and tolerancing (GD & T), is a type of system used for both defining and communicating engineering tolerances. While dimensioning specifications refers to the as-intended geometry, the tolerancing refers to the allowable variation.

The purpose of a linear tolerance is to determine both the size as well as the location of features within the part relative to these features' specific lower and upper tolerance limits. This space between the two limits are what is called the tolerance zone.

The higher (or tighter ) the tolerance of a part, the higher the cost of manufacturing said part.

 

 

Investment Casting

Geometric Tolerances:

Note: You can click on the table below to view a larger image.

Investment Casting Geometric Tolerances

Note: Numbers are rounded off to nearest decimal.

Linear Tolerances:

Note: You can click on the table below to view a larger image.

Investment Casting Linear Tolerances

Note: Numbers are rounded off to nearest decimal.

*Please Note: These are just the lowest and highest dimension, please refer to How Precise is Investment Casting for more in-depth information.

Sand Casting

Dimensional Tolerances:

Note: You can click on the table below to view a larger image.

Sand Casting Dimensional Tolerances

Note: Numbers are rounded off to nearest decimal.

*Note: For a more in-depth look at the functional and non-functional dimensions in reference to tolerances in sand casting, please visit our Sand Casting Tolerances page.

Die Casting

Minimum tolerances for precision aluminum die casting:

Note: You can click on the table below to view a larger image.

Die Casting Minimum Tolerances for Precision Aluminum Die Casting

Note: Numbers are rounded off to nearest decimal.

Note that these tolerances are only the basic tolerances. For more information on linear tolerances, tolerances for parting lines, flatness and tolerances for moving die parts in die casting, please visit our Die Casting page.

Permanent Mold Casting

Also referred to as gravity die casting, it has the following casting tolerance standards:

Note: You can click on the table below to view a larger image.

Permanent Mold Casting Casting Tolerance Standard

Note: Numbers are rounded off to nearest decimal.

Visit our Permanent Mold (Gravity) Die Casting Tolerances page for more in-depth information concerning tolerances in permanent mold casting.

Plaster Casting

The following casting tolerances apply to plaster mold casting:

Note: You can click on the table below to view a larger image.

Plaster Casting Tolerances

Note: Numbers are rounded off to nearest decimal.

Back to Main Page: Metal Casting

Further Suggested Reading:

 

 

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