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ISO 9001:2008  

ANGULARITY, PARALLELISM AND PERPENDICULARITY

The angularity (including parallelism and perpendicularity) tolerance is the total deviation between two planes within which the entire surface so toleranced must lie. The planes of deviation (tolerance zone) forms the basic angle to the datum plane. Tolerances are for draft free surfaces (see Draft standard). To establish planes see Flatness standard.

PERPENDICULARITY
For one surface formed by a mold section and the other surface by a core set in the same mold section:
Up to 3 in. length .025
Additional length over 3 in. .0025 in./in.

For one surface formed by a mold section and the other surface by a core located acoss the parting line, or surfaces formed by two cores in the same mold section:
Up to 3 in. length .030
Additonal length over 3 in. .003 in./in.

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St. Paul Foundry
954 Minnehaha Avenue West
Saint Paul, Minnesota 55104
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