Parallelism

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.

PARALLELISM
For surfaces in fixed relationship in the same mold section or member:
Up to 3 in. length .020
Additonal length over 3 in. .002 in./in.

For surfaces formed across the parting line:
Up to 3 in. length .025
Additional length over 3 in. .0025 in./in.

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