Permanent mold and sand castings can be produced with a variety of surface finishes, dimensional
precision, finish allowances and drafts. The flexibility of these forms of castings give the engineer and
manufacturer wide latitude in design to meet specific requirements. The Engineering Series is established
for the individual requirements involved in producing a usable, unmachined casting consistent with normal
production practices, reproducibility, reasonable mold or pattern life and maintenance costs, normal
inspection, packing and shipping procedures. Special requirements for finish, tolerances, etc., beyond the
standard may be specified where required although additional costs may be involved. Consultation with
the foundry will usually result in such requirements being properly considered in the quotation and mutually
understood. Conversely, more liberal values should be indicated where acceptable since they tend to keep
costs to a minimum.
These Engineering Standards are not designed to reduce quality level, lessen competition, restrict customer
requirements or increase costs. On the contrary, for the types of castings to which they may be applied, the
program will improve understanding of quality levels, widen the area of available sources of supply, increase
the customer’s ability to distinguish special requirements, and reduce costs by eliminating the specification
of unnecessary rigid limits where they are not required.
INTRODUCTION
ENGINEERING SERIES (E)
Copyright The Aluminum Association Inc. 1-3
Provided by IHS under license with AA
No reproduction or networking permitted without license from IHS Not for Resale
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AA 18-2008 history
2021AA 18-2021 Standards for Aluminum Sand and Permanent Mold Castings (SIXTEENTH EDITION)
2008AA 18-2008 Standards for Aluminum Sand and Permanent Mold Castings FIFTEENTH EDITION
2000AA 18-2000 Standards for Aluminum Sand and Permanent Mold Castings 14th Edition