MIL-A-21180D
5 November 1984
SUPERSEDING
MIL-A-21180C
15 January 1964
MILITARY SPECIFICATION
ALUMINUM-ALLOY CASTINGS, HIGH STRENGTH
This specification is approved for use by all Departments and Agencies of the Department of
Defense.
1. SCOPE
1.1 Scope. This specification covers the requirements for six alloy compositions, four
inspection classes, four radiographic quality grades and six classes of mechanical properties of
high strength aluminum-alloy castings.
1.2 Classification. Aluminum-alloy castings shall be furnished in the following compositions,
grades and classes, as specified (see 6.2.1):
1.2.1 Composition. The chemical composition of the castings shall conform to Table I,
which consists of alloys A201.0, 354.0, C355.0, A356.0, A357.0 and 359.0. Unified Numbering
System (UNS) for these alloys are: A12010, A03540, A33550, A13560, A13570 and A03590
respectively.
1.2.2 Inspection class. Castings shall be classified with respect to criticality of application as
defined by MIL-STD-2175, and each casting drawing shall specify the class required for the
application (see 6.2.1).
Beneficial comments (recommendations, additions, deletions) and any pertinent data which
may be of use in improving this document should be addressed to: Systems Engineering and
Standardization Department (Code 93), Naval Air Engineering Center, Lakehurst,
NJ 08733, using the self-addressed Standardization Document Improvement proposal
(DD Form 1426) appearing at the end of this document or by letter.
NO DELIVERABLE DATA
REQUIRED BY THIS DOCUMENT
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