ASTM B666/B666M-20

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it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: B666/B666M − 19 B666/B666M − 20
Standard Practice for
Identification Marking of Aluminum and Magnesium
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Products
This standard is issued under the fixed designation B666/B666M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
1.1 This practice establishes the physical item marking requirements for identification purposes for aluminum and magnesium
products. Package marking for shipment and inspection acceptance is not within the scope of this standard.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system mayare not benecessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used
independently of the other. Combiningother, and values from the two systems may result in non-conformance with the
standard.shall not be combined.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 The following documents of the issue in effect on the date of material purchase form a part of this specificationpractice to the
extent referenced herein:
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2.2 ASTM Standards:
B361 Specification for Factory-Made Wrought Aluminum and Aluminum-Alloy Welding Fittings
B404/B404M Specification for Aluminum and Aluminum-Alloy Seamless Condenser and Heat-Exchanger Tubes with Integral
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Fins (Withdrawn 2006)
B881 Terminology Relating to Aluminum- and Magnesium-Alloy Products
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2.3 ANSI Standards:
ANSI H35.1/H35.1M Alloy and Temper Designation Systems for Aluminum
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This practice is under the jurisdiction of ASTM Committee B07 on Light Metals and Alloys and is the direct responsibility of Subcommittee B07.03 on Aluminum Alloy
Wrought Products.
Current edition approved Nov. 1, 2019Nov. 1, 2020. Published November 2019November 2020. Originally approved in 1980. Last previous edition approved in 20152019
as B666/B666M – 15.B666/B666M – 19. DOI: 10.1520/B0666_B0666M-19.10.1520/B0666_B0666M-20.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
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The last approved version of this historical standard is referenced on www.astm.org.
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Available from Aluminum Association, Inc., 1400 Crystal Drive,Dr., Suite 430, Arlington, VA 22202 (http://www.aluminum.org).22202, http://www.aluminum.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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B666/B666M − 20
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2.4 Military Standards:
MIL-STD-409 Alloy Nomenclature and Temper Designation System for Magnesium Base Alloys
3. Terminology
3.1 DefinitionsDefinitions:—
3.1.1 Refer to Terminology B881 for definitions of product terms used in this practice.Refer to Terminology B881 for definitions
of product terms used in this specification.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 Marking:
3.2.2 spot marking—marking the identification only once on the product.
3.2.3 continuous marking—recurring marking of the identification in intervals not greater than 40 in. [1000 mm] throughout the
length of the product.
3.2.4 perimeter marking—marking continuously the identification in one or two rows adjacent to the four edges of the product.
3.2.1 tagging—Marking: attaching tags bearing the required identification markings to coils, bundles, or containers of items which
are too small to mark or whose configuration preclude marking otherwise.
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