ASTM B86-09a

    Standard Specification for Zinc and Zinc-Aluminum (ZA) Alloy Foundry and Die Castings

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    1. Scope

    1.1 This specification covers commercial zinc, zinc-aluminum castings and continuous cast bar stock, as designated and specified in Table 1. Seven alloy compositions are specified and designated as follows:

    CommonTraditional ASTM AUNS
    Alloy 3Zamak 3AG 40A BZ33520
    Alloy 7Zamak 7AG 40BZ33523
    Alloy 5Zamak 5AC 41A BZ35531
    Alloy 2Zamak 2AC 43AZ35541
    ZA-12 ZA-12...Z35631
    ZA-27 ZA-27...Z35841

    A See Table 1, Footnote C.

    B SAE Specification, Nos. 903 and 925 conform to the requirements for alloys AG40A and AC41A, respectively.

    1.2 Zinc Alloys Z33520, Z33523, Z35531, and Z35541 are used primarily in the manufacture of pressure die castings. Zinc-Aluminum Alloys Z35636, Z35631, and Z35841 are used in the manufacture of both foundry and pressure die castings. These alloys are also fabricated into continuous cast bar stock used for prototyping and screw machine stock.

    1.3 The values stated in inch-pound units are to be regarded as standard.

    1.4 Systems of nomenclature used to designate zinc and zinc-aluminum (ZA) alloys used for casting are described in Appendix X1.

    1.5 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 become familiar with all hazards including those identified in the appropriate Material Safety Data Sheet (MSDS) for this product/material as provided by the manufacturer, to establish appropriate safety and health practices, and determine the applicability of regulatory limitations prior to use.

    TABLE 1 Chemical Requirements

    ElementAlloy 3A,B,C,D
    Zamak 3
    Alloy 7A ,B,C,D
    Zamak 7
    Alloy 5A,B,C,D
    Zamak 5
    Alloy 2A,C,,D

    ZA-12A,C ,E


    Aluminum3.7-4.33.5-4.33.7-4.3 3.7-4.38.0-8.810.5-11.525.0-28.0
    Magnesium0.02-0.06F 0.005-0.0200.02-0.06F0.02-0.06 0.01-0.030.01-0.030.01-0.02
    Copper 0.1 maxG0.25 max0.7-1.22.6-3.30.8-1.30.5-1.2 2.0-2.5
    Iron, max0.050.0750.050.050.0750.0750.075
    Lead, max0.0050.0030.005 0.0050.0060.0060.006
    Cadmium, max0.0040.0020.004 0.0040.0060.0060.006
    Tin, max0.0020.0010.002 0.0020.0030.0030.003
    Nickel . . .0.005-0.020. . .. . .. . .. . .. . .
    ZincHremainder remainderremainderremainder remainderremainderremainder

    A For purposes of acceptance and rejection, the observed value or calculated value obtained from analysis should be rounded to the nearest unit in the last right-hand place of figures, used in expressing the specified limit, in accordance with the rounding procedure prescribed in Practice E 29.

    B Zinc alloy castings may contain nickel, chromium, silicon, and manganese in amounts of 0.02, 0.02, 0.035, and 0.06 %, respectively. No harmful effects have ever been noted due to the presence of these elements in these concentrations and, therefore, analyses are not required for these elements, with the exception of nickel analysis for Z33522.

    C ASTM alloy designations were established in accordance with Practice B 275. The UNS designations were established in accordance with Practice E 527. The last digit of a UNS number differentiates between alloys of similar composition. The UNS designations for ingot and casting versions of an alloy were not assigned in the same sequence for all alloys.

    D When this material is required to conform to ISO 301, the chemical limits for thallium and indium each shall not exceed 0.001 %.

    E Zinc-aluminum ingot for foundry and pressure die casting may contain chrome, manganese, or nickel in amounts of up to 0.01 % each or 0.03 % total. No harmful effects have ever been noted due to the presence of these elements in up to these concentrations and, therefore, analyses are not required for these elements.

    F Magnesium may be as low as 0.015 % provided that the lead, cadmium, and tin do not exceed 0.003, 0.003, and 0.001 %, respectively.

    G For the majority of commercial applications, a copper content up to 0.7 % will not adversely affect the serviceability of die castings and should not serve as a basis for rejection, unless otherwise specified in the contract or purchase order between the producer and user, such as to meet the requirements of ISO 15201.

    H Determined arithmetically by difference.

    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    Military Specification


    ASTM Standards

    B240 Specification for Zinc and Zinc-Aluminum (ZA) Alloys in Ingot Form for Foundry and Die Castings

    B275 Practice for Codification of Certain Zinc, Tin and Lead Die Castings

    B557 Test Methods for Tension Testing Wrought and Cast Aluminum- and Magnesium-Alloy Products

    B899 Terminology Relating to Non-ferrous Metals and Alloys

    B949 Specification for General Requirements for Zinc and Zinc Alloy Products

    E8/E8M Test Methods for Tension Testing of Metallic Materials

    E23 Test Methods for Notched Bar Impact Testing of Metallic Materials

    E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

    E88 Practice for Sampling Nonferrous Metals and Alloys in Cast Form for Determination of Chemical Composition

    E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)

    E536 Test Methods for Chemical Analysis of Zinc and Zinc Alloys

    E634 Practice for Sampling of Zinc and Zinc Alloys for Analysis by Spark Atomic Emission Spectrometry

    Federal Standard

    Fed. Std. No. 123 Marking for Shipment (Civil Agencies)

    Military Standard

    MIL-STD-129 Marking for Shipment and Storage (Military Agencies)

    UNSPSC Code

    UNSPSC Code 11101719(Zinc)

    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/B0086-09A

    Citation Format

    ASTM B86-09a, Standard Specification for Zinc and Zinc-Aluminum (ZA) Alloy Foundry and Die Castings, ASTM International, West Conshohocken, PA, 2009,

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