ASTM A729/A729M-09

    Standard Specification for Alloy Steel Axles, Heat-Treated, for Mass Transit and Electric Railway Service

    SUPERSEDED (see Active link, below)


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    1. Scope

    1.1 This specification covers heat-treated alloy steel axles for mass transit and commuter cars in electric and locomotive hauled railway service.

    1.2 This specification is for solid design roller bearing axles with machined bodies.

    1.3 Various axle designs are used for this service including motor and non-motor with either inboard or outboard journals.

    1.4 Supplementary requirements including those in the general requirements of Specification A 788/A 788M are provided for use when additional testing or inspection is desired. These shall apply only when specified individually by the purchaser in the order.

    1.5 Unless the order specifies the applicable M specification designation, the axles shall be furnished to the inch-pound units.

    1.6 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.


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

    Other Standards

    AARManualofStandards Wheels and Axles Available from the Association of American Railroads, http://www.aarpublications.com/.

    ASTM Standards

    A29/A29M Specification for Steel Bars, Carbon and Alloy, Hot-Wrought, General Requirements for

    A275/A275M Practice for Magnetic Particle Examination of Steel Forgings

    A388/A388M Practice for Ultrasonic Examination of Steel Forgings

    A788/A788M Specification for Steel Forgings, General Requirements

    E112 Test Methods for Determining Average Grain Size

    E381 Method of Macroetch Testing Steel Bars, Billets, Blooms, and Forgings

    E1426 Test Method for Determining the Effective Elastic Parameter for X-Ray Diffraction Measurements of Residual Stress


    ICS Code

    ICS Number Code 45.040 (Materials and components for railway engineering)

    UNSPSC Code

    UNSPSC Code 25173800(Drivetrain systems); 25173801(Driving axles)


    DOI: 10.1520/A0729_A0729M-09

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