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    ASTM E1685 - 20

    Standard Practice for Measuring the Change in Length of Bolts Using the Ultrasonic Pulse-Echo Technique

    Active Standard ASTM E1685 | Developed by Subcommittee: E28.13

    Book of Standards Volume: 03.01


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    Significance and Use

    5.1 The techniques described provide for the measurement of change in length of a fastener. Such measurements are made from one end of the specimen without requiring access to the rear surface.

    5.2 The Ultrasonic Pulse Echo technique is used to monitor changes in length of fasteners and as a tool for industrial quality control. Applications include fasteners used in turbines, petrochemical pressure vessels, aircraft, automotive manufacturing, general bolting within the nuclear industry, structural steel connections, and laboratory testing.

    1. Scope

    1.1 This practice covers a procedure for measuring changes in length of threaded bolts using the ultrasonic pulse-echo technique.

    1.2 This procedure is normally intended for metal bolting 6.3 mm or more in nominal diameter with effective length-to-diameter ratios of 2:1 or greater.

    1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

    1.4 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.

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

    ASTM Standards

    E6 Terminology Relating to Methods of Mechanical Testing

    E111 Test Method for Youngs Modulus, Tangent Modulus, and Chord Modulus

    E1316 Terminology for Nondestructive Examinations

    E1544 Practice for Construction of a Stepped Block and Its Use to Estimate Errors Produced by Speed-of-Sound Measurement Systems for Use on Solids


    ICS Code

    ICS Number Code 17.040.30 (Measuring instruments); 21.060.01 (Fasteners in general)

    UNSPSC Code

    UNSPSC Code


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

    DOI: 10.1520/E1685-20

    Citation Format

    ASTM E1685-20, Standard Practice for Measuring the Change in Length of Bolts Using the Ultrasonic Pulse-Echo Technique, ASTM International, West Conshohocken, PA, 2020, www.astm.org

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