ASTM F959 - 13

    Standard Specification for Compressible-Washer-Type Direct Tension Indicators for Use with Structural Fasteners

    Active Standard ASTM F959 | Developed by Subcommittee: F16.02

    Book of Standards Volume: 01.08


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    Abstract

    This specification covers the requirements for four types (Types 325, 325-3, 490, and 490-3) of compressible-washer-type direct tension indicators, in nominal diameter sizes ½ through 1 ½ in., capable of indicating the achievement of a specified minimum bolt tension in a structural bolt and are intended for installation under either a bolt head or a hardened washer. Steel materials used in the manufacture of direct tension indicators shall be designed, processed, and protectively coated as specified. The direct tension indicators shall conform to required chemical composition, compression load, and dimensional values.

    This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

    1. Scope

    1.1 This specification covers the requirements for compressible-washer-type direct tension indicators capable of indicating the achievement of a specified minimum bolt tension in a structural bolt.

    1.2 Four types of direct tension indicators in nominal diameter sizes 1/2 through 11/2 in. are covered:

    1.2.1 Type 325—direct tension indicators for use with Specification A325 Type 1 bolts or F  or F1852 assemblies.

    1.2.2 Type 325–3—direct tension indicators for use with Specification A325 Type 3 or F1852 Type 3 assemblies.

    1.2.3 Type 490—direct tension indicators for use with Specification A490 Type 1 bolts or F2280 assemblies.

    1.2.4 Type 490–3—direct tension indicators for use with Specification A490 Type 3 F2280 Type 3 assemblies.

    1.3 Direct tension indicators are intended for installation under either a bolt head or a hardened washer. (See Research Council on Structural Connections: Specification for Structural Joints Using ASTM A325 or A490 Bolts.)

    1.4 This specification provides for furnishing Types 325–3 and 490–3 to a Chemical Composition Requirement or a Corrosion Resistance Index (CRI) at the suppliers option.

    1.5 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard.

    1.6 The following precautionary statement pertains only to the test method portions, Section 12 and Appendix X1 of this specification: 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 and health practices and determine the applicability of regulatory limitations prior to use.


    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

    A325 Specification for Structural Bolts, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength

    A490 Specification for Structural Bolts, Alloy Steel, Heat Treated, 150 ksi Minimum Tensile Strength

    B695 Specification for Coatings of Zinc Mechanically Deposited on Iron and Steel

    D3951 Practice for Commercial Packaging

    F436 Specification for Hardened Steel Washers

    F606 Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, Direct Tension Indicators, and Rivets

    F1470 Practice for Fastener Sampling for Specified Mechanical Properties and Performance Inspection

    F1852 Specification for Twist Off Type Tension Control Structural Bolt/Nut/Washer Assemblies, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength

    F2280 Specification for Twist Off Type Tension Control Structural Bolt/Nut/Washer Assemblies, Steel, Heat Treated, 150 ksi Minimum Tensile Strength

    G101 Guide for Estimating the Atmospheric Corrosion Resistance of Low-Alloy Steels

    ASME Standard

    ASME B18.2.6 Fasteners for Use in Structural Applications


    ICS Code

    ICS Number Code 21.060.01 (Fasteners in general)

    UNSPSC Code

    UNSPSC Code 31160000(Hardware)


    Referencing This Standard

    DOI: 10.1520/F0959-13

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM F959-13, Standard Specification for Compressible-Washer-Type Direct Tension Indicators for Use with Structural Fasteners, ASTM International, West Conshohocken, PA, 2013, www.astm.org

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