ASTM WK42185

    New Specification for Twist-Off Type Tension Control Structural Bolt/Nut/Washer Assemblies, Steel, Heat Treated, 200-ksi Minimum Tensile Strength

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    Developed by Subcommittee: F16.02 | Committee F16 | Contact Staff Manager


    1. Scope

    1.1 This specification covers one style of heat-treated, steel, tension control bolt-nut-washer assemblies, also referred to as sets, having a tensile strength of 200 to 215 ksi. These assemblies are capable of developing a minimum predetermined tension when installed by applying torque to the nut, while at the same time applying a counter torque to separate the spline end from the body of the bolt using an appropriate spline drive installation tool. 1.2 An assembly consists of a tension control bolt with spline end, nut, and washer covered by this specification. 1.3 The assemblies are available with round heads described in Section 11 in sizes 1 to 1 1/4 in. inclusive. 1.4 The fastener assemblies are intended for use in structural connections in the following environments conditions: 1.4.1 Interiors, normally dry, including interiors in which structural steel is imbedded in concrete, encased in masonry, or protected by membrane or noncorrosive contact-type fireproofing. 1.4.2 Interiors and exteriors, normally dry, under roof, in which the installed assemblies are protected by a shop-applied or field-applied coating to the structural steel system. 1.5 The fastener assemblies are not intended for use in structural connections in the following environments, with or without protection by a shop-applied or field-applied coating to the structural steel system: 1.5.1 Exteriors not under roof; 1.5.2 Chemical environments in which strong concentrations of highly corrosive gases, fumes, or chemicals, either in solution or as concentrated liquids or solids, contact the fasteners or their protective coating; 1.5.3 Heavy industrial environments severe enough to be classified as a chemical environment; 1.5.4 Condensation and high humidity environments maintaining almost continuous condensation, including submerged in water and soil; and 1.5.5 Cathodically protected environments in which current is applied to the structural steel system by the sacrificial anode method or the DC power method. 1.6 Units--The values stated in inch-pound units are to be regarded as the standard. No other units of measurement are included in this standard. 1.7 The following precautionary statement pertains only to the test method portions, Sections 15 and 16, 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.

    High-strength structural steel bolts of a strength higher than that of ASTM A325 and A490. To be used in structural steel buildings and similar engineering structures. For future adoption as a reference standard by American Institute of Steel Construction (AISC 360 and AISC 358), Canadian Standards Association (S16), and Research Council on Structural Connections (Specification for Structural Joints Using High Strength Bolts).


    alternate design fasteners; bolts; alloy steel; fasteners; spline end; structural; tension control bolt; tension control bolt assembly; twist-off bolt

    The title and scope are in draft form and are under development within this ASTM Committee.

    Citing ASTM Standards
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    Work Item Status

    Date Initiated:

    Technical Contact:
    Robert Shaw


    F16 (14-04)

    Ballot Item Approved