ASTM F2280

This specification covers two types of heat treated, steel, tension control bolt-nut-washer assemblies, also referred to as "sets," having a tensile strength of 150 to 173 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. The tension control bolts are designated by type denoting chemical composition as follows: type 1 - alloy steel, and type 3 - weathering steel. The chemical composition of the tension control bolts, nuts, and washers shall conform to the requirements specified. The assembly lot tension test shall be performed on fastener assemblies to determine the ability of the assembly to provide the required minimum tension. Tensile strength, proof load, hardness, and carburization/decarburization shall be tested to meet the requirements prescribed.

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 two types of heat treated, steel, tension control bolt-nut-washer assemblies, also referred to as “sets,” having a tensile strength of 150 to 173 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 (covered by this specification) and a suitable nut and washer covered by reference to applicable ASTM specifications.

1.3 The fastener assemblies are intended for use in structural connections. These connections, installation procedures, and the use of alternate design structural bolts are covered under the requirements of the “Specification for Structural Joints Using ASTM A 325 or A 490 Bolts”, approved by the Research Council on Structural Connections.

1.4 The assemblies are available with either round (button or dome) heads, heavy hex structural heads, or alternate design heads described in Section 11 , in sizes ½ to 1 ¹/₈ in. inclusive, in two types specified in Section 4.

1.5 Tension control bolts manufactured and marked in accordance with the requirements of Specification A 490, and conforming to the dimensional and other requirements of this specification, will be considered an acceptable alternate under this specification for two years following initial publication.

1.6 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.

2. Referenced Documents

A490 Specification for Structural Bolts, Alloy Steel, Heat Treated, 150 ksi Minimum Tensile Strength
A563 Specification for Carbons and Alloy Steel Nuts
A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
E1444 Practice for Magnetic Particle Testing
E709 Guide for Magnetic Particle Testing
F1470 Guide for Fastener Sampling for Specified Mechanical Properties and Performance Inspection
F1789 Terminology for F16 Mechanical Fasteners
F2328 Test Method for Determining Decarburization and Carburization in Hardened and Tempered Threaded Steel Bolts, Screws and Studs
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
F788/F788M Specification for Surface Discontinuities of Bolts, Screws, and Studs, Inch and Metric Series
G101 Guide for Estimating the Atmospheric Corrosion Resistance of Low-Alloy Steels
Specification for Structural Joints Using ASTM A325 or A490 Bolts
B1.1 Unified Inch Screw Threads
B1.3M Screw Threads Gaging Systems for Dimensional Acceptability-Inch and Metric Screw Threads
B18.2.6 Fasteners for Use in Structural Applications

Index Terms

alternate design fasteners; bolts; alloy steel; fasteners; spline end; structural; tension control bolt; tension control bolt assembly; twist-off bolt; weathering steel; Bolt/nut/washer assembly ; ICS Number Code 21.060.01; ICS Number Code 21.060.01

Citing ASTM Standards

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