Full Description

1.1This specification covers two types of heat treated, steel, tension control bolt-nut-washer assemblies, also referred to as sets. 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.

1.2An 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.

1.3The 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 A325 or A490 Bolts, approved by the Research Council on Structural Connection.

1.4The assemblies are available with either round (button or dome) heads, heavy hex structural heads, or alternate design heads described in Section 10 and Fig. 1, in sizes ¹/₂to 1 ¹/₈in. inclusive, in two types specified in Section 4.

FIG. 1Head and Spline Dimensions Inches

Note 1:ANSI/ASME Subcommittee B18.2.1 is currently preparing an American Standard to cover dimensional requirements for this product. Upon publication, these dimensions will be replaced with a reference to the American Standard for the dimensional requirements.

1.5Terms used in this specification are defined in Terminology F1789 unless otherwise defined herein.

1.6The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard.

1.7The following precautionary statement pertains only to the test method portions, Sections 13 and 14, 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.