ASTM International

Standard Specification for High Strength Structural Bolt Assemblies, Steel and Alloy Steel, Heat Treated, 144ksi Minimum Tensile Strength, Inch Dimensions
 N F3148

Annotation

This specification covers chemical, dimensional, physical and mechanical requirements for quenched and tempered bolts manufactured from steel and alloy steel, in inch dimensions. The bolts are available as structural bolting assemblies which include a fixed spline bolt, a suitable nut and at least one washer covered by reference herein.

Classification:

Structural bolting assemblies are designated as Grade 144.

Bolts are designated by type denoting raw material chemical composition.

Type 1 - 144ksi - carbon steel, carbon boron steel, alloy steel or alloy steel with boron addition

Type 3 - 144ksi - weathering steel

Terms used in the specification are defined in Terminology F1789.

Torque-and-Angle Fixed-Spline Structural Bolt—bolt that includes an integral fixed-spline end which extends beyond the threaded portion of the bolt and is used as a component of a torque-and-angle fixed-spline structural bolting assembly.

Torque-and-Angle Fixed-Spline Structural Bolting Assembly2— a fastener assembly comprised of a torque-andangle fixed-spline bolt with a suitable nut and at least one washer, installed and tightened using a special electric wrench and socket system which has an inner socket that engages the fixed-spline end of the bolt and with an outer socket that engages and turns the nut, in two separate and distinct operations, the first is a controlled torque application and the second is a specified angle.