ASTM A354 is an ASTM International standard that defines chemical and mechanical properties for alloy steel bolts, screws, studs, and other externally threaded fasteners. It is officially titled: Standard Specification for Quenched and Tempered Alloy Steel Bolts, Studs, and Other Externally Threaded Fasteners.[1]

This is a standard set by the standards organization ASTM International, a voluntary standards development organizations that sets technical standards for materials, products, systems, and services.

Mechanical properties

This standard defines the properties for fasteners up to 4 inches in diameter. They are not to be used in applications where they are tensioned to more than 50% of their tensile strength. In those applications structural heavy hex bolts are to be used, as defined by ASTM A490, even though they have the same strength.[1][2]

Head markings and mechanical properties[3]
Head markingGradeNominal size range [in]Proof strength [ksi]Yield strength (min) [ksi]Tensile strength (min) [ksi]Core hardness [Rockwell]
Grade BC
14–2-12 (inc.)105109125C26–36

Grade BD14–2-12 (inc.)120130150C33–39

The standard also specifies what nuts are recommended for use with the defined fasteners. Note that nuts of a greater strength can also be used.[1]

Fastener grade & surface finishNut grade & style
BC; plain or a coating of insufficient thickness to require over-tapped nutsC; heavy hex
BC; zinc-coated or a coating that requires over-tapped nutsDH; heavy hex
BD; all finishesDH; heavy hex


  1. ASTM A354 - 07a, retrieved 2009-06-20.
  2. "ASTM A354". Portland Bolt. Retrieved 2009-06-20..
  3. FastenalTechnicalReferenceGuide (PDF), retrieved 2010-05-03.
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