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 marking
|
Grade
|
Nominal size range [in]
|
Proof strength [ksi]
|
Yield strength (min) [ksi]
|
Tensile strength (min) [ksi]
|
Core hardness [Rockwell]
|
|
Grade BC
|
1⁄4–2-1⁄2 (inc.)
|
105
|
109
|
125
|
C26–36
|
|
2-1⁄2–4
|
95
|
99
|
115
|
C22–33
|
|
Grade BD
|
1⁄4–2-1⁄2 (inc.)
|
120
|
130
|
150
|
C33–39
|
|
2-1⁄2–4
|
105
|
115
|
140
|
C31–39
|
Recommended nuts
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 finish
|
Nut grade & style
|
|
BC; plain or a coating of insufficient thickness to require over-tapped nuts
|
C; heavy hex
|
|
BC; zinc-coated or a coating that requires over-tapped nuts
|
DH; heavy hex
|
|
BD; all finishes
|
DH; heavy hex
|
References
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^ a b c ASTM A354 - 07a, retrieved 2009-06-20 .
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^ ASTM A354, retrieved 2009-06-20 .
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^ FastenalTechnicalReferenceGuide, retrieved 2010-05-03 .
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