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ASTM A354 covers the chemical and mechanical requirements of quenched and tempered alloy steel bolts, studs, and other externally threaded fasteners 4″ and under in diameter. There are two strength levels BC and BD. This specification can be a headed bolt, bent bolt, or threaded rod.

A354 Grades

BD Grade BD bolts are higher in strength than grade BC, and equal in strength to ASTM F3125 grade A490 bolts, but A490 is not unrestricted in its configuration. A490 bolts are for structural use and do not exceed 1-1/2″ in diameter, A354 grade BD should be used for anchor bolts, threaded rods, other styles of headed bolts, and bolts larger than 1-1/2″ diameter where similar mechanical properties are desired. A354 grade BD does not require a magnetic particle test like A490, unless called out as a supplemental requirement.
BC Lower in strength than BD. Should be considered instead of F3125 grade A325 bolts when configuration and size conflicts occur with A325.

A354 Mechanical Properties

Grade Size Tensile, ksi, min Yield, ksi, min Elong %, min RA %, min Hardness, HRC
BC 1/4 - 2-1/2 125 min 109 16 50 26 - 36
Over 2-1/2 115 min 99 16 45 22 - 33
BD All Sizes 150 - 173 130 14 40 33 - 38

A354 Chemical Properties

Element All sizes of Grade BC, Grade BD through 2-1/4″ diameter. Grade BD over 2-1/4″
Carbon, % 0.30 to 0.53 0.35 to 0.53
Manganese, % min 0.60 0.60
Phosphorus, % max 0.035 0.035
Sulfur, % max 0.040 0.040
Boron, % max 0.003 0.003
Nickel, % min 0.40
Chromium, % min 0.40
Molybdenum, % min 0.15
Other Alloying Elements * *
*steel is considered to be alloy when the maximum range given for manganese exceeds 1.65 % or a definite minimum quantity for any of the following elements is specified or required within the limits of the recognized field of constructional alloy steels: chromium, molybdenum, nickel, or any other alloying element added to obtain a desired alloying effect.

Additional Requirements, Grade BD, Diameters above 2-1/4″

Charpy Impact 20ft-lbs minimum @ -4F
Cross Sectional Hardness Equidistant hardness readings shall be taken across the diameter of the fastener through the threaded section. Reading shall be no further apart than 1/4″. No reading shall be outside the acceptable range given above, and no reading shall be greater than +/- 3 HRC points from the average mid-radius hardness value.

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