ASTM A354 Grade BC ASTM A354 Grade BDThe ASTM A354 specification covers the chemical and mechanical requirements of quenched and tempered alloy steel bolts, studs, and other externally threaded fasteners 4″ and under in diameter.

Two strength levels, grade BC and grade BD, are summarized in the chart below. This specification is unrestricted in its configuration and can be a headed boltbent bolt, or threaded rod.

A354 Grades

A354 BD A354 grade BD bolts are higher in strength than A354 grade BC and equal in strength to ASTM A490 bolts. Unlike ASTM A490 however, the A354 BD specification is unrestricted in its configuration. Since A490 bolts are heavy hex structural bolts and do not exceed 1-1/2" diameter, specification A354 BD should be considered 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 as is required by the A490 specification.

Research conducted on bolts of similar material and manufacture indicates that hydrogen-stress cracking or stress cracking corrosion may occur on hot-dip galvanized Grade BD bolts.  For more information about this subject, please see our FAQ that addresses galvanizing of high strength bolts.
A354 BC Lower in strength than grade BD.

A354 Mechanical Properties

Grade Size Tensile, ksi, min Yield, ksi, min Elong %, min RA %, min
BC 1/4 - 2-1/2 125 109 16 50
2-5/8 - 4 115 99 16 45
BD 1/4 - 2-1/2 150 130 14 40
2-5/8 - 4 140 115 14 40

A354 Chemical Properties

Element Sizes 1/4 to 1-1/2 Sizes above 1-1/2
Carbon 0.30 - 0.53% 0.35 - 0.53%
Phosphorus, max 0.035% 0.035%
Sulfur, max 0.040% 0.05%

A354 Recommended Hardware

Nuts Washers
Grade BC Grade BD
Plain Galvanized Plain
A563C Heavy Hex A563DH Heavy Hex A563DH Heavy Hex F436
* Nuts of other grades load stresses greater than the specified grade are suitable.  Follow the link for an ASTM A563 Nut Compatibility Chart.