The 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.
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.|
|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|
|Element||Sizes 1/4 to 1-1/2||Sizes above 1-1/2|
|Carbon||0.30 - 0.53%||0.35 - 0.53%|