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Home / Resources / ASTM A449

ASTM A449

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Bolts, threaded rod, and anchors ranging from ¼” to 3”.

Scope – This specification covers bolts, threaded rod, and anchors in diameters ranging from 1/4″ through 3″ inclusive. It is a medium strength bolt manufactured from a medium carbon or alloy steel that develops its mechanical values through a heat treating process. It is intended for general engineering applications.

Grades

Type 1 Quenched and tempered carbon and alloy steels
Type 3 Quenched and tempered weathering steel

Mechanical Properties

Markings Size Tensile, ksi Yield, ksi Elong. % RA % Hardness
Type 1
A449
Type 3
A449
1/4 – 1 120 min 92 min 14 min 35 min C25-C34
1-1/8 – 1-1/2 105 min 81 min 14 min 35 min C19-C30
1-5/8 – 3 90 min 58 min 14 min 35 min

B183-B235

Chemical
Properties

Type 1 Bolts
Element Carbon Steel Carbon Boron Steel Alloy Steel Alloy Boron Steel
Carbon 0.30 – 0.52 0.30 – 0.52 0.30 – 0.52 0.30 – 0.52
Manganese, min 0.6 0.6 0.6 0.6
Phosphorus, max 0.04 0.04 0.035 0.035
Sulfur, max 0.05 0.05 0.04 0.04
Silicon 0.15-0.30 0.10 – 0.30 0.15 – 0.35 0.15 – 0.35
Boron 0.0005 – 0.003 0.0005 – 0.003
Type 3 Bolts, Class *
Element A B C D E F
Carbon 0.33 – 0.40 0.38 – 0.48 0.15 – 0.25 0.15 – 0.25 0.20 – 0.25 0.20 – 0.25
Manganese 0.90 – 1.20 0.70 – 0.90 0.80 – 1.35 0.40 – 1.20 0.60 – 1.00 0.90 – 1.20
Phosphorus 0.035 max 0.06 – 0.12 0.035 max 0.035 max 0.035 0.035
Sulfur, max 0.04 0.04 0.04 0.04 0.04 0.04
Silicon 0.15 – 0.35 0.30 – 0.50 0.15 – 0.35 0.25 – 0.50 0.15 – 0.35 0.15 – 0.35
Copper 0.25 – 0.45 0.20 – 0.40 0.20 – 0.50 0.30 – 0.50 0.30 – 0.60 0.20 – 0.40
Nickel 0.25 – 0.45 0.50 – 0.80 0.25 – 0.50 0.50 – 0.80 0.30 – 0.60 0.20 – 0.40
Chromium 0.45 – 0.65 0.50 – 0.75 0.30 – 0.50 0.50 – 1.00 0.60 – 0.90 0.45 – 0.65
Vanadium 0.020 min
Molybdenum 0.06 max 0.10 max
Titanium 0.05 max
* Selection of a class shall be at the option of the manufacturer

Recommended
Mating Materials

Nuts Washers
Plain Galvanized
1/4 – 1-1/2 1-5/8 – 3 1/4 – 3
A563B Hex A563A Heavy Hex A563DH Heavy Hex F436
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