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ASTM A449

A449 is very similar to A325 in checmistry and is used for standard bolts, high tensile bolts and high tensile fasteners, It's strength is in the middle of low and high and is manufacvtured from carbon steel or alloy steel raw material which can suffice its requirements as per A449.

Below we have mentioned the grades that fall under A449.

A449 Grades

Type 1 Plain Carbon Steel, Carbon Boron Steel, or alloy Boron steel
Type 2 Withdrawn 2003
Type 3 Weathering Steel

A449 Mechanical Requirements

Sizes Tensile ksi, min Yield ksi, min Elong %, min RA % min
1/4 to 1 120 92 14 35
1-1/8 to 1-1/2 105 81 14 35
1-5/8 to 3 90 58 14 35

A449 Chemical Properties for 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 0.60 min 0.60 min 0.60 min 0.60 min
Phosphorus, max 0.040 max 0.040 max 0.035 max 0.035 max
Sulfur, max 0.050 max 0.050 max 0.040 max 0.040 max
Silicon 0.15 – 0.30% 0.10 - 0.30% 0.15 – 0.35% 0.15 – 0.35%
Boron -
Alloying Elements - 0.06 max 0.10 min 0.10 min

A449 Chemical Properties for Type 3 Bolts

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, max 0.035 max 0.06 - 0.12% 0.035 max 0.035 max 0.035 max 0.035 max
Sulfur, max 0.040 max 0.040 max 0.040 max 0.040 max 0.040 max 0.040 max
Silicon 0.15 – 0.30% 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% 0.20 - 0.60% 0.20 - 0.60%
Nickel 0.25 - 0.45% 0.50 - 0.80% 0.25 - 0.50% 0.50 - 0.80% 0.20 min 0.20 min
Chromium 0.45 - 0.65% 0.50 - 0.80% 0.30 - 0.50% 0.50 - 1.00% 0.20 min 0.20 min
Vanadium - 0.20 min - - -
Molybdenum - 0.06 max 0.10% max
Titanium - 0.05% max

A449 Compatible Nuts & Washers

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