ASTM A449 covers headed bolts,
rods, and
anchor bolts 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.
| A449 Types |
| TYPE 1 |
Plain carbon steel, carbon boron steel, alloy steel, or alloy boron steel. |
| TYPE 2 |
Withdrawn 2003 |
| TYPE 3 |
Weathering steel. |
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| A449 Mechanical Properties |
| Size |
Tensile, ksi |
Yield, ksi |
Elong. %, min |
RA %, min |
| 1⁄4 - 1 |
120 min |
92 min |
14 |
35 |
| 11⁄8 - 11⁄2 |
105 min |
81 min |
14 |
35 |
| 15⁄8 - 3 |
90 min |
58 min |
14 |
35 |
| A449 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 |
0.60% |
0.60% |
0.60% |
0.60% |
| Phosphorus, max |
0.040% |
0.040% |
0.035% |
0.035% |
| Sulfur, max |
0.050% |
0.050% |
0.040% |
0.040% |
| 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% |
| Alloying Elements |
|
|
* |
* |
| * Steel, as defined by the American Iron and Steel Institute,
shall be considered to be alloy when the maximum range given for the content
of alloying elements exceeds one of more of the following limits: Manganese,
1.65%, silicon, 0.60%, copper, 0.60%, or in which a definite range or a minimum
quantity of any of the following elements is specified or required within the
limits of the recognized field of constructional alloy steels: aluminum, chromium
up to 3.99%, cobalt, columbium, molybdenum, nickel, titanium, tungsten, vanadium,
zirconium or any other alloying elements added to obtain a desired alloying effect. |
| 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 |
0.040% |
0.040% |
0.040% |
0.040% |
0.040% |
0.040% |
| 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 |
| A449 Recommended Hardware |
| 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 |
| Note: Nuts of other grades having proof
load stresses greater than the specified grade are suitable.
The ASTM A563 Nut Compatibility Chart has a complete list of specifications. |
