ASTM A 449

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.
ASTM A449 is virtually identical in chemistry and strength to ASTM A325 and SAE J429 grade 5. However, A449 is more flexible in the sense that it covers a larger diameter range and is not restricted by a specific configuration.

ASTM A449 Grades
Type 1 Plain carbon steel, carbon boron steel, alloy steel, or alloy boron steel.
Type 2 Withdrawn 2003
Type 3 Weathering steel.
ASTM 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%

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

-

-

ASTM A449 Mechanical properties

Size

Tensile, ksi

Yield, ksi

Elong. %, min

RA %, min

14- 1

120 min

92 min

14

35

118- 112

105 min

81 min

14

35

158- 3

90 min

58 min

14

35

ASTM A449 Marking

Grade

Marking Details

A449

Bolts are marked or stamped with “A449” along with RFL logo or as per customer need.