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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.

A449 Types

TYPE 1Plain carbon steel, carbon boron steel, alloy steel, or alloy boron steel.
TYPE 2Withdrawn 2003
TYPE 3Weathering steel.

A449 Mechanical Properties

Size Tensile, ksi Yield, ksi Elong. %, min RA %, min
1/4 - 1120 min92 min1435
1-1/8 - 1-1/2105 min81 min1435
1-5/8 - 390 min58 min1435

A449 Chemical Properties

Type 1 Bolts
Element Carbon Steel Carbon Boron Steel Alloy Steel Alloy Boron Steel
Carbon0.30 - 0.52%0.30 - 0.52%0.30 - 0.52%0.30 - 0.52%
Manganese, min0.60%0.60%0.60%0.60%
Phosphorus, max0.040%0.040%0.035%0.035%
Sulfur, max0.050%0.050%0.040%0.040%
Silicon0.15-0.30%0.10 - 0.30%0.15 - 0.35%0.15 - 0.35%
Boron0.0005 - 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
Carbon0.33 - 0.40%0.38 - 0.48%0.15 - 0.25%0.15 - 0.25%0.20 - 0.25%0.20 - 0.25%
Manganese0.90 - 1.20%0.70 - 0.90%0.80 - 1.35%0.40 - 1.20%0.60 - 1.00%0.90 - 1.20%
Phosphorus0.035% max0.06 - 0.12%0.035% max0.035% max0.035%0.035%
Sulfur, max0.040%0.040%0.040%0.040%0.040%0.040%
Silicon0.15 - 0.35%0.30 - 0.50%0.15 - 0.35%0.25 - 0.50%0.15 - 0.35%0.15 - 0.35%
Copper0.25 - 0.45%0.20 - 0.40%0.20 - 0.50%0.30 - 0.50%0.30 - 0.60%0.20 - 0.40%
Nickel0.25 - 0.45%0.50 - 0.80%0.25 - 0.50%0.50 - 0.80%0.30 - 0.60%0.20 - 0.40%
Chromium0.45 - 0.65%0.50 - 0.75%0.30 - 0.50%0.50 - 1.00%0.60 - 0.90%0.45 - 0.65%
Vanadium0.020% min
Molybdenum0.06% max0.10% max
Titanium0.05% 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 HexA563A Heavy HexA563DH Heavy HexF436
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.


ASTM Specifications for Bolt Fasteners

 - Alloy steel and stainless steel bolting materials for high temperature or high pressure service.
  •  - Carbon steel bolts and studs, 60,000 psi tensile strength.
  •  - Alloy steel and stainless steel bolting materials for low temperature service.
  •  - Structural bolts, steel, heat treated, 120/105 ksi minimum tensile strength.
  •  - Quenched and tempered alloy bolts, studs, and other externally threaded fasteners.
  •  - Quenched and tempered steel bolts and studs for general use.
  •  - High temperature Bolting with expansion co-efficient comparable to Austenitic Stainless Steel
  •  - Structural bolts, alloy steel, heat treated, 150 ksi minimum tensile strength.
 - Standard for metric bolts, screws and studs that are used in general engineering applications
  •  - Stainless steel bolts, hex cap screws, and studs.
  •  - Anchor bolts designed to anchor structural supports to concrete foundations.

ASTM Specifications for Nuts

ASTM Specifications for Washers

- Specification for Hardened Steel Washers , carbon steel, steel, washers, weathering steel, Hardened steel washers
  • - Standard Specification for Washers, Steel, Plain (Flat), Unhardened for General Use
  • - Standard Specification for Compressible-Washer-Type Direct Tension Indicators for Use with Structural Fasteners


Astm A449 studs bolts Application Industries

Sunflex Metal Industries are engaged in manufacturing of robust quality of Astm A449 studs bolts. These Astm A449 studs bolts are widely used in the following industries:

Astm A449 studs bolts Mining Industries
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