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ASTM A449 is a material regulation covering hex headed bolts, rods, and anchor bolts. They are typically general use fasteners used in standard engineering applications. Diameters for ASTM A449 heads range from 1/4” through 3” in a quenched or tempered steel finish.

The reason ASTM A449 bolts are labeled for general engineering practices is because they are considered a medium strength fastener. The product itself is manufactured from a medium carbon or alloy steel with its strength properties and mechanical values being obtained from a heat-treating process.

In terms of similarity ASTM A449 is virtually identical to ASTM A325 and SAE J429 grade 5 in regards to chemistry and strength. The reason ASTM A449 is often times a more viable solution is because it is more flexible for larger diameters and isn't confined by specific configurations.

Like many of the ASTM regulations A449 has different types within itself. Type 1, Type 2, and Type 3 A449 are designated by unique markings on the head and in this instance refer to different materials used in each. Specifically the callouts designate:

  • Type 1 - Plain carbon steel, alloy steel, carbon boron steel, or alloy boron steel.
  • Type 2 – Withdrawn in 2003
  • Type 3 – Weathering steel

A449 also features different mechanical properties based not on the type or class of the fastener but the size. The specified ordinances based on the standards include:

  • 1/4” to 1” - 120 ksi minimum tensile strength, 92 ksi minimum yield strength, 14% minimum elongation, 35% minimum reduction in area.
  • 1-1/8” to 1-1/2” - 105 ksi min tensile strength, 81 ksi min yield strength, 14% min EL, 35% min RA.
  • 1-5/8” to 3” - 90 ksi min tensile strength, 58 ksi min yield strength, 14% min EL, 35% min RA.

Glaser is a trusted distributor of both general engineering fasteners and products designed for more heavy-duty operations. Please contact us for more information about your specific needs.


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