ASTM A449 Type 2 is a grade specification for high tensile low carbon martensite steel bolting material. Bolting Specialist offers Hex Bolts, Heavy Hex Bolts, Stud Bolts, Threaded Rods in A449 Type 2 specification. These A449 Type 2 Bolts are manufactured from 1/4" through 1" in imperial. ASTM A449 Type 2 Bolts can be provided with metallic zinc, hot dipped galvanizing, cadmium coatings. Bolting Specialist can supply these bolts with EN 10204 type 3.1 certification.
ASTM A449 Type 2 Bolting Size Range
| Grade |
Imperial (Inch) |
| Type 2 |
1/4" to 1" |
ASTM A449 Type 2 Chemical Composition
| Element |
Type 2 |
| Heat Analysis, % |
Product Analysis, % |
| Carbon |
0.15 - 0.38 |
0.13 - 0.41 |
| Manganese, min |
0.60 |
0.67 |
| Phosphorus, max |
0.040 |
0.048 |
| Sulfur, max |
0.050 |
0.058 |
| Boron, min |
0.0005 |
0.0005 |
Hardness Requirements for ASTM A449 Type 2 Bolts (Imperial)
| Bolt Size, inch |
Hardness |
Brinell Hardness Number |
Rockwell C |
| 1/4 to 1, incl. |
255 to 321 |
25 to 34 |
| Over 1 to 1-1/2, incl. |
223 to 285 |
19 to 30 |
| Over 1-1/2" to 3, incl. |
183 to 235 |
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ASTM A449 Type 2 Mechanical Requirement (Imperial)
| Nominal Diameter, inch |
Tensile Strength, ksi |
Yield Strength, min, ksi |
Elongation in 4D, min, % |
Reduction in Area, min, % |
| 1/4 to 1, incl. |
120 |
92 |
14 |
35 |
| Over 1 to 1-1/2, incl. |
105 |
81 |
14 |
35 |
| Over 1-1/2 to 3, incl. |
90 |
58 |
14 |
35 |
Recommended Nuts
| Bolt Type and Surface Finish |
Nut Grade and Style |
| 1/4" to 1-1/2", plain (or with a coating of insufficient thickness to require over tapped nut) |
B, Hex |
| Over 1-1/2" to 3", plain (or with a coating of insufficient thickness to require over tapped nut) |
A, Heavy Hex |
| 1/4" to 3", zinc coated (or with a coating thickness requiring over tapped nut) |
DH, Heavy Hex |