ASTM A449M - Standard Specification for Quenched and Temperature Steel Bolts and Studs
This specification covers chemical and mechanical requirements for two types of quenched and tempered steel bolts and studs, intended for use in general application with high strength requirement. ASTM A449M specification includes type 1 medium carbon steel bolts and studs manufactured in diameter 1/4 inch to 3 inch for imperial connections and from M6 to M76 for metric connections; Whereas A449M type 2 is low carbon martensite steel bolts and studs manufactured in diameter 1/4 inch to 1 inch for imperial connections and M6 to M24 for metric connections. Ferrobend manufactures and supplies ASTM A449M Type 1 & Type 2 Bolts, Studs, etc with fine precision, superior integrity along with EN 10204 Type 3.1 Certification.
ASTM A449M Grades
| Grade |
Alloy |
| Type 1 |
Medium Carbon Alloy Steel |
| Type 2 |
Low Carbon Martensite or Medium Carbon Martensite Steel |
ASTM A449M Bolting Size Range
| Grade |
Metric (mm) |
| Type 1 |
M6 to M76 |
| Type 2 |
M6 to M24 |
ASTM A449M Chemical Composition
| Element |
Type 1 |
Type 2 |
| Heat Analysis, % |
Product Analysis, % |
Heat Analysis, % |
Product Analysis, % |
| Carbon |
0.28 - 0.55 |
0.25 - 0.58 |
0.15 - 0.38 |
0.13 - 0.41 |
| Manganese, min |
0.60 |
0.57 |
0.60 |
0.67 |
| Phosphorus, max |
0.040 |
0.048 |
0.040 |
0.048 |
| Sulfur, max |
0.050 |
0.058 |
0.050 |
0.058 |
| Boron, min |
-- |
-- |
0.0005 |
0.0005 |
ASTM A449M Mechanical Requirement
| Nominal Diameter, inch |
Tensile Strength, ksi |
Yield Strength, min, ksi |
Elongation in 4D, min, % |
Reduction in Area, min, % |
| M6 to M24, incl. |
825 |
635 |
14 |
35 |
| Over M24 to M38, incl. |
725 |
560 |
14 |
35 |
| Over M38 to M76, incl. |
620 |
400 |
14 |
35 |
Hardness Requirements for ASTM A449MM Bolts
| Bolt Size, inch |
Hardness |
| Brinell Hardness Number |
Rockwell C |
| M4 to M24, incl.
| 255 to 321 |
25 to 34 |
| Over M24 to M38, incl.
| 223 to 285 |
19 to 30 |
| Over M38 to M76, incl.
| 183 to 235 |
-- |
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 |