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 A449 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 A449 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 A449 Type 1 & Type 2 Bolts, Studs, etc with fine precision, superior integrity along with EN 10204 Type 3.1 Certification.
| Grade | Alloy |
| Type 1 | Medium Carbon Alloy Steel |
| Type 2 | Low Carbon Martensite or Medium Carbon Martensite Steel |
| Grade | Imperial (Inch) | Metric (mm) |
|---|---|---|
| Type 1 | 1/4" to 3" | M6 to M76 |
| Type 2 | 1/4" to 1" | M6 to M24 |
| 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 |
| 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 | -- | ||
| 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 | -- | ||
| 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 |
| 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 |
| 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 |