Shanghai Powermax Fastener Co., Ltd.
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ASTM A449 structural UNC 2A fully thread black finish heavy hex bolt
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. We 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.
SIZE: 1/4" - 1.1//2", M6 -M36. And 600mm Max length.
STANDARD: ASME B18.2.6
THREAD: ASME B1.1 , UNC, UNF, CLASS 2A
FINISHED: Plain, Zinc Plated(Clear/Blue/Yellow/Black), Black oxide, Nickel, Dacromet, H.D.G.
| ASTM A449 Bolt Grades | |
| Bolt Grade | Alloy |
| Type 1 | Medium Carbon Alloy Steel |
| Type 2 | Low Carbon Martensite or Medium Carbon Martensite Steel |
| ASTM A449 Bolting Size Range | |
| Bolt Grade | Inch |
| Type 1 | 1/4" to 3" |
| Type 2 | 1/4" to 1" |
| ASTM A449 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 | 0.6 | 0.57 | 0.6 | 0.67 |
| Phosphorus, max | 0.04 | 0.048 | 0.04 | 0.048 |
| Sulfur, max | 0.05 | 0.058 | 0.05 | 0.058 |
| Boron, min | -- | -- | 0.0005 | 0.0005 |
| ASTM A449 Mechanical Properties | ||||
| 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 |
| ASTM A449 Hardness Requirements | ||
| 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 | -- |
| ASTM A449 Recommended Nuts | |||
| Bolt Grade | Size, Finish | Nut Grade | Style |
| Type 1 & Type 2 | 1/4" to 1-1/2", plain | ASTM A563 Grade B | Hex |
| Over 1-1/2" to 3", plain | ASTM A563 Grade A | Heavy Hex | |
| 1/4" to 3", zinc coated | ASTM A563 Grade DH | Heavy Hex | |