A449 type 1 Medium Carbon steel partial thread UN heavy hex bolt
STM A449 covers headed bolts, rods and anchor bolts in diameters ranging from 1/4″ through 3″ inclusive. It is a medium strength bolt manufactured from a medium carbon or alloy steel that develops its mechanical values through a heat treating process. It is intended for general engineering applications.
ASTM A449 is virtually identical in chemistry and strength to ASTM A325 and SAE J429 grade 5. However, A449 is more flexible in the sense that it covers a larger diameter range and is not restricted by a specific configuration
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 |
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A449 Type 1 Medium Carbon Steel Partial Thread UN Heavy Hex Bolts 42CrMo Images
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