ASTM A307 Hex Bolts
ASTM A307 grade is used for Hex Bolt, stud bolts, Threaded Rods or any other bolt having a minimum tensile strength of 60 ksi.
An ASTM A307 Hex bolt is a low-tensile carbon steel Bolt, typically used for general-purpose, low-pressure applications in structures like bridges, docks, and buildings. ASTM A307 Comes in Grade A and Grade B denoting different strengths and configurations for specific uses.
Grade A: ASTM A307 Grade A Bolts are used in general applications with moderate tensile strength.
Grade B: ASTM A307 grade B bolts is a carbon steel bolts having higher-strength, commonly used for Flanged Joints in piping system & other heavy-duty applications.
Applications:
ASTM A307 bolts can be used for many different applications that include fastening wood, steel, and other construction materials for projects such as docks.
Infrastructure: Securing components in bridges, docks, highway structures, and utility poles.
Construction: Fastening materials in building projects and general construction.
Industrial: Used in equipment fabrication, machinery maintenance, and various industrial assembly lines.
- ASTM A703 Materials – Low Carbon Steel in ASTM A307 (Grades A and B)
- Sizes: Available in diameters from 1/4 inch through 4 inches.
Coatings: We Manufactures ASTM A307 hex bolts with hot-dip galvanized, Black Annealing, Geomet 500, Dacromet 500 Coating to provide protection against corrosion, especially for use in corrosive environments.
- Thread: METRIC
ASTM A307
ASTM A307 Bolts Mechanical Properties
Grade | Tensile strength – ksi | Elongation % min |
A | 60 min | 18 |
B | 60 – 100 | 18 |
Chemical Properties Of A307 Thru Bolt
Element | Grade A % max | Grade B % max |
Carbon | 0.29 | 0.29 |
Manganese | 1.20 | 1.20 |
Phosphorus | 0.04 | 0.04 |
Sulfur | 0.15 | 0.05 |
Astm A307 Bolt Equivalent Grade
| Diameter Range | Metric Grade | Approximate ASTM Equivalent grade | Description | Tensile, min | Yield, min | ||
|---|---|---|---|---|---|---|---|
| Mpa | ksi | Mpa | ksi | ||||
| All | 4.6 | A307A | Low or medium carbon steel | 400 | 58 | 240 | 35 |
| through 1″ (M24) | 5.8 | – | Cold worked low or medium carbon steel | 520 | 75 | 420 | 61 |
| through 1″ (M24) | 8.8 | A449 | Heat treated medium carbon steel | 830 | 120 | 660 | 96 |
| above 1″ (M24) | 8.8 | A193B7/A354BC or F1554G105 | Heat treated medium carbon steel | 830 | 120 | 660 | 96 |
| through 1-1/2″ (M36) | 8.8.3 | A325 Type 3 / A449 Type 3 | Heat treated medium carbon weathering steel | 830 | 120 | 660 | 96 |
| All | 10.9 | A490/A354BD | Heat treated medium carbon alloy steel | 1040 | 151 | 940 | 136 |
| through 1-1/2″ (M36) | 10.9.3 | A490 Type 3 | Heat treated medium carbon alloy weathering steel | 1040 | 151 | 940 | 136 |
| All | 12.9 | A574 | Heat treated alloy steel | 1220 | 177 | 1100 | 160 |
Recommended Nuts And Washers For A307 Anchor Bolt
Bolt | Nut | Washer |
Grade A – 1/4 inch to 11/2 inches | A563A Hex | F844 |
Grade A – 11/2 inches to 4 inches | A563A Heavy hex | F844 |
Grade B – 1/4 inch to 4 inches | A563A Heavy hex | F844 |
A307 Bolt Grade
| A | Headed bolts, threaded rods and bent bolts intended for general applications. |
|---|---|
| B | Heavy hex bolts and studs intended for flanged joints in piping systems with cast iron flanges. |
| C | Nonheaded anchor bolts, either bent or straight, intended for structural anchorage purposes. The end of a grade C anchor bolt intended to project from the concrete will be painted green for identification purposes. Permanent marking is a supplemental requirement. *As of August 2007, grade C has been replaced by specification F1554 grade 36. |