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Product Overview
ASTM A307 Grade A bolts are low carbon steel fasteners manufactured to the ASTM A307 specification, designed for general-purpose, non-critical applications. These bolts are produced from carbon steel with a maximum tensile strength of 60 ksi (414 MPa) and are commonly supplied in plain, zinc-plated, or hot-dip galvanized finishes. ASTM A307 Grade A bolts are widely used for structural, construction, and light-duty industrial connections where high strength is not required.
They are available in a variety of head styles, including hex head, square head, and carriage bolts, and are suitable for use with nuts and washers in both metric and inch sizes. ASTM A307 Grade A bolts are the industry standard for anchor bolts, flange bolts, and general construction fasteners.
| Material | Low Carbon Steel |
| UNS Number | K02200 |
| DIN Number | 1.1151 |
| Material Standard | ASTM A307 |
| Bolt Standard (Metric) | DIN 931 / DIN 933 / ISO 4014 |
| Bolt Standard (Inch) | ASME B18.2.1 |
| Thread Form | ISO Metric / UNC / UNF |
| Diameter Range | M6-M48 / ¼"-2" |
| Tensile Strength | 414 MPa (60 ksi) max |
| Yield Strength | 207 MPa (30 ksi) min |
| Hardness | Max 100 HB |
Complete the Fastener Set
Technical Data
| Size (M) | Pitch (mm) | A/F (mm) | Head Ht (mm) | Min L (mm) | Max L (mm) |
|---|---|---|---|---|---|
| M6 | 1.0 | 10 | 4.0 | 10 | 200 |
| M8 | 1.25 | 13 | 5.3 | 12 | 250 |
| M10 | 1.5 | 17 | 6.4 | 16 | 300 |
| M12 | 1.75 | 19 | 7.5 | 20 | 400 |
| M16 | 2.0 | 24 | 10.0 | 25 | 500 |
| M20 | 2.5 | 30 | 12.5 | 30 | 600 |
| M24 | 3.0 | 36 | 15.0 | 40 | 600 |
| M30 | 3.5 | 46 | 18.7 | 50 | 800 |
| M36 | 4.0 | 55 | 22.5 | 60 | 1000 |
| M42 | 4.5 | 65 | 26.0 | 80 | 1000 |
| M48 | 5.0 | 75 | 30.0 | 100 | 1200 |
| Standard | Covers | Thread |
|---|---|---|
| DIN 931 | Hex bolts, partial thread | Metric |
| DIN 933 | Hex bolts, full thread | Metric |
| ISO 4014 | Hex head screws, partial | Metric |
| ISO 4017 | Hex head screws, full | Metric |
| ASME B18.2.1 | Hex & heavy hex bolts | UNC/UNF |
| ASTM A307 | Carbon steel bolts | UNC/UNF |
| ASME B18.5 | Round & square head bolts | UNC/UNF |
| Material Standard | Requirement |
|---|---|
| ASTM A307 | Low carbon steel bolts |
| ASTM F568M | Metric mechanical properties |
| EN 10204 3.1 | Mill test certificate |
| EN 10204 3.2 | TPI-witnessed MTC |
Material Chemistry
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.27% max |
| Manganese (Mn) | 0.60-0.90% |
| Phosphorus (P) | 0.04% max |
| Sulfur (S) | 0.15% max |
| Iron (Fe) | Balance |
Fastener Performance
| Bolt Size | Dry (Nm) | Lubricated (Nm) | Clamp Load (kN) |
|---|---|---|---|
| M12 | 55 | 44 | 18 |
| M16 | 135 | 108 | 32 |
| M20 | 265 | 212 | 50 |
| M24 | 460 | 368 | 72 |
| M30 | 900 | 720 | 116 |
| M36 | 1600 | 1280 | 168 |
| M42 | 2500 | 2000 | 236 |
| M48 | 3700 | 2960 | 324 |
Industry Applications
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