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Product Overview
ASTM A307 Grade B screws are carbon steel fasteners manufactured to meet the requirements of ASTM A307 for medium-strength, externally threaded fasteners. Grade B specifically covers heavy hex bolts, studs, and screws intended for use in cast iron flanged joints and high-pressure piping systems. These screws are produced from low-carbon steel and are designed for moderate tensile strength applications where high strength is not required but reliable performance and dimensional consistency are essential.
ASTM A307 Grade B screws are widely specified for flange bolting in refineries, waterworks, and general construction. They are supplied with full traceability and are available with hot-dip galvanized, zinc-plated, or plain finishes to suit various environmental conditions.
| Material | Carbon Steel |
| ASTM Grade | A307 Grade B |
| UNS Number | K02200 |
| DIN Number | 1.1151 |
| Material Standard | ASTM A307 |
| Screw Standard (Metric) | DIN 933 / ISO 4017 |
| Screw Standard (Inch) | ASME B18.2.1 |
| Thread Form | ISO Metric / UNC / UNF |
| Diameter Range | M6-M64 / ¼"-2½" |
| Tensile Strength | 414-586 MPa (60-85 ksi) |
| 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 |
| M56 | 5.5 | 85 | 35.0 | 120 | 1500 |
| M64 | 6.0 | 95 | 40.0 | 140 | 2000 |
| Standard | Covers | Thread |
|---|---|---|
| DIN 933 | Hex screws, full thread | Metric |
| ISO 4017 | Hex head screws, full | Metric |
| ASME B18.2.1 | Hex & heavy hex screws | UNC/UNF |
| ASME B1.1 | Unified Inch threads | UNC/UNF |
| BS 4190 | Metric hex screws | Metric |
| Material Standard | Requirement |
|---|---|
| ASTM A307 | Carbon steel screws |
| ASTM F568M | 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) | 0.60-1.65% |
| Phosphorus (P) | 0.04% max |
| Sulfur (S) | 0.15% max |
| Copper (Cu) | 0.60% max |
| Silicon (Si) | 0.10-0.35% |
| Iron (Fe) | Balance |
Fastener Performance
| Screw Size | Dry (Nm) | Lubricated (Nm) | Clamp Load (kN) |
|---|---|---|---|
| M12 | 60 | 48 | 22 |
| M16 | 150 | 120 | 45 |
| M20 | 290 | 232 | 72 |
| M24 | 500 | 400 | 105 |
| M30 | 980 | 784 | 170 |
| M36 | 1700 | 1360 | 245 |
| M42 | 2600 | 2080 | 340 |
| M48 | 3800 | 3040 | 460 |
Industry Applications
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