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Product Overview
ASTM A193 Grade B7 studs are high-strength alloy steel threaded rods manufactured from quenched and tempered chromium-molybdenum steel, typically conforming to AISI 4140/4142. Designed for bolting pressure vessels, valves, flanges, and fittings in high-temperature and high-pressure service, B7 studs deliver a minimum tensile strength of 860 MPa (125 ksi) and are the industry standard for petrochemical and power generation bolted joints.
These studs are supplied with rolled or cut threads in both metric and inch series, and are available as double-end, tap-end, and continuous-threaded rods. Each batch is heat-treated and tested per ASTM A193, with full traceability and certification to EN 10204 3.1 or 3.2 as required for critical applications.
| Material | Alloy Steel (AISI 4140/4142) |
| UNS Number | K11597 |
| DIN Number | 1.7225 |
| Material Standard | ASTM A193 Grade B7 |
| Stud Standard (Metric) | DIN 976-1 / ISO 898-1 |
| Stud Standard (Inch) | ASME B16.5 / B18.31.2 |
| Thread Form | ISO Metric / UNC / UNF |
| Diameter Range | M6-M100 / ¼"-4" |
| Tensile Strength | 860 MPa (125 ksi) min |
| Yield Strength | 720 MPa (105 ksi) min |
| Hardness | Max 35 HRC / 321 HB |
Complete the Fastener Set
Technical Data
| Size (M) | Pitch (mm) | Thread Length (mm) | Min L (mm) | Max L (mm) |
|---|---|---|---|---|
| M8 | 1.25 | 22 | 40 | 300 |
| M10 | 1.5 | 26 | 50 | 400 |
| M12 | 1.75 | 30 | 60 | 500 |
| M16 | 2.0 | 38 | 70 | 600 |
| M20 | 2.5 | 44 | 80 | 800 |
| M24 | 3.0 | 54 | 100 | 1000 |
| M30 | 3.5 | 66 | 120 | 1200 |
| M36 | 4.0 | 78 | 140 | 1500 |
| M42 | 4.5 | 90 | 160 | 2000 |
| M48 | 5.0 | 102 | 180 | 2500 |
| M56 | 5.5 | 114 | 200 | 3000 |
| M64 | 6.0 | 126 | 220 | 3500 |
| M72 | 6.0 | 138 | 240 | 4000 |
| M80 | 6.0 | 150 | 260 | 4500 |
| M100 | 6.0 | 174 | 300 | 5000 |
| Standard | Covers | Thread |
|---|---|---|
| DIN 976-1 | Threaded rods & studs | Metric |
| ASME B16.5 | Stud bolts for flanges | UNC |
| ASME B18.31.2 | Continuous thread studs | UNC/UNF |
| ISO 898-1 | Mechanical properties | Metric |
| BS 4882 | Petrochemical bolting | Metric/UNC |
| Material Standard | Requirement |
|---|---|
| ASTM A193 B7 | Alloy steel, quenched & tempered |
| ASTM A320 L7 | Low temp variant |
| EN 10204 3.1 | Mill test certificate |
| EN 10204 3.2 | TPI-witnessed MTC |
Material Chemistry
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.37-0.49% |
| Manganese (Mn) | 0.65-1.10% |
| Phosphorus (P) | 0.035% max |
| Sulfur (S) | 0.040% max |
| Silicon (Si) | 0.15-0.35% |
| Chromium (Cr) | 0.75-1.20% |
| Molybdenum (Mo) | 0.15-0.25% |
| Nickel (Ni) | 0.25% max |
| Copper (Cu) | 0.25% max |
| Vanadium (V) | 0.03% max |
Fastener Performance
| Stud Size | Dry (Nm) | Lubricated (Nm) | Clamp Load (kN) |
|---|---|---|---|
| M12 | 95 | 76 | 38 |
| M16 | 235 | 188 | 78 |
| M20 | 460 | 368 | 122 |
| M24 | 800 | 640 | 176 |
| M30 | 1600 | 1280 | 285 |
| M36 | 2750 | 2200 | 410 |
| M42 | 4300 | 3440 | 570 |
| M48 | 6500 | 5200 | 750 |
Industry Applications
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