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Product Overview
ASTM A193 Grade B7 nuts are high-strength, heat-treated alloy steel fasteners manufactured to pair with B7 bolts and studs for critical bolted joints in pressure vessels, piping, and flanged connections. Produced from chromium-molybdenum steel (typically AISI 4140/4142), these nuts are quenched and tempered to achieve a minimum tensile strength of 100 ksi (690 MPa) and are engineered for high-pressure, high-temperature, and corrosive service environments.
ASTM A193 Grade B7 nuts are specified for petrochemical, power generation, and refinery applications, where reliable clamping force and resistance to hydrogen embrittlement, stress corrosion cracking, and elevated temperature creep are essential. They are supplied with full traceability and mechanical test certification per ASTM A194 Grade 2H or 7, depending on the application.
| Material | Alloy Steel (AISI 4140/4142) |
| UNS Number | K11597 |
| DIN Number | 1.7225 |
| Material Standard | ASTM A193 Grade B7 |
| Nut Standard (Metric) | DIN 934 / ISO 4032 |
| Nut Standard (Inch) | ASME B18.2.2 |
| Thread Form | ISO Metric / UNC / UNF |
| Diameter Range | M6-M100 / ¼"-4" |
| Tensile Strength | 100 ksi (690 MPa) min |
| Yield Strength | 85 ksi (585 MPa) min |
| Hardness | 24-35 HRC |
Complete the Fastener Set
Technical Data
| Size (M) | Pitch (mm) | A/F (mm) | Height (mm) | Min L (mm) | Max L (mm) |
|---|---|---|---|---|---|
| M6 | 1.0 | 10 | 5.0 | 5 | 10 |
| M8 | 1.25 | 13 | 6.5 | 6 | 12 |
| M10 | 1.5 | 17 | 8.0 | 8 | 16 |
| M12 | 1.75 | 19 | 10.0 | 10 | 20 |
| M16 | 2.0 | 24 | 13.0 | 13 | 26 |
| M20 | 2.5 | 30 | 16.0 | 16 | 32 |
| M24 | 3.0 | 36 | 19.0 | 19 | 38 |
| M30 | 3.5 | 46 | 24.0 | 24 | 48 |
| M36 | 4.0 | 55 | 29.0 | 29 | 58 |
| M42 | 4.5 | 65 | 34.0 | 34 | 68 |
| M48 | 5.0 | 75 | 38.0 | 38 | 76 |
| M56 | 5.5 | 85 | 45.0 | 45 | 90 |
| M64 | 6.0 | 95 | 51.0 | 51 | 102 |
| M72 | 6.0 | 105 | 57.0 | 57 | 114 |
| M80 | 6.0 | 115 | 63.0 | 63 | 126 |
| M100 | 6.0 | 145 | 80.0 | 80 | 160 |
| Standard | Covers | Thread |
|---|---|---|
| DIN 934 | Hex nuts | Metric |
| ISO 4032 | Hex nuts | Metric |
| ASME B18.2.2 | Hex & heavy hex nuts | UNC/UNF |
| ASTM A194 | Heavy hex nuts for high-pressure/high-temp | UNC/UNF |
| BS 1768 | Hex nuts | BSW/BSF |
| Material Standard | Requirement |
|---|---|
| ASTM A193 B7 | Alloy steel, quenched & tempered |
| ASTM A194 2H | Heavy hex nut mechanical |
| 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 |
Fastener Performance
| Nut Size | Recommended Torque (Nm) | Proof Load (kN) |
|---|---|---|
| M12 | 90 | 62 |
| M16 | 220 | 120 |
| M20 | 430 | 187 |
| M24 | 750 | 270 |
| M30 | 1500 | 420 |
| M36 | 2600 | 610 |
| M42 | 4100 | 870 |
| M48 | 6100 | 1200 |
Industry Applications
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