Min Temp
Max Temp
🌡
⚡
🛡
⚖
Product Overview
ASTM A193 Grade B16 nuts are high-strength alloy steel fasteners designed for use in high-pressure, high-temperature bolted connections. Manufactured from chromium-molybdenum-vanadium steel, these nuts are heat treated to achieve superior mechanical properties, making them ideal for critical applications in the petrochemical, power generation, and oil & gas industries. ASTM A193 B16 nuts are typically paired with B16 bolts and studs for flange joints, pressure vessels, and piping systems operating at elevated temperatures up to 593°C (1100°F).
With a minimum tensile strength of 860 MPa and excellent creep resistance, B16 nuts are specified for Class 1 and Class 2 pressure boundary bolting in ASME B16.5 and B16.47 flanges, especially where higher strength than B7 is required. All nuts are supplied with full traceability and certification to ASTM A194 Grade 7 or 4, as appropriate.
| Material | Alloy Steel (Cr-Mo-V) |
| ASTM Grade | A193 Grade B16 |
| Nut Standard | ASTM A194 Grade 7 / 4 |
| UNS Number | K31816 |
| DIN Number | 1.7711 |
| Material Standard | ASTM A193 / A194 |
| Nut Standard (Metric) | DIN 934 / ISO 4032 |
| Nut Standard (Inch) | ASME B18.2.2 |
| Thread Form | ISO Metric / UNC / UNF |
| Size Range | M6-M100 / ¼"-4" |
| Tensile Strength | 860 MPa (125 ksi) min |
| Yield Strength | 690 MPa (100 ksi) min |
| Hardness | 24-36 HRC |
Complete the Fastener Set
Technical Data
| Size (M) | Pitch (mm) | A/F (mm) | Height (mm) |
|---|---|---|---|
| M6 | 1.0 | 10 | 5.0 |
| M8 | 1.25 | 13 | 6.5 |
| M10 | 1.5 | 17 | 8.0 |
| M12 | 1.75 | 19 | 10.0 |
| M16 | 2.0 | 24 | 13.0 |
| M20 | 2.5 | 30 | 16.0 |
| M24 | 3.0 | 36 | 19.0 |
| M30 | 3.5 | 46 | 24.0 |
| M36 | 4.0 | 55 | 29.0 |
| M42 | 4.5 | 65 | 34.0 |
| M48 | 5.0 | 75 | 38.0 |
| M56 | 5.5 | 85 | 45.0 |
| M64 | 6.0 | 95 | 51.0 |
| M72 | 6.0 | 105 | 57.0 |
| M80 | 6.0 | 115 | 64.0 |
| M100 | 6.0 | 145 | 80.0 |
| 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 | High-pressure nuts | UNC/UNF/Metric |
| Material Standard | Requirement |
|---|---|
| ASTM A193 B16 | Bolting material |
| ASTM A194 7/4 | Nut mechanicals |
| EN 10204 3.1 | Mill test certificate |
| EN 10204 3.2 | TPI-witnessed MTC |
Material Chemistry
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.37-0.48 |
| Manganese (Mn) | 0.75-1.00 |
| Phosphorus (P) | 0.035 max |
| Sulfur (S) | 0.040 max |
| Silicon (Si) | 0.15-0.35 |
| Chromium (Cr) | 0.80-1.10 |
| Molybdenum (Mo) | 0.15-0.25 |
| Vanadium (V) | 0.20-0.30 |
| Nickel (Ni) | 0.25 max |
| Copper (Cu) | 0.20 max |
Fastener Performance
| Nut Size | Recommended Torque (Nm) | Clamp Load (kN) |
|---|---|---|
| M12 | 90 | 35 |
| M16 | 220 | 70 |
| M20 | 440 | 110 |
| M24 | 760 | 160 |
| M30 | 1550 | 260 |
| M36 | 2700 | 380 |
| M42 | 4200 | 540 |
| M48 | 6300 | 720 |
Industry Applications
Answers for Buyers
