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Hastelloy B2 nuts are precision-engineered fasteners manufactured from a nickel-molybdenum alloy designed for exceptional resistance to reducing environments, particularly hydrochloric acid across a wide concentration range. These nuts are widely specified in chemical processing plants, petrochemical systems, and pharmaceutical manufacturing equipment where conventional stainless steel fasteners fail due to aggressive corrosion.
The primary function of Hastelloy B2 nuts is to provide secure, long-term fastening in environments exposed to acids, chlorides, and high temperatures, while maintaining mechanical integrity and dimensional stability. Produced in accordance with standards such as ASTM B335 and DIN/ISO metric specifications, they are compatible with bolts and studs of similar alloy composition to prevent galvanic corrosion.
KK Fasteners supplies Hastelloy B2 nuts with full material traceability, supporting project requirements across global markets where corrosion resistance and reliability are critical performance factors.
| Material | Hastelloy B2 (UNS N10665) |
| Grade | ASTM B335 Alloy B2 |
| Size Range | M6 to M64 / 1/4" to 2-1/2" |
| Thread Type | Metric (ISO), UNC, UNF, BSW, BSF |
| Standards | DIN 934, DIN 6915, ISO 4032, ASTM B335 |
| Types | Hex Nuts, Heavy Hex Nuts, Lock Nuts, Jam Nuts |
| Surface Finish | Plain, Passivated, Pickled |
| Tensile Strength | ~760 MPa |
| Hardness | Max 100 HRB |
Hastelloy B2 |
Ni |
C |
Mo |
Mn |
Si |
Fe |
P |
S |
Co |
Cr |
Balance |
0.02 max |
26.0-30.0 |
1.0 max |
0.10 max |
2.0 max |
0.040 max |
0.030 max |
1.0 max |
1.0 max |
Density |
Melting Point |
Yield Strength (0.2%Offset) |
Tensile Strength |
Elongation |
9.2 g/cm3 |
1370 °C (2500 °F) |
Psi – 51,000, MPa – 350 |
Psi -1,10,000, MPa -760 |
40 % |
STANDARD |
UNS |
WERKSTOFF NR. |
Hastelloy B2 |
N10665 |
2.4617 |
| Hastelloy B2 Nut Size | Hastelloy B2 Finished Hex | Hastelloy B2 Heavy Hex | Hastelloy B2 Finished Jam | Hastelloy B2 Heavy Hex Jam | Hastelloy B2 Square | Hastelloy B2 Heavy Square |
| 1⁄2“ Nut | 3.75 | 6.54 | 2.62 | 4.00 | 5.78 | 7.87 |
| 5⁄8“ Nut | 7.33 | 11.9 | 4.93 | 6.96 | 10.8 | 14.3 |
| 3⁄4“ Nut | 11.9 | 19.3 | 7.70 | 11.0 | 15.4 | 23.5 |
| 7⁄8“ Nut | 19.0 | 29.7 | 12.0 | 16.7 | 24.5 | 36.2 |
| 1″ Nut | 28.3 | 42.5 | 17.6 | 23.5 | 36.3 | 51.5 |
| 11⁄8“ Nut | 40.3 | 59.2 | 24.7 | 32.4 | 52.5 | 72.4 |
| 11⁄4“ Nut | 54.3 | 78.6 | 36.1 | 45.8 | 70.6 | 95.5 |
| 13⁄8“ Nut | 73.0 | 102 | 47.9 | 59.3 | 94.5 | 125.0 |
| 11⁄2“ Nut | 94.3 | 131 | 60.9 | 74.8 | 122 | 161 |
| 15⁄8“ Nut | 162 | 91.6 | ||||
| 13⁄4“ Nut | 151 | 204 | 100 | 114 | ||
| 17⁄8“ Nut | 241 | 134 | ||||
| 2″ Nut | 224 | 299 | 140 | 165 | ||
| 21⁄4“ Nut | 419 | 227 | ||||
| 21⁄2“ Nut | 564 | 332 | ||||
| 23⁄4“ Nut | 738 | 429 | ||||
| 3″ Nut | 950 | 545 | ||||
| 31⁄4“ Nut | 1194 | 651 | ||||
| 31⁄2“ Nut | 1526 | 851 | ||||
| 33⁄4“ Nut | 1812 | 1005 | ||||
| 4″ Nut | 2180 | 1200 |
Hastelloy B2 nuts are used in highly corrosive environments where resistance to reducing acids is critical for maintaining system integrity and safety.
Hastelloy B2 nuts are typically produced through hot forging followed by CNC machining to achieve precise threading and dimensional accuracy. Heat treatment processes are applied to optimize mechanical properties and corrosion resistance.
Quality assurance includes dimensional inspection using calibrated gauges, hardness testing (Rockwell scale), and surface integrity verification after pickling or passivation. Each batch undergoes PMI (Positive Material Identification) to confirm alloy composition.
KK Fasteners follows ISO 9001-certified processes with full lot traceability, ensuring that every shipment meets international quality and compliance standards required for critical industrial applications.
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Hastelloy B2 nuts are corrosion-resistant fasteners made from a nickel-molybdenum alloy (UNS N10665). They are specifically designed for use in reducing chemical environments, especially where exposure to strong acids like hydrochloric acid would quickly degrade standard stainless steel fasteners.
Yes, Hastelloy B2 nuts provide excellent resistance to hydrochloric acid across a wide range of concentrations and temperatures. This makes them one of the most suitable materials for acid processing systems where long-term corrosion resistance is essential.
Hastelloy B2 fasteners are typically manufactured in accordance with ASTM B335 for material composition, along with dimensional standards such as DIN 934, ISO 4032, and other international specifications to ensure consistency and compatibility.
Selection depends on chemical exposure, operating temperature, mechanical load, and compatibility with mating fasteners. Hastelloy B2 is ideal for reducing environments, but for mixed or oxidizing conditions, alternative nickel alloys may be more suitable.
A reliable supplier should offer ISO-certified manufacturing, full material traceability, and PMI testing. Companies like KK Fasteners support global projects with consistent quality, documentation, and export compliance across multiple industries.
Hastelloy B2 nuts play a critical role in maintaining reliability in highly corrosive industrial environments where material failure is not an option. With controlled manufacturing processes, certified materials, and global supply capability, KK Fasteners supports projects that demand consistency and traceability. Connect with the engineering team to request a quote or discuss custom specifications for your application.
