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Hastelloy B3 nuts are high-performance nickel-molybdenum alloy fasteners engineered for extreme resistance to hydrochloric acid, sulfuric acid, and other highly aggressive chemical media. These nuts are widely used in chemical processing plants, marine engineering systems, and pharmaceutical manufacturing units where conventional stainless steel fasteners fail due to rapid corrosion or pitting.
Manufactured under strict industrial standards such as ASTM B335 and DIN 2.4600 equivalents, Hastelloy B3 nuts deliver superior thermal stability and structural integrity even in fluctuating high-temperature environments. Their optimized microstructure reduces carbide precipitation, ensuring consistent performance in welded or heat-affected zones.
In critical industrial assemblies, fastener failure is not an option. That is why KK Fasteners supplies Hastelloy B3 Nuts designed for long-term reliability, full material traceability, and compliance with global engineering specifications. These nuts are engineered to maintain mechanical strength in chemically aggressive and high-load conditions, making them a preferred choice for mission-critical installations.
| Parameter | Specification |
|---|---|
| Material | Hastelloy B3 (Nickel-Molybdenum Alloy) |
| UNS Number | N10675 |
| Equivalent Grades | DIN 2.4600 |
| Size Range | M3 to M64 / 1/8" to 2.5" |
| Thread Type | Metric, UNC, UNF, BSW |
| Standards | ASTM B335, ASME SB335, DIN, ISO |
| Hardness | Up to 85 HRB (Typical) |
| Tensile Strength | Approx. 690 MPa |
| Yield Strength | Approx. 310 MPa |
| Finish | Bright, Pickled, Passivated |
| Type | Hex Nuts, Heavy Hex Nuts, Lock Nuts |
| Hastelloy B3 | Ni | C | Mo | Mn | Si | Fe | Cu | Ti | Co | Cr |
| 65.0 min | 0.01 max | 28.5 | 3.0 max | 0.10 max | 1.5 | 0.20 max | 0.2 max | 3.0 max | 1.5 |
| Property | Value |
|---|---|
| Tensile Strength | 100,000 - 110,000 psi (690 - 760 MPa) |
| Yield Strength | 50,000 psi (345 MPa) |
| Elongation at Break | Approx. 40% |
| Hardness | 85 - 100 HRB |
| Impact Resistance | Excellent |
| Fatigue Resistance | Good |
| Creep Resistance | Excellent |
| Machinability | Challenging, requires specialized tools |
| STANDARD | UNS | WERKSTOFF NR. |
| Hastelloy B3 | N010675 | 2.4600 |
| Nut Size (Nominal) | Across Flats (AF) [inches] | Across Corners (AC) [inches] | Thickness (T) [inches] |
|---|---|---|---|
| 1/4-20 | 7/16 | 0.505 | 15/64 |
| 5/16-18 | 1/2 | 0.559 | 17/64 |
| 3/8-16 | 9/16 | 0.632 | 21/64 |
| 1/2-13 | 3/4 | 0.866 | 7/16 |
| 5/8-11 | 15/16 | 1.041 | 35/64 |
Hastelloy B3 Nuts are used in environments where chemical exposure and high temperatures demand extreme material reliability.
Hastelloy B3 nuts are manufactured using precision cold forging and CNC threading to achieve accurate dimensional control and superior surface finish. The process begins with certified alloy billets that undergo controlled deformation to enhance grain structure and mechanical strength.
Every batch undergoes strict quality inspections, including dimensional verification, hardness testing, and surface integrity checks. Corrosion resistance performance is validated through controlled exposure testing for chemical compatibility.
KK Fasteners integrates full traceability systems across production stages, ensuring each lot can be tracked back to raw material certification. Compliance with ISO 9001 quality management standards, along with ASTM and DIN specifications, ensures consistent global-grade reliability for industrial procurement teams.
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Hastelloy B3 nuts are high-performance fasteners made from a nickel-molybdenum alloy designed for extreme resistance to hydrochloric acid and other reducing chemicals. They are used in chemical plants, marine systems, and industrial processing units where standard stainless steel fasteners would fail due to corrosion or pitting.
Hastelloy B3 offers significantly higher resistance to strong reducing acids, especially hydrochloric acid, compared to stainless steel grades like 304 or 316. It also provides better thermal stability and reduced risk of intergranular corrosion, making it suitable for highly aggressive chemical and high-temperature environments.
Hastelloy B3 nuts are typically manufactured in compliance with ASTM B335 and ASME SB335 standards. Equivalent international references include DIN 2.4600 and ISO metric standards. These ensure consistent mechanical strength, corrosion resistance, and dimensional accuracy for industrial applications worldwide.
These nuts are used in chemical processing plants, pharmaceutical manufacturing, marine engineering systems, flue gas desulfurization units, and petrochemical industries. They are specifically selected for equipment exposed to highly corrosive acids and high-temperature operating conditions.
A reliable manufacturer should provide certified raw material traceability, compliance with ASTM/DIN standards, in-house quality testing, and proven export experience. KK Fasteners supplies Hastelloy B3 nuts to global markets with full inspection reports, ensuring consistent quality for critical industrial applications.
Hastelloy B3 nuts are engineered for industries where chemical resistance and mechanical reliability cannot be compromised. With precision manufacturing, certified compliance, and global supply capability, KK Fasteners supports critical projects requiring high-performance alloy fastening solutions.
For technical specifications, bulk pricing, or custom manufacturing requirements, contact KK Fasteners to request a quote or engineering consultation today.
