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Super Duplex Steel S32760 Nuts are high-performance fasteners engineered for critical applications where exceptional strength and corrosion resistance are non-negotiable. Manufactured from UNS S32760 super duplex alloy, these nuts combine high tensile strength with superior resistance to chloride-induced stress corrosion cracking, making them suitable for offshore, marine, and chemical processing environments.
| Parameter | Details |
|---|---|
| Material | Super Duplex Steel UNS S32760 |
| Grade | ASTM A194 Gr. 8M, A479 UNS S32760 |
| Size Range | M6 to M100 / 1/4" to 4" |
| Thread Type | Metric, UNC, UNF, BSW, BSF |
| Standards | DIN 934, DIN 439, ISO 4032, ASTM A194 |
| Type Variants | Hex Nuts, Heavy Hex Nuts, Lock Nuts, Jam Nuts |
| Surface Finish | Plain, PTFE Coated, Passivated, Hot-Dip Galvanized |
| Tensile Strength | ≥ 750 MPa |
| Hardness | Max 32 HRC |
Element |
Content (%) |
|---|---|
Chromium, Cr |
24 – 26 |
Nickel, Ni |
6 – 8 |
Molybdenum, Mo |
3 – 5 |
Manganese, Mn |
1.20 max |
Silicon, Si |
0.80 max |
Copper, Cu |
0.50 max |
Nitrogen, N |
0.24 – 0.32 |
Phosphorous, P |
0.035 max |
Carbon, C |
0.030 max |
Sulfur, S |
0.020 max |
Iron, Fe |
Balance |
| S32760 | Density | Melting Point | Yield Strength (0.2%Offset) | Tensile Strength | Elongation |
| 7.8 g/cm3 | 1350 °C (2460 °F) | Psi – 80000 , MPa – 550 | Psi – 116000 , MPa – 800 | 15 % |
| STANDARD | UNS | WERKSTOFF NR. |
| Super Duplex S32760 | S32760 | 1.4410 |
All measurements in millimeters
Nominal Size or Basic Major Thread Diameter |
F |
G |
H |
||||||
Width Across Flats |
Width Across Corners |
Thickness |
|||||||
Basic |
Max |
Min |
Max |
Min |
Basic |
Max |
Min |
||
1/4 |
.2500 |
1/2 |
.500 |
.488 |
.577 |
.556 |
15/64 |
.250 |
.218 |
5/16 |
.3125 |
9/16 |
.562 |
.546 |
.650 |
.622 |
19/64 |
.314 |
.280 |
3/8 |
.3750 |
11/16 |
.688 |
.669 |
.794 |
.763 |
23/64 |
.377 |
.341 |
7/16 |
.4375 |
3/4 |
.750 |
.728 |
.866 |
.830 |
27/64 |
.441 |
.403 |
1/2 |
.5000 |
7/8 |
.875 |
.850 |
1.010 |
.969 |
31/64 |
.504 |
.464 |
9/16 |
.5625 |
15/16 |
.938 |
.909 |
1.083 |
1.037 |
35/64 |
.568 |
.526 |
5/8 |
.6250 |
1-1/16 |
1.062 |
1.031 |
1.227 |
1.175 |
39/64 |
.631 |
.587 |
3/4 |
.7500 |
1-1/4 |
1.250 |
1.212 |
1.443 |
1.382 |
47/64 |
.758 |
.710 |
7/8 |
.8750 |
1-7/16 |
1.438 |
1.394 |
1.660 |
1.589 |
55/64 |
.885 |
.833 |
1 |
1.0000 |
1-5/8 |
1.325 |
1.575 |
1.876 |
1.796 |
63/64 |
1.012 |
.956 |
1-1/8 |
1.1250 |
1-13/16 |
1.812 |
1.756 |
2.093 |
2.002 |
1-7/64 |
1.139 |
1.079 |
1-1/4 |
1.2500 |
2 |
2.000 |
1.938 |
2.309 |
2.209 |
1-7/32 |
1.251 |
1.187 |
1-3/8 |
1.3750 |
2-3/16 |
2.188 |
2.119 |
2.526 |
2.416 |
1-11/32 |
1.378 |
1.460 |
1-1/2 |
1.5000 |
2-3/8 |
2.375 |
2.300 |
2.742 |
2.622 |
1-15/32 |
1.505 |
1.433 |
1-5/8 |
1.6250 |
2-9/16 |
2.562 |
2.481 |
2.959 |
2.828 |
1-19/32 |
1.632 |
1.556 |
1-3/4 |
1.7500 |
2-3/4 |
2.750 |
2.662 |
3.175 |
3.035 |
1-23/32 |
1.759 |
1.679 |
2 |
2.0000 |
3-1/8 |
3.125 |
3.025 |
3.608 |
3.449 |
1-31/32 |
2.013 |
1.925 |
2-1/4 |
2.2500 |
3-1/2 |
3.500 |
3.388 |
4.041 |
3.862 |
2-13/64 |
2.251 |
2.155 |
2-1/2 |
2.5000 |
3-7/8 |
3.875 |
3.750 |
4.474 |
4.275 |
2-29/64 |
2.505 |
2.401 |
2-3/4 |
2.7500 |
4-1/4 |
4.250 |
4.112 |
4.907 |
4.688 |
2-45/64 |
2.759 |
2.647 |
3 |
3.0000 |
4-5/8 |
4.625 |
4.475 |
5.340 |
5.102 |
2-61/64 |
3.013 |
2.893 |
3-1/4 |
3.2500 |
5 |
5.000 |
4.838 |
5.774 |
5.515 |
3-3/16 |
3.252 |
3.124 |
3-1/2 |
3.5000 |
5-3/8 |
5.375 |
5.200 |
6.207 |
5.928 |
3-7/16 |
3.506 |
3.370 |
3-3/4 |
3.7500 |
5-3/4 |
5.750 |
5.562 |
6.640 |
6.341 |
3-11/16 |
3.670 |
3.616 |
4 |
4.0000 |
6-1/8 |
6.125 |
5.925 |
7.073 |
6.755 |
3-15/16 |
4.014 |
3.862 |
Super Duplex Steel S32760 Nuts are used in industries requiring high strength and corrosion resistance, particularly in aggressive and high-pressure environments.
These nuts are typically produced through hot forging or precision CNC machining, followed by solution annealing and rapid quenching to achieve optimal phase balance. Threading is executed with tight tolerances to ensure proper load distribution and assembly fit.
Quality control includes dimensional inspection using calibrated gauges, hardness testing, tensile verification, and surface finish evaluation. Each batch undergoes PMI (Positive Material Identification) and corrosion resistance checks.
At KK Fasteners, every shipment is supported with mill test certificates (EN 10204 3.1), ensuring full traceability and compliance with ISO 9001 quality management systems.
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Super Duplex Steel S32760 nuts are high-strength fastening components made from UNS S32760 alloy. They are specifically designed for use in harsh environments where both mechanical strength and corrosion resistance are critical, such as offshore, marine, and chemical processing applications.
S32760 nuts contain high levels of chromium, molybdenum, and tungsten, giving them a PREN value above 40. This ensures excellent resistance to pitting, crevice corrosion, and chloride stress corrosion cracking, along with nearly double the strength of standard stainless steel grades like 316.
These nuts are typically manufactured in accordance with ASTM A194, DIN 934, ISO 4032, and BS standards. These specifications ensure dimensional accuracy, mechanical performance, and compatibility with global engineering systems.
Selection depends on factors such as load requirements, environmental exposure, and compatibility with mating bolts. For aggressive environments like offshore or chemical plants, coated variants such as PTFE-coated nuts are often recommended to reduce galling and enhance corrosion resistance.
A reliable supplier should offer ISO-certified production, full material traceability, and compliance with international standards. KK Fasteners supports global buyers with documented quality checks, consistent supply, and export experience across multiple industries.
Super Duplex Steel S32760 Nuts deliver long-term reliability in environments where standard fasteners fail due to corrosion or mechanical stress. With controlled manufacturing processes, traceable materials, and export-ready packaging, KK Fasteners supports project-critical requirements across industries.
Request a quote or connect with the engineering team to discuss specifications and global supply options tailored to your application.
