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Incoloy 330 / RA 330 Nuts are high-performance fastening components engineered for extreme temperature and oxidation-resistant environments where conventional stainless steel fasteners fail. Manufactured from a nickel-iron-chromium alloy, these nuts maintain structural integrity at temperatures exceeding 1100°C, making them essential for heat-intensive industrial systems.
| Parameter | Specification |
|---|---|
| Material | Incoloy 330 (UNS N08330), RA 330 Alloy |
| Grade | ASTM B536 / ASME SB536 |
| Size Range | M3 to M64 / 1/8" to 2-1/2" |
| Thread Type | Metric (ISO), UNC, UNF, BSW |
| Standards | DIN 934, ISO 4032, ASTM A194 (custom compliance) |
| Types | Hex Nuts, Heavy Hex Nuts, Lock Nuts, Jam Nuts |
| Surface Finish | Plain, Pickled, Passivated |
| Hardness | Approx. 170–220 HB |
| Tensile Strength | ~500–700 MPa |
| Temperature Resistance | Up to 1149°C (2100°F) |
| Grade | C | Mn | Si | P | S | Cr | Cu | N | |
| Ra 330 | min. | – | – | 0.75 | – | – | 17.0 | – | 34.0 |
| max. | 0.08 | 2.0 | 1.50 | 0.030 | – | 20.0 | – | 37.0 | |
| Element | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| Incoloy 330 | 8.08 g/cm3 | 1380 °C (2520 °F) | 600 MPa | 280 MPa | 45 % |
| Grade | UNS No | Old British | Euronorm | GOST | Japanese JIS | ||
| BS | En | No | AFNOR | ||||
| Incoloy Ra 330 | N08330 | – | – | 1.4886 | – | – | – |
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 |
Incoloy 330 / RA 330 nuts are used in high-temperature and corrosive industrial environments where standard fasteners cannot maintain performance.
Production of Incoloy 330 nuts involves precision hot forging followed by CNC machining to achieve tight dimensional tolerances. Threading operations are carefully controlled to meet ISO and DIN standards, ensuring compatibility with international fastening systems.
Quality assurance includes hardness testing, dimensional inspection using calibrated gauges, and surface finish verification. Each batch undergoes material composition testing to confirm compliance with ASTM specifications.
KK Fasteners maintains full lot traceability, enabling end users to verify raw material origin and production records. The manufacturing process aligns with ISO 9001 quality systems, with additional compliance to RoHS and REACH requirements for global markets.
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Incoloy 330 nuts are high-temperature fastening components made from a nickel-iron-chromium alloy designed for extreme heat and oxidation resistance. They are widely used in furnaces, heat treatment equipment, and petrochemical systems where standard stainless steel fasteners cannot maintain strength and stability.
RA 330 nuts can typically withstand continuous service temperatures up to around 1149°C (2100°F). Their metallurgical structure resists oxidation, carburization, and thermal fatigue, making them suitable for cyclic heating environments and long-duration high-temperature operations.
These nuts are generally manufactured in compliance with ASTM B536 / ASME SB536 material standards. Dimensional conformity is maintained as per DIN 934 and ISO 4032, ensuring compatibility with global industrial fastening systems and engineering specifications.
Selection depends on operating temperature, exposure to corrosive gases, load conditions, and service environment. RA 330 is preferred for carburizing or oxidizing conditions above 1000°C, especially in furnace and chemical processing applications where long-term stability is required.
A reliable supplier should provide material traceability, third-party inspection reports, and compliance with ASTM/ISO standards. Consistent quality control and export documentation are also important. KK Fasteners supplies globally with certified materials and full inspection support for industrial buyers.
Incoloy 330 nuts play a critical role in maintaining system integrity under extreme thermal conditions where standard fasteners fail. With controlled manufacturing processes, verified material composition, and global export capability, KK Fasteners supports demanding industrial applications with consistency.
Request a technical quote or connect with the engineering team to discuss specifications, custom requirements, or bulk supply options.
