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Stainless Steel 446 Nuts are engineered fasteners designed for extreme thermal and oxidizing environments where standard austenitic grades lose strength and scale resistance. Manufactured using high-chromium ferritic stainless steel (approximately 23–27% chromium), these nuts deliver exceptional resistance to oxidation at elevated temperatures, making them suitable for furnace equipment, thermal processing systems, and heavy-duty industrial assemblies. They are commonly produced in compliance with DIN 934, ISO 4032, and ASTM fastening standards depending on application requirements.
Industries such as petrochemical processing, heat treatment plants, power generation units, and industrial furnace manufacturing rely on Stainless Steel 446 Nuts for long-term mechanical stability under thermal stress. Their ability to maintain structural integrity at temperatures exceeding conventional stainless steel limits makes them a critical component in engineered systems.
KK Fasteners supplies these nuts to global OEMs and industrial distributors, ensuring dimensional accuracy, traceable material sourcing, and consistent batch quality across large-scale production runs.
| Parameter | Specification |
|---|---|
| Material | Stainless Steel 446 (Ferritic, High Chromium) |
| Grade Options | SS 446 / UNS S44600 |
| Size Range | M6 to M64 / 1/4” to 2.5” |
| Thread Type | Metric (ISO), UNC, UNF |
| Standards | DIN 934, ISO 4032, ASTM A276 (reference equivalent) |
| Surface Finish | Bright, Passivated, Pickled, Polished |
| Types Available | Hex Nuts, Heavy Hex Nuts, Custom Variants |
| Hardness | 180–220 HB (approx.) |
| Tensile Strength | Up to ~550 MPa (depending on processing condition) |
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 446 | min. | – | – | – | – | – | 23.0 | – | – | 0.10 |
| max. | 0.2 | 1.5 | 0.75 | 0.040 | 0.030 | 30.0 | – | 0.50 | 0.25 | |
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| 446 | 485 | 275 | 20 | 92 | 201 |
| STANDARD | WERKSTOFF NR. | UNS | JIS | GOST | EN |
| SS 446 | 1.4762 | S44600 | SUS 446 | - | X10CrAlSi25 |
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 |
Stainless Steel 446 Nuts are widely used in systems where high heat, oxidation, and mechanical stress occur simultaneously. Their role is critical in maintaining joint integrity in demanding industrial environments.
Stainless Steel 446 Nuts are manufactured using controlled cold forging processes followed by precision threading to achieve dimensional consistency and mechanical strength. Depending on size and application, secondary machining operations ensure accurate pitch and surface finish compliance.
Each batch undergoes strict quality validation, including dimensional inspection, hardness testing, and chemical composition verification. Surface treatment processes such as passivation enhance oxidation resistance and extend service life in harsh environments.
KK Fasteners integrates full lot traceability across production stages, ensuring every shipment can be verified against material test certificates (MTC). The manufacturing system aligns with ISO 9001 quality management standards, supporting consistent export-grade reliability for industrial procurement teams.
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Stainless Steel 446 Nuts are high-chromium ferritic fasteners designed for extreme temperature and oxidation environments. They are widely used in furnace systems, heat exchangers, and thermal processing equipment where standard stainless steels cannot maintain strength or resist scaling at elevated temperatures.
Yes, SS 446 performs significantly better than SS 304 in high-temperature conditions. While SS 304 is ideal for general corrosion resistance, SS 446 offers superior oxidation resistance and scaling protection at temperatures above 600°C, making it suitable for continuous heat exposure applications.
These nuts are typically manufactured in accordance with DIN 934, ISO 4032, and ASTM A276 material references. Depending on project requirements, additional compliance with BS or JIS standards can also be provided for international engineering compatibility.
They are commonly used in heat treatment furnaces, petrochemical plants, power generation units, industrial kilns, thermal processing systems, and heavy engineering equipment where high heat and oxidation resistance are critical for fastening reliability.
A reliable supplier should provide material traceability, certified test reports, ISO 9001 compliance, and consistent dimensional accuracy. Global export experience and in-house quality testing are also important indicators when selecting a manufacturer like KK Fasteners for bulk procurement.
Stainless Steel 446 Nuts are essential for high-temperature engineering systems where reliability under thermal stress cannot be compromised. With precision manufacturing and full material traceability, KK Fasteners supports global industrial buyers with consistent supply and engineering-grade fastener solutions.
For technical specifications, bulk pricing, or custom requirements, connect with the engineering team at KK Fasteners to request a detailed quotation or datasheet.
