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MUKAU FASTENERS, a leading manufacturer and supplier located in Kinshasa, Congo, specializes in top-notch Stainless Steel 321/321H Nuts that deliver outstanding performance in high-temperature and corrosive settings. These titanium-stabilized stainless steel nuts are crafted to withstand intergranular corrosion, oxidation, and scaling, making them perfect for tough industrial environments. MUKAU FASTENERS’ Stainless Steel 321/321H Nuts are precision-engineered for strength, reliability, and durability. They find extensive use in the petrochemical, power generation, marine, and aerospace sectors, ensuring long-lasting fastening integrity and stability even under continuous heat and chemically aggressive conditions.
Stainless Steel 321/321H Nuts are made up of 17–19% chromium, 9–13% nickel, and are stabilized with titanium (five times the carbon content) to avoid carbide precipitation during welding and heat exposure. The 321H variant features a higher carbon content (0.04–0.10%) for enhanced strength at elevated temperatures. These nuts boast a tensile strength of 515–750 MPa, a yield strength of about 205–240 MPa, along with excellent ductility and toughness. The titanium stabilization provides superior resistance to intergranular corrosion, oxidation, and creep, making them ideal for high-stress, high-temperature industrial applications.
| Specifications | IS, BS, ASTM |
| Standard | ASTM / ASME – A/ SA 193 |
| Length | 3 mm to 200 mm |
| Size | M02 to M33 |
| Type | Hex Nuts, Dome Nuts, Hex Machine Screw Nuts, Hex Lock Nuts Nylon Insert, Hex Jam Nuts, Hex Jam Nylon Lock Nuts, Heavy Hex Nuts, Wing Nuts, Cap Nuts, Acorn Nuts, Square Nuts, K-Lock Nuts, Prevailing Torque Lock Nuts, Top Lock Nuts, Two-Way Reversible Lock Nuts, Pin-Lock Nuts, T-Nuts, Coupling Nuts, T-Slot Nuts, Castle Nuts, Flange Nuts Serrated, Machine Hex Nuts, Finished Hex Nuts, Forged Eye Nut, Rivet Nuts, Slotted Hex Nut, Acme Hex Nuts, Nylock Nuts, Anco Locknuts, Flexloc Nuts, Reversible Locknuts, Panel Nut, Poly Nut, Conelock Nut, Self Clinching Nuts, Domed Cap Nuts, Imperial Thread Nuts, Imperial Thread Nylock Nuts, Sleeve Nuts, Thin Nuts, Weld Nuts, High Tensile Nuts, Cage Nuts, Security Nuts, Imperial Nuts, Industrial Nuts, Miscellaneous Nuts, Insert Nuts, Knurled Nuts, Round Nuts |
| Element | SS 321 |
| Ni | 9.0 – 12.0 |
| C | 0.08 |
| Mn | 2.0 max |
| P | 0.045 max |
| S | 0.030 max |
| Si | 0.75 max |
| Cr | 17.0 – 19.0 |
| Mo | – |
| N | 0.10 |
| Element | SS 321 |
| Tensile Strength (MPa) min | 515 |
| Yield Strength 0.2% Proof (MPa) min | 205 |
| Elongation (% in 50mm) min | 40 |
| Rockwell B (HR B) max Hardness | 95 |
| Brinell (HB) max Hardness | 217 |
To satisfy our clients needs by providing high quality products at competitive price as per the schedule and to maintain long term relationship with our clients.
Stainless Steel 321/321H Nuts are commonly found in chemical processing plants, oil refineries, power generation systems, exhaust manifolds, heat exchangers, and pressure vessels due to their remarkable high-temperature and corrosion resistance. They excel in applications that involve thermal cycling, oxidation, and carburization, ensuring secure fastening even in extreme conditions. These nuts are also utilized in aerospace, marine, pharmaceutical, and food processing industries, providing durability and strength in challenging environments. MUKAU FASTENERS’ Stainless Steel 321/321H Nuts are the go-to choice for those seeking reliability and performance in demanding applications.
At Mukau Fasteners, we take great care in installing our Stainless Steel 321/321H nuts to ensure they arrive in pristine condition. Each nut is carefully inspected and individually wrapped with protective material to prevent corrosion. They are then placed in tightly labeled boxes with detailed product details and quantities. Our packaging is designed to protect the environment and physical effects, ensuring that your high-performance fruit is delivered safely and ready for immediate use.
Mukau Fasteners is a leading manufacturer and supplier of high-quality fasteners in Kinshasa, Congo, with over 8 years of experience serving global industries.
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