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MUKAU FASTENERS, a prominent manufacturer and supplier located in Kinshasa, Congo, is well-known for crafting top-notch Stainless Steel 321/321H Bolts that excel in high-temperature and corrosive settings. These bolts, made from titanium-stabilized austenitic stainless steel, offer remarkable resistance to oxidation, intergranular corrosion, and scaling. With a commitment to precision and strict compliance with international standards, MUKAU FASTENERS’ Stainless Steel 321/321H Bolts guarantee outstanding strength, durability, and reliability. They’re perfect for applications in chemical processing, power generation, aerospace, and marine industries, where maintaining fastening stability and mechanical integrity is crucial under extreme conditions.
Stainless Steel 321/321H Bolts are made up of 17–19% chromium, 9–13% nickel, and are stabilized with titanium (which has 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%), enhancing its strength and creep resistance at elevated temperatures. These bolts boast a tensile strength ranging from 515–750 MPa, a yield strength of 205–240 MPa, and exceptional ductility and toughness. Thanks to their titanium stabilization, they offer superior protection against intergranular corrosion and oxidation, ensuring they remain reliable and durable even in harsh, high-temperature, and corrosive environments.
| Specifications | : | ASTM A 193 ASME SA 193 |
| Standard | : | DIN, ASTM, BS and all International Standards |
| Length | : | 3 mm to 200 mm |
| Size | : | M3 – M56 | 3/6″ to 2″ | Custom Sizes |
| Type | : | Hex Head Bolts, Square Bolts, U bolts, Eye bolts, T bolt, Hex Bolt, Lag Bolts, Counter sunk Bolts, Hex Head nuts, Square nuts, Lock nuts, Eye nuts, wing nuts, T nuts, Panel Nuts, Coupling Nuts, Dome nuts, Acorn Nuts. |
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 347 | min. | – | – | – | – | – | 17.0 | 2.00 | 9.0 | – |
| max. | 0.08 | 2.0 | 1.00 | 0.045 | 0.030 | 20.0 | 3.00 | 13.0 | – | |
| 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 | ||||
| 347 | 515 | 205 | 40 | 95 | 201 |
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 Bolts find extensive use in chemical processing equipment, power generation facilities, exhaust manifolds, heat exchangers, and pressure vessels, all thanks to their outstanding heat and corrosion resistance. They perform exceptionally well in refineries, marine settings, and aerospace applications, where components face significant thermal and mechanical stresses. Additionally, these bolts are utilized in the pharmaceutical, food processing, and petrochemical sectors, ensuring secure and reliable fastening in demanding environments.
At Mukau Fasteners we ensure the highest standards in packaging for our Stainless Steel 321/321H bolts. Each bolt is thoroughly inspected and protectively wrapped to prevent damage during transport. They are then placed in tightly labeled boxes with product details and detailed quantities. Our packaging products are designed to be environmentally and physically friendly, ensuring that your high-performance bolts arrive in optimal condition 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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