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Mira Fasteners is a reliable manufacturer and supplier of Stainless Steel 321 / 321H Bolts, proudly based in Kuala Lumpur, Malaysia. These bolts are specifically designed to handle high temperatures and environments that are susceptible to intergranular corrosion. The Stainless Steel 321 is stabilized with titanium to avoid carbide precipitation, while the 321H variant has a higher carbon content, which boosts its creep resistance and strength at elevated temperatures. Mira Fasteners provides these precision-engineered bolts to various industries, including chemical processing, aerospace, heat treatment, and power generation across Malaysia and Southeast Asia.
Typically, Stainless Steel 321 / 321H Bolts contain 17–20% chromium and 9–13% nickel, with titanium added for stabilization in SS 321, and a higher carbon content in SS 321H (0.04–0.10%) to enhance performance at high temperatures. These bolts boast a tensile strength of around 515–700 MPa and can be used continuously at temperatures up to 870°C.
| 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 are used in applications requiring high thermal resistance and strong corrosion protection. They are ideal for aerospace, automotive exhaust systems and high-temperature gasoline engines. These bolts are also used in medicine because of their resistance to sulfuric and phosphoric acids. Their durable characteristics ensure reliable performance in high-pressure environments, making them suitable for a wide range of industrial applications where strength and durability are important
You’ll find Stainless Steel 321 / 321H Bolts in a variety of applications, such as exhaust systems, pressure vessels, refinery equipment, furnace components, and thermal oxidizers. They provide outstanding resistance to oxidation and intergranular corrosion, even after welding and extended exposure to high temperatures. The titanium stabilization in SS 321 ensures that the structure remains stable during welding, while the increased carbon in SS 321H improves long-term strength in high-stress thermal conditions, making these bolts perfect for fastening in demanding, heat-intensive environments.
Mira Fasteners is a leading manufacturer and supplier of high-quality fasteners in Kuala lumpur, Malaysia, with over 8 years of experience serving global industries.
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