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Rinku Fasteners, based in Kolkata, India, has earned a solid reputation as a reliable manufacturer and supplier of top-notch Stainless Steel 321/321H Nuts. These nuts are specifically designed to perform exceptionally well in high-temperature and corrosive settings. With a strong focus on precision manufacturing and strict adherence to international standards, Rinku Fasteners provides fastening solutions that cater to a variety of industries, including petrochemicals, power generation, chemical processing, and refineries. Their SS 321/321H Nuts are produced using cutting-edge technology and undergo thorough quality checks to guarantee durability, reliability, and structural integrity. Rinku Fasteners is dedicated to delivering outstanding products, complemented by excellent customer service and prompt delivery across different industrial sectors.
Stainless Steel 321/321H Nuts are crafted from titanium-stabilized austenitic stainless steel, enriched with chromium and nickel to boost resistance against intergranular corrosion. The 321H variant boasts a higher carbon content, which enhances its strength at elevated temperatures and improves creep resistance. These nuts excel in oxidation resistance, possess good tensile strength, and maintain stable mechanical properties even under thermal stress. Thanks to their titanium stabilization, they prevent carbide precipitation during welding and extended heat exposure. With impressive ductility, durability, and corrosion resistance, SS 321/321H Nuts are perfect for applications that involve high temperatures and challenging operational conditions.
| 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 find extensive use in industries that demand fastening solutions capable of enduring high temperatures and corrosive environments. They’re commonly utilized in heat exchangers, boilers, furnace components, and thermal processing equipment. Petrochemical plants and refineries rely on these nuts for piping systems, reactors, and pressure vessels that face extreme heat and chemical exposure. Power generation facilities also deploy these nuts in various applications, ensuring safety and reliability in their operations.
At Rinku 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.
Rinku Fasteners is a leading manufacturer and supplier of high-quality fasteners in Kolkata, India, with over 8 years of experience serving global industries.
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