Andre Stainless is a leading manufacturer and supplier of premium stainless steel products, headquartered in Pulau Ujong, Singapore. With a steadfast commitment to quality and innovation, we deliver stainless steel solutions tailored to the diverse needs of industries across the region. Among our specialized offerings, Stainless Steel 321 Nuts stand out for their exceptional resistance to corrosion, high-temperature performance, and mechanical strength. These fasteners are particularly suited for chemical processing, aerospace, and other high-stress environments. Manufactured with precision and delivered with reliability, our 321 Nuts have earned the trust of clients seeking long-lasting, industry-grade fastening solutions.
Stainless Steel 321 Nuts are made from a titanium-stabilized austenitic stainless steel containing 17–19% chromium, 9–12% nickel, and titanium to prevent carbide precipitation. This composition provides excellent resistance to oxidation, especially in temperatures of up to 870°C, as well as high intergranular corrosion resistance following welding. These nuts have high tensile strength, good creep properties, and stability under heat, enabling them to be used in continuous service under severe environments. Their ductility, formability, and heat scaling resistance enable them to be reliable in both static and dynamic use under thermal stress.
| Specifications Of | 321 Stainless Steel Nuts |
|---|---|
| Length Sizes | 3 millimeter to 200 millimeter |
| Head Type | Hex, Square |
| Standard | ASME B18.2.2 ASME B16.5 ASME B18.5 ANSI B 18.2.4 2M DIN = DIN 931, DIN 933, DIN 934, DIN 970 ISO = ISO 4033, ISO 4032, JIS UTS = UNF, NPTF, NPT, UNC, UNEF, UNS |
| Surface Coating | Hot Dipped Galvanizing Coated Bolts Phosphate Coated Bolts Zinc Coated Bolts Cadmium Coated Bolts Teflon Coated Bolts Xylon Coated Bolts |
| Type Of Nuts | Coupling Nuts, Nylon Insert Nuts, Flange Hex Nuts, Heavy Hex Nuts, Square Nuts |
|
Grade |
Mn |
N |
P |
C |
S |
Cr |
Mo |
Si |
Ni |
Other |
|
|
321 Stainless Steel Nuts |
minimum maximum |
2.00 |
0.10 |
0.045 |
– 0.08 |
0.030 |
17.0 19.0 |
– |
0.75 |
9.0 12.0 |
Ti=5(C+N) 0.70 |
|
Grade |
Tensile Strength (MPa) minimum |
Yield Strength 0.2% Proof (MPa) minimum |
Elongation (% in 50mm) minimum |
Hardness |
|
|
Rockwell B (HR B) maximum |
Brinell (HB) maximum |
||||
|
321 Stainless Steel Nuts |
515 |
205 |
40 |
95 |
217 |
Contact us to get a quick quote for your requirement.
An ideal corrosion resistant material for high humidity environments. Stainless steel 321 nuts are available in sizes from M6 to M36 and are used in aerospace and chemical applications, providing excellent oxidation resistance and durability
The stainless steel 321 coupling nuts are designed to hold threaded rods together under extreme conditions. Sizes range from M6 to M36, making it suitable for high-temperature aerospace and medical applications where reliability is critical.
The stainless steel 321 nylon insert nuts have a nylon insert for a secure fastening. Available in sizes from M6 to M24, they offer stability and resistance to high temperatures, and are ideal for use in industrial appliances and air filters.
Stainless steel 321 flange hex nuts for enhanced weight distribution with integrated flanges. Sizes range from M6 to M24, making it perfect for hot temperature environments, such as chemical processing and aerospace applications.
The heavy duty stainless steel 321 hex nuts are designed for high pressure, high temperature applications. Available in sizes from M6 to M36, they are used in applications requiring high strength and thermal stability, including aerospace and chemical applications
Stainless steel 321 square nuts provide large surface area for efficient torque application. Sizes range from M6 to M24, making them suitable for hot and humid environments, such as in chemical processing and industrial machinery.
Andre Stainless provides nuts made of stainless steel 321, which assures consistent performance. The materials undergo an extensive series of tests, including hardness testing, spectro analysis, PMI, and flaring tests. We further undertake micro and macro tests, pitting resistance, and IGC tests for superior quality in every material we deliver. Apart from these strict testing procedures, we give full documentation which includes commercial invoices, packing lists containing the net and gross weight, box number, and labels. The legalized or attested Certificate of Origin along with Third-Party Inspection Certificates assures full assurance about our commitment towards superior products and unmatched customer satisfaction.
Stainless Steel 321 Nuts are widely used in aerospace and automotive sectors, particularly for exhaust systems, engine components, and thermal insulation assemblies, thanks to their stability at elevated temperatures. In the petrochemical and power generation industries, they’re chosen for use in heat exchangers, furnace parts, and boiler systems, where both heat and corrosion resistance are critical. These nuts are also used in medical equipment, filtration systems, and chemical storage units, offering long-term reliability and safety. Their ability to perform under thermal cycling and harsh conditions makes them ideal for any high-temperature, corrosion-prone environme
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