Njabulo Stainless stands out as a top-notch manufacturer and supplier of Stainless Steel 321 Nuts, proudly based in Cape Town, South Africa. This company is all about crafting high-quality austenitic stainless steel fasteners that excel in corrosion resistance, strength, and durability, especially in high-temperature settings. Their Stainless Steel 321 Nuts are specially treated with niobium to ward off intergranular corrosion, making them perfect for industries like chemical, petrochemical, power generation, and marine. With cutting-edge manufacturing facilities and a commitment to strict quality control, Njabulo Stainless delivers precision-engineered nuts that adhere to international standards, ensuring reliable and long-lasting fastening solutions for machinery, equipment, and structural assemblies.
When it comes to composition, Stainless Steel 321 Nuts are primarily made up of iron, chromium (17–19%), nickel (9–13%), and niobium (as a stabilizer), along with trace amounts of manganese, silicon, and carbon (capped at 0.08%). The niobium stabilization is key, as it prevents carbide precipitation during welding, which in turn offers outstanding resistance to intergranular corrosion while keeping high tensile strength, toughness, and durability intact. These nuts boast a tensile strength of about 600–800 MPa, a yield strength of around 300–500 MPa, and impressive elongation, making them a great fit for high-stress fastening tasks in both elevated temperatures and corrosive environments.
| 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 |
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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.
Njabulo 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 a go-to choice in industries that demand high-temperature corrosion resistance and mechanical stability. They shine in applications like boiler components, heat exchangers, superheaters, reheaters, pressure vessels, and piping systems within chemical and petrochemical plants. Plus, they find their place in marine and power generation equipment, as well as industrial machinery that faces oxidizing and corrosive conditions. With their unbeatable combination of strength, corrosion resistance, and durability, 321 nuts are the preferred option for high-performance and high-temperature industrial applications.
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