Company Introduction
Mcneil Instruments is a trusted name in the global steel and metal industry, delivering premium-quality products and customized solutions to meet diverse industrial needs. With a strong presence in the UAE and across international markets, we specialize in manufacturing and supplying stainless steel pipes, tubes, flanges, fasteners, and other high-performance metal products.
Our commitment to quality, innovation, and customer satisfaction sets us apart. Backed by years of industry expertise, we adhere to international standards and ensure precision engineering in every product we deliver. At Mcneil Steel & Alloys FZE, we aim to build long-lasting relationships with clients by providing reliable, durable, and cost-effective solutions for industries such as oil & gas, construction, marine, and petrochemicals.
What is Stainless Steel 321 Screw?
Stainless Steel 321 screws are titanium-stabilized austenitic stainless steel fasteners designed to provide exceptional resistance to intergranular corrosion, especially after exposure to temperatures ranging from 427°C to 816°C. The addition of titanium prevents carbide precipitation during welding and high-heat applications, making SS 321 screws ideal for thermal processes, exhaust systems, and high-temperature bolting. They offer excellent strength, oxidation resistance, and long-term stability in elevated-temperature environments.
Applications of Stainless Steel 321 Screw
- High-Temperature Processing – Furnaces, heat exchangers, thermal shields, and industrial heaters.
- Automotive & Aerospace – Exhaust systems, manifolds, and high-heat structural fittings.
- Chemical & Petrochemical Plants – Applications involving heat cycles and corrosive chemicals.
- Power Generation – Turbines, boilers, and superheater components.
- Pharmaceutical Equipment – Machinery exposed to steam sanitization and hot processing.
- Refineries – Fasteners subjected to cyclic thermal and corrosive environments.
Common Uses of Stainless Steel 321 Screw
- General fastening in high-temperature structural applications.
- Used in high-heat exhaust components and thermal equipment.
- Fixing components in boilers, pressure vessels, and chemical processing units.
- Construction of industrial ovens, furnaces, and heating systems.
- Supports rotating machinery and thermal cycling units.
- Used in aerospace and automotive applications requiring stability at high temperatures.
Washer Specifications
| Product | Washers – Plain, Lock, Spring, Tab, Structural, Sealing & More |
|---|---|
| Size Range | M2 to M100 or Custom Sizes |
| Thickness | 0.3 mm to 6 mm (or as per requirement) |
| Grades | Stainless Steel 304 / 316 / 316L, Carbon Steel, Brass, Copper, Inconel, Monel, Hastelloy, Titanium, etc. |
| Standard Sizes | M2 to M100 |
|---|---|
| Thickness | 0.3 mm to 6 mm |
| Custom Options | Available on Request |
| DIN (Germany) | DIN 125, 127, 433, 6798, 9021, 7349 |
|---|---|
| ISO (International) | ISO 7089/7090, 7092, 10673, 8738 |
| ASTM (USA) | ASTM F436, F959, F844 |
| ANSI (USA) | ANSI B18.22.1 |
| BS (British) | BS 4320, 4464, 1802 |
| IS (India) | IS 2016, 3063, 5372, 5624 |
| SAE (USA) | SAE J403, J995 |
| Types of Washers |
Plain Flat Washer Spring Lock Washer Sealing Washer Tab Washer Square Washer Structural Washer Square Beveled Washer Wedge Lock Washer Self-Locking Washer Hex Washer Industrial Washer |
|---|
| Stainless Steel | 304, 304L, 316, 316L, 310, 321, 347, etc. |
|---|---|
| Carbon Steel | Grades C1018, C1045, C1020, etc. |
| Alloy Steel | EN8, EN19, EN24, etc. |
| Other Metals | Brass, Copper, Aluminum, Monel, Inconel, Hastelloy, Titanium |
| Surface Coatings | PTFE, Zinc Plating, Hot Dip Galvanizing, Black Oxide, Nickel, Teflon, Xylon, Geomet |
|---|---|
| Finishes | Self-Color, Bright, Matte, Passivated, Dacromet |
| Industries |
Oil & Gas Petrochemicals Construction Automotive Aerospace Marine Power Generation General Engineering |
|---|
| Test Certificate | EN 10204 / 3.1 |
|---|---|
| Additional Certs | PED 97/23/EC, AD 2000 W2, ISO 9001 |
| Compliance | RoHS, REACH |
| Packing Types | Small Boxes, Cartons, HDPE Bags, Pallets, or as per customer request |
|---|---|
| Labeling | Grade, Size, Batch No., Logo (if required) |
Most Selling Types Of Washers
Plain Flat Washer
Wedge Lock Washer
Square Washer
Spring Lock Washer
Self Locking Washer
Sealing Washer
Hex Washer
Industrial Washer
Tab Washer
Structural Washer
Square Beveled Washer
Stainless Steel 321 Screw Manufacturer, Supplier, Exporter in Countries
| Country | Country | Country | Country |
|---|---|---|---|
| Stainless Steel 321 Screw Exporter in Kuwait | Stainless Steel 321 Screw Exporter in India | Stainless Steel 321 Screw Exporter in Oman | Stainless Steel 321 Screw Exporter in Iran |
| Stainless Steel 321 Screw Exporter in Qatar | Stainless Steel 321 Screw Exporter in China | Stainless Steel 321 Screw Exporter in UAE | Stainless Steel 321 Screw Exporter in Africa |
| Stainless Steel 321 Screw Exporter in Turkey | Stainless Steel 321 Screw Exporter in Mexico | Stainless Steel 321 Screw Exporter in Canada | Stainless Steel 321 Screw Exporter in Malaysia |
| Stainless Steel 321 Screw Exporter in Saudi Arabia | Stainless Steel 321 Screw Exporter in Brazil | Stainless Steel 321 Screw Exporter in USA | Stainless Steel 321 Screw Exporter in Sri Lanka |
| Stainless Steel 321 Screw Exporter in Australia | Stainless Steel 321 Screw Exporter in Nigeria | Stainless Steel 321 Screw Exporter in 85+ countries | |
Manufacturer & Exporter of Washer in the Following Countries
| Country | Country | Country | Country | Country |
|---|---|---|---|---|
 Saudi Arabia |
 Kazakhstan |
 Zimbabwe |
 Netherlands |
 India |
 Afghanistan |
 Belgium |
 UAE |
 Israel |
 Europe |
 New Zealand |
 Mexico |
 Canada |
 Venezuela |
 United Kingdom |
 United States |
 South Africa |
 Malaysia |
 Poland |
 Germany |
 Singapore |
 Sri Lanka |
 Australia |
 Brazil |
 Ireland |
