Stainless Steel 321 Hex Nut Duplex Stainless Steel Din934 Hex Head Nut Hex Thin Nut Plain Hex Nut

This product is a 321 stainless steel hexagonal nut (also known as 1Cr18Ni9Ti stainless steel hexagonal head cap, high-temperature resistant locking nut). It is a high-performance industrial fastener specially designed for harsh working conditions such as medium-high temperature, corrosion, and high vibration. The product is made with 321 austenitic stainless steel (national standard designation 1Cr18Ni9Ti, ASTM A193 B6T) as the core base material. It is formed through precise cold heading, tapping, solution heat treatment, and passivation anti-rust processes. On the basis of 304 stainless steel, titanium elements are added to completely solve the intergranular corrosion problem of ordinary stainless steel at temperatures ranging from 400 to 900 degrees Celsius. It has excellent corrosion resistance and outstanding high-temperature resistance, and is equipped with a standard external hexagonal structure. It provides stable, long-lasting, and safe connection and fastening solutions for fields such as boilers, chemical industries, automotive exhaust, aerospace, etc.

321 stainless steel exclusive material, with superior heat resistance and intergranular corrosion resistance

321 stainless steel is a titanium-containing austenitic stainless steel. The addition of titanium elements fundamentally inhibits intergranular corrosion, enabling long-term stable operation at temperatures around 800℃. Its anti-oxidation and anti-warping performance far exceeds that of 304/316 stainless steel. It also possesses excellent acid and alkali resistance, salt fog resistance, and anti-corrosion properties, allowing for long-term use in complex environments such as chemical plants, coastal areas, and humid conditions. It is non-magnetic, non-toxic, and harmless, meeting the standards for high-end industrial use.

Standard hexagonal structure, convenient and efficient installation

Designed strictly in accordance with the international standards GB/T 6170 (ISO 4032, DIN 934), the standard hexagonal shape is compatible with universal wrenches, sockets, and power tools. No special installation tools are required, and it can be directly replaced with ordinary nuts of the same specification, perfectly adapting to manual and automated batch assembly, with high installation efficiency and suitable for all scenarios of fastening needs.

High-precision tapping process, tight engagement and uniform force

Using a fully automatic precision tapping process, the thread accuracy reaches 6H grade. The tooth shape is full, without burrs or slippage, and it meshes tightly with the same specification 321 stainless steel bolts, with uniform force, excellent anti-loosening and anti-vibration performance, capable of withstanding long-term vibration and impact loads, avoiding the risk of loosening and detachment, and ensuring the long-term stability of the connection.

Solution annealing process, dual improvement of performance and lifespan

The product undergoes 1000-1100℃ solution heat treatment + rust prevention treatment, eliminating internal stress, optimizing the metallographic structure, and maximizing the anti-intergranular corrosion, high-temperature resistance, and mechanical properties. The surface has high smoothness, no oxide layer, no scratches, strong appearance texture, and enhances corrosion resistance, reduces stress concentration, and extends the product lifespan.

Full specification coverage, customized service

Covering the full range of M3-M30 thread specifications, and also supporting non-standard customization. Customized special threads, fine teeth, thickened hexagonal nuts can be provided according to customer requirements, meeting the personalized fastening needs of high-temperature equipment and special working conditions.

The owner of the car modification shop commented: "The 321 stainless steel hexagonal nuts used for modifying the turbochargers and exhaust systems of the cars are resistant to high temperatures and rust. They are suitable for the high-temperature and vibration conditions of the vehicles. When installed according to the standard torque, they have run for several thousand kilometers on the racetrack without any loosening. The customers are all very satisfied."

The equipment engineer of the chemical plant commented: "All the medium-high temperature fastening parts of chemical reactors and boilers use this type of nuts. The 321 stainless steel is resistant to intergranular corrosion and acid-base corrosion. It has not failed after three years of use. The thread accuracy is high, the installation is convenient, and many have been repurchased."

The purchasing officer of the aerospace parts factory commented: "This 321 stainless steel hexagonal nut used for the components of the aircraft engines has an unparalleled high-temperature performance. It does not deform or corrode even under 800℃ conditions for long-term use. The thread accuracy is high, the installation is convenient, and the connection is stable. The quality fully meets the requirements of the aerospace grade."

The purchasing officer of the industrial furnace manufacturing enterprise commented: "All the structural fastening parts of industrial furnaces and heat treatment equipment use this type of nuts. They are resistant to high temperatures and have sufficient strength, perfectly adapting to the strict working conditions of the furnace bodies. This significantly reduces the maintenance costs in the future. The quality is extremely reliable."

Automotive and Power Sector: Fastening of high-temperature components for automotive engines, turbochargers, exhaust systems, and racing car modifications, suitable for high-frequency vibration and high-temperature conditions

Chemical and Energy Sector: Fastening of chemical reaction vessels, boilers, heat exchangers, nuclear power equipment, and high-temperature pipelines, suitable for medium-high temperature and highly corrosive conditions

Aerospace Sector: High-temperature fastening for aircraft engines, spacecraft components, and aviation equipment, suitable for high loads, high temperatures, and corrosive environments

Industrial Furnaces and Heat Treatment Sector: Structural fastening of industrial furnaces, heat treatment equipment, and kilns, suitable for long-term medium-high temperature working conditions

Maritime and Ocean Engineering Sector: Fastening of high-temperature equipment for ships and coastal chemical facilities, suitable for humid, high-salt spray, and high-temperature environments

Food and Medical High-Temperature Equipment Sector: Fastening of high-temperature sterilization equipment and food baking equipment, in line with hygiene-level usage standards