Din912 Stainless Steel 321 Hex Socket Bolt Allen Bolt Screw Hex Socket Cap Screw

This product is a 321 stainless steel internal hexagonal cylindrical head screw (commonly known as cup head internal hexagonal bolt or cylindrical head internal hexagonal screw). It is a high-performance fastener specially designed for harsh working conditions such as high temperature, corrosion, and high vibration. The product is made of 321 austenitic stainless steel (national standard grade 1Cr18Ni9Ti) as the core material. It is formed through precise cold heading, rolled threads, and solution hardening processes. It combines the excellent corrosion resistance of 304 stainless steel with the superior high-temperature resistance and intergranular corrosion resistance brought by titanium elements. With a standard internal hexagonal cylindrical head structure, it can be adapted to narrow spaces, embedded assembly and other scenarios, providing stable, long-lasting and safe connection and fastening solutions for high-end fields such as aerospace, chemical industry, boilers, and high-temperature equipment.

Comparison between 321 and other materials:

321 stainless steel exclusive material, superior in both high temperature resistance and corrosion resistance

Using national standard 321 austenitic stainless steel (1Cr18Ni9Ti), which is an addition of titanium element on the basis of 304 stainless steel, it can work stably in a 400-900℃ high-temperature environment, completely solving the pain points of intergranular corrosion and strength attenuation of ordinary stainless steel at high temperatures; at the same time, it has excellent acid and alkali resistance, salt spray resistance, and anti-corrosion performance, and can be used in complex environments such as chemical industry, coastal areas, and humid areas for long-term use, without magnetism, toxicity, or harm, and meets the standards for high-end industrial use.

Standard cylindrical head internal hexagonal structure, convenient for installation and universal

Strictly following GB/T 70.1 (ISO 4762, DIN 912) international standards for design, the cylindrical head + internal hexagonal drive structure, combined with a universal internal hexagonal wrench, can be quickly installed, achieving headless embedded assembly, without occupying additional installation space, perfectly adapting to narrow spaces, automated batch assembly, and manual installation scenarios.

High-precision rolling threads, tight engagement, anti-loosening, and shock resistance

Using a fully automatic rolling thread process, with a thread precision of 6g level, the tooth shape is full, without burrs or slippage, and it meshes tightly with the nut / threaded hole, with uniform force, excellent anti-loosening and shock resistance performance, capable of withstanding long-term vibration and impact loads, avoiding the risk of loosening and detachment, ensuring the connection is stable for a long time; the rolling process also enhances the surface hardness and fatigue resistance of the product, with a service life far exceeding those of cut processing screws.

Solid solution and passivation process, dual excellence in performance and appearance

The product undergoes solid solution heat treatment + rust prevention treatment, with uniform metallographic structure, elimination of internal stress, and improvement of intergranular corrosion resistance and mechanical properties; the surface has high smoothness, no scratches, no oxide scale, a bright appearance, and enhances corrosion resistance, reduces stress concentration, and extends the product service life.

Full specification coverage, customized service

Covering the full range of M3-M20 threaded specifications, with lengths from 6mm to 200mm for all categories, and also supporting non-standard customization, according to customer requirements, special lengths, special threads, and special head types of internal hexagonal screws can be customized to meet the personalized fastening needs of high-end equipment and special working conditions.

Aerospace field: High-temperature fastening for aircraft engines, spacecraft components, and aviation equipment, suitable for high load, high temperature, and corrosive environments

Chemical and energy field: Fastening for chemical reaction vessels, boilers, heat exchangers, nuclear power equipment, and high-temperature pipelines, suitable for high-temperature and highly corrosive working conditions

Industrial furnaces and heat treatment field: Structural fastening for industrial furnaces, heat treatment equipment, and kilns, suitable for long-term high-temperature working environments

Automotive and power field: Fastening for high-temperature components of automotive engines, turbochargers, and exhaust systems, suitable for high-frequency vibration and high-temperature conditions

Ship and marine engineering field: Fastening for high-temperature equipment on ships, offshore platforms, and coastal chemical facilities, suitable for humid, high salt spray, and high-temperature environments

Food and medical high-temperature equipment: Fastening for high-temperature sterilization equipment, food baking equipment, and medical high-temperature instruments, in line with hygiene-level usage standards

Q1: Can I install your anchor bolts in pre-existing concrete structures?

A: In many cases, it is possible to install our anchor bolts in pre-existing concrete structures. However, the process may require special techniques such as drilling and using chemical anchors or expansion anchors in some cases. It is important to assess the condition of the existing concrete and consult with a professional or our technical team to determine the best installation method.

Q2: How do I select the right size of anchor bolt for my project?

A: Selecting the right size of anchor bolt depends on several factors, including the type of structure, the load it will bear, and the characteristics of the base material. You should consider the tensile and shear forces that the bolt will be subjected to and refer to our product specifications and engineering guidelines. Our sales team can also assist you in choosing the appropriate size based on your project requirements.

Q3: What is the difference between a chemical anchor bolt and a mechanical anchor bolt?

A: A chemical anchor bolt uses a chemical adhesive to bond the bolt to the base material, providing a strong connection. It is often used in situations where a high level of precision and load-bearing capacity is required. A mechanical anchor bolt, on the other hand, relies on mechanical means such as expansion or friction to secure the bolt in place. The choice between the two depends on factors such as the type of base material, the application requirements, and the environmental conditions.

Q4: Do your anchor bolts come with any warranty?

A: Yes, we offer a warranty on our anchor bolts. The specific terms and conditions of the warranty may vary depending on the product and the application. Please refer to our warranty policy or contact our customer service team for more information.