Super Austenitic Stainless Steel Din912 2205 Hex Socket Bolt Allen Bolt Hex Socket Cap Screw

This product is a 2205 duplex stainless steel hexagonal round head screw (commonly known as cup head hexagonal bolt or round head hexagonal screw in the industry), which is a high-end fastener specially designed for extreme working conditions such as high corrosion, high load, and high salt spray. The product uses 2205 duplex stainless steel (national standard grade 022Cr23Ni5Mo3N, ASTM A182 F51) as the core base material. It is manufactured through multiple processes such as precision cold heading, rolling threads, solution acid washing and passivation, which combines the excellent corrosion resistance of austenitic stainless steel with the high strength and stress corrosion resistance of ferritic stainless steel. Its resistance to pitting and crevice corrosion is far superior to 304/316 stainless steel. It is equipped with a standard hexagonal round head + knurled anti-slip structure, providing an ultra-stable and long-lasting safe connection and fastening solution for high-end fields such as marine engineering, chemical industry, seawater desalination, and papermaking.

2205 dual-phase stainless steel exclusive material, super corrosion resistance + high strength dual excellence

2205 dual-phase stainless steel has an austenite + ferrite dual-phase structure, with PREN (corrosion resistance equivalent) ≥ 35. Its resistance to pitting, crevice corrosion, and stress corrosion is more than twice that of 316 stainless steel. It can work stably in extreme corrosive environments such as high salt spray, high chloride ions, and strong acids and alkalis; at the same time, its tensile strength ≥ 655 MPa, yield strength ≥ 450 MPa, which is twice that of ordinary 304/316 stainless steel. It can withstand extremely high loads, perfectly solving the problems of easy corrosion and deformation of ordinary stainless steel in high-corrosion and heavy-load scenarios, and is non-magnetic, meeting the standards for high-end industrial use.

Round head with embossing + internal hexagon structure, excellent anti-slip installation

Strictly following the international standard GB/T 70.1 (ISO 4762, DIN 912), the round head has an embossed anti-slip design. When tightened, it increases friction to avoid slipping, suitable for precise control of manual/electric tools; the internal hexagon drive structure can achieve embedded assembly, not occupying additional installation space, and perfectly adapting to narrow spaces and automated batch assembly scenarios.

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

Using a fully automatic rolled thread process, the thread accuracy reaches grade 6g, with full tooth shape, no burrs, no slippage. It has a tight engagement with the nut/threads, uniform force, excellent anti-loosening and shock resistance performance, capable of withstanding long-term vibration and impact loads, avoiding the risk of loosening and falling off; 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.

Solution annealing and passivation process, dual excellence in performance and appearance

The product undergoes 1050-1100℃ solution heat treatment + acid washing passivation treatment, eliminating internal stress, optimizing the ratio of dual-phase structure, maximizing the anti-corrosion performance and mechanical properties; the surface has high smoothness, no oxide scale, no scratches, a shiny appearance, and enhances corrosion resistance, reduces stress concentration, and extends product service life.

Full specification coverage, customized service

Covering the full range of screw specifications from M3 to M24, with lengths from 6mm to 200mm for all categories. At the same time, it supports non-standard customization, according to customer requirements, customizing special lengths, special threads, and special head types of internal hexagon screws, meeting the personalized fastening needs of high-end equipment and special working conditions.

Core advantages: The yield strength can reach 400-550 MPa, which is twice that of ordinary austenitic stainless steel. During design, it can significantly reduce the material usage. In environments containing chloride ions, it exhibits outstanding resistance to pitting corrosion, crevice corrosion and stress corrosion.

Industrial equipment manufacturing: Assembly and fastening of core components such as automated production lines, machine tools, hydraulic equipment, motors, pumps and valves

3C electronics and precision instruments: Precision connections for small components such as mobile phones, computers, precision instruments, optical equipment, medical devices, etc.

Food and medical industries: Tightening for food processing machinery, catering equipment, medical equipment, water purification equipment, etc. in hygienic scenarios

Construction and hardware decoration: Windows and doors, furniture, hardware accessories, bathroom equipment, curtain wall structures, etc. for civilian and engineering scenarios

Outdoor and shipbuilding fields: Outdoor facilities, ship accessories, photovoltaic supports, communication base stations, etc. in humid and highly corrosive environments

Automobile and rail transportation: Vehicle interiors, components, rail transportation equipment, etc. for lightweight and rust prevention scenarios

Protective packaging: The product is packaged in individual sealed bags + moisture-proof and rust-proof desiccant + high-strength corrugated cardboard boxes. For large-sized products, shock-absorbing pearl cotton is also provided to prevent scratches, abrasions and rusting during transportation, ensuring the product is delivered in good condition.

Transportation plan: Various transportation methods such as express delivery, logistics, and full vehicle shipment are supported. In domestic regular areas, the products can be delivered within 3-5 days. For remote areas, customized expedited transportation can be arranged. Overseas orders support sea transportation and air transportation. The entire logistics process is trackable.

Warehouse management: Each box of products is labeled with specifications, models, quantities, materials, and execution standards, facilitating customers' counting, storage and management. It supports whole-box and zero-unpacking purchases, and is flexible to adapt to customer needs.

Moisture-proof and rust-proof: Special rust-proof desiccant is added inside the packaging, suitable for long-distance transportation and humid environments, ensuring that the products are free from rust and damage upon arrival at the warehouse, and can be used immediately upon opening.