2205 Super Duplex Stainless Steel DIN 912 Subsea Marine Bolt Pren 40+ Deep Sea Resistant M24 Hex Socket Cap Screw Allen Bolt Head Machine Screw

Product Description

Product Description

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This series of products is specially designed for extreme working conditions. They adopt advanced metallurgical processes and precise manufacturing techniques, covering four categories: duplex stainless steel, super austenitic stainless steel, heat-resistant alloys, and precipitation-hardening stainless steel. The products strictly comply with international mainstream standards such as GB, DIN, 150, J1S, ANSI/ASME, etc., and are widely used in high-end equipment manufacturing fields such as petrochemicals, marine engineering, nuclear power equipment, rail transportation, and energy and power.

Process Name	Characteristic	Range of application
Dacromet	No hydrogen embrittlement, resistant to salt fog for 1000 hours+	high strength fastener
Passivation	Forming chromium oxide protective film	Stainless steel products
Ultrasonic cleaning	High cleanliness, no residue	Food and medical grade
Boiling oil	Short-term rust prevention	One unit storage
Polishing wax	Long-term rust prevention	Ocean shipping for export

Specification

Product Type	Standard	Specification Range	Length range
Hex socket full thread	DIN912	AM5-M16	10-150MM
Hex socket thick rod	DIN912	M8-M16	Customized according to the order
External hex bolt full thread	DIN933/GB5783	M5-M42	10-420mm
External hex thick rod	DIN931/GB5783	1/4-7/8"	Customized according to the order
American external hex	ANSI B18.2.1	M6-M45	Customized according to the order
Equal-length double-ended stud	GB901	M4-M45	Full specification
Tapered rod / Tapered bar	DIN975/DIN976	M4-M45	all THREADED ROD

2205 duplex stainless stel

The main feature of 2205 duplex stainless stel is that its yield stength can reach 400-55o MPe,whichis twice that of ordinary austenitic stainles steel. This characteristenables designers to reduce the weight when designing product, thus saving materials, This alloy has a more favorable price advantage compared to 316 and 317, andan lower the manufacturing cost ofequipment. In terms of corrosion resistance, especialy under harsh medlum conditions (such as seawater with high chiorid ionontent, the ant point corosion,crevice corosion, stress corosion and corrosion fatigue performance ofduplex stainless stel is signifcanty better than that ofordnaraustenitic stainless steel, and can rival high-alloy austenitic stainless steel.

Application Scenario

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Petrochemical industry:
The equipment such as oil refining units, chemical reactors, conveying pipelines, and heat exchangers are tightly connected. 2205 and 2507 duplex steel perform exceptionally well in media containing hydrogen sulfide and chloride ions; 904L is suitable for non-oxidizing acid environments such as sulfuric acid and phosphoric acid.

Ocean Engineering:
Offshore oil platforms, seawater desalination facilities, ship equipment, etc. 2507 super duplex steel has excellent resistance to pitting and crevice corrosion in seawater environments and is the preferred material for marine engineering fasteners.
Nuclear power energy:
Nuclear island equipment, conventional island equipment, flue gas desulfurization devices, etc. 660 precipitation hardening steel is used for high-temperature and high-pressure components; 321 stainless steel is used for pipeline systems.

Rail traffic:
High-speed rail, subway vehicle and track infrastructure construction. The products possess high strength, fatigue resistance, vibration resistance and other characteristics, ensuring safe operation.
Environmental protection equipment:
Equipment for desulfurization and denitrification of flue gas, sewage treatment, and waste incineration. 317L and 904L have excellent corrosion resistance in environments with chlorine-containing exhaust gas and acidic wastewater.

Main Product

Standard parts and non-standard parts

We are a specialized manufacturer and exporter of both standard and custom-engineered hardware fasteners, serving global markets with precision-engineered solutions. Our standard product portfolio encompasses a comprehensive range of stainless steel, carbon steel, and alloy fasteners—including bolts, nuts, screws, washers, and pins—compliant with international standards such as DIN, ISO, ANSI, and JIS, ensuring seamless integration into your existing supply chains. Simultaneously, our non-standard customization capabilities leverage advanced CNC turning, milling, and cold forging technologies to transform your unique designs into high-precision components, from complex geometries to specialized material specifications. With certifications including ISO 9001 and IATF 16949, we serve diverse industries spanning oil and gas, marine engineering, renewable energy, medical devices, and precision instrumentation. Our integrated manufacturing facility enables us to deliver everything from rapid prototyping and small-batch production to high-volume manufacturing, with full material traceability, dimensional inspection reports, and flexible logistics solutions including FOB, CIF, and DDP delivery terms. Whether you require off-the-shelf standard fasteners or bespoke engineered components, we provide end-to-end technical support—from design for manufacturability (DFM) consultation to final quality validation—ensuring your projects receive hardware solutions that meet exacting specifications, competitive lead times, and consistent quality standards.

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