In modern heavy industries, mechanical integrity depends entirely on the micro-level reliability of fastening elements. Stainless steel bolt and nut assemblies are the silent enablers of the world's most demanding engineering projects.
The global industrial fastener market is currently transitioning from basic carbon steel hardware to high-strength, alloyed, and grade-specific stainless steel fastening solutions. Factors driving this transition include the rapid expansion of offshore wind turbines, marine transport infrastructure, and high-temperature chemical processing plants.
These environments require materials that can resist electrochemical oxidation (rusting) and mechanical fatigue over long life cycles. Using standard fasteners in highly corrosive marine or industrial settings can lead to catastrophic stress corrosion cracking (SCC) and thread galling. This shows why selecting the correct mechanical alloy—such as Austenitic grades (A2-70, A4-80), Martensitic grades, or Duplex stainless steels—is critical for structural integrity.
Sinsun Hardware remains at the forefront of fastening technology by integrating advanced manufacturing technologies with strict raw material processing protocols.
Our manufacturing starts with premium grade wire rods from XING TAI Steel. We process these materials using in-house spheroidizing annealing and wire drawing to guarantee consistent chemical distribution and eliminate internal stresses before cold heading.
We combine multi-station cold heading machinery imported from Germany with Taiwanese precision production technologies. This allows us to achieve precise thread geometry, uniform pitch, and consistent dimensions (±0.02mm tolerances) across production runs.
With four dedicated heat treatment lines added in 2025, we exercise complete control over tempering and hardening phases. This helps prevent internal micro-cracks while delivering tensile strengths exceeding 1,000+ MPa and core hardness parameters of HRC 28-32.
Our history shows our continuous commitment to quality, capacity expansions, and technical upgrades since 2006.
Sinsun was founded with a clear objective: to build a modern, high-precision production base for self-tapping screws and core structural fasteners in Northern China.
We established our dedicated export department, allowing Sinsun's precision fasteners to enter critical construction and industrial markets across Europe, Russia, South America, and the Middle East.
We added four spheroidizing annealing furnaces and built our wire drawing workshop. This allowed us to control material properties from the raw wire stage.
We upgraded our production line with German-engineered multi-station cold heading machines, adding drill tail screws and high-end stainless bolts to our catalog.
We hit an annual production capacity of 36,000 tons, shipping more than 1,100 export containers globally while maintaining strict quality metrics.
We established a 12,000 m² smart warehouse with an 18,000+ pallet capacity, including a 1,200 m² ready-stock area to support short lead times for global clients.
We integrated four new advanced heat treatment lines, enhancing control over fastener hardening, core reliability, and delivery times.
ODM stainless steel fasteners must perform reliably under high static loads, cyclic stress, and chemical exposure. Below is Sinsun's technical roadmap showing how we maintain quality control from raw material to finished product.
We source steel from XING TAI Steel. We utilize high-nickel A2/A4 grade wire rods to prevent structural rust and maintain stability across temperature shifts.
We perform gas-fired spheroidized annealing and precision drawing. This allows us to achieve precise wire diameters and prepare the microstructure for deformation-free cold heading.
Using German and Taiwanese multi-station headers, we roll threads to ensure consistent profiles and flat surfaces (roughness Ra ≤ 0.4µm).
Every batch goes through 12+ inspection points. These check dimensions (±0.02mm), salt spray resistance (1,000+ hrs), and tensile strength (1,000+ MPa).
| Alloy Grade | Chemical Composition Key Elements | Tensile Strength (MPa) | Yield Strength (Min, MPa) | Primary Industrial Applications |
|---|---|---|---|---|
| Austenitic AISI 304 (A2-70) | 18% Cr, 8% Ni | 700 - 850 | 450 | General industrial environments, construction cladding, food processing plants. |
| Austenitic AISI 316 (A4-80) | 16% Cr, 10% Ni, 2% Mo | 800 - 1000 | 600 | Marine infrastructure, offshore oil and gas rigs, desalination installations. |
| Duplex Stainless Steel (2205) | 22% Cr, 5% Ni, 3% Mo, 0.18% N | 900 - 1100 | 800 | Chemical processing plants, subsea pipelines, wastewater treatment tanks. |
| Martensitic AISI 410 | 12% Cr (Hardened) | 1000+ | 750 | High-hardness self-drilling screws, structural metal roofing sheets. |
Different industries require specialized engineering solutions. Sinsun works closely with engineering procurement teams to design and supply custom fasteners for specific applications.
Saltwater exposure accelerates crevice corrosion in standard fasteners. Our ODM A4-80 (AISI 316) stainless steel bolt-nut sets contain molybdenum, which offers excellent resistance to chloride-induced pitting. These products are widely used in shipbuilding, wharf construction, offshore solar setups, and desalination pump assemblies.
Renewable energy projects require structural fasteners that can withstand high wind loads and outdoor exposure for over 25 years. Sinsun's custom locking nuts and structural lag bolts maintain constant clamping force, preventing loose joints caused by thermal expansion and wind vibration.
Refineries operate under intense heat, high pressures, and corrosive gases. Our duplex stainless steel fasteners are designed to maintain their tensile properties and resist stress corrosion cracking under these high-temperature, high-pressure conditions.
Automated manufacturing systems and precision robotics require tight dimensional tolerances. Our Taiwanese-engineered cold heading processes produce bolts with tolerances down to ±0.02mm, ensuring clean thread engagement and minimizing machine downtime.
Get answers to common technical, manufacturing, and shipping questions about ODM stainless steel fasteners.
Sinsun runs a 30,000 m² production facility with a 12,000 m² smart warehouse. This scale allows us to manage manufacturing in-house and ensure stable product supply.
Our quality control starts at the source. Sourcing raw wire from XING TAI Steel allows us to control chemical makeup, drawing, and spheroidizing. We then form, thread-roll, and heat-treat the products using our in-house systems.
By keeping these steps under one roof, we eliminate extra supplier markups and reduce transit delays. This means we can provide cost-effective ODM/OEM services and ship products on schedule.
We work with distributors, building contractors, and supply chain managers in the Middle East, Southeast Asia, South America, and Europe. Our team helps clients select materials, plan shipping, and customize packaging to meet local requirements.
Contact our engineering and sales teams to request design support, material certifications, or a quote for your project.
