Sinsun Hardware, established in 2006, is a leading manufacturer and global supplier of high-quality fasteners. As Northern China's largest producer of Self-Tapping Screws, we operate from a gigantic 30,000 sqm integrated facility that includes modern production zones, a 12,000 sqm smart warehouse (18,000+ pallet capacity), and multi-language customer support centres. Our yearly supply of over 8,500 containers consistently services key global markets such as the Middle East, Southeast Asia, South America, and Russia.
Our production prowess is driven by German-imported machinery, precision Taiwanese technology, and a dependable staff of trained specialists. We offer over 20,000 SKUs of nails, screws, wires, and rivets, each undergoing 12+ stringent quality checks to assure outstanding polish (Ra ≤ 0.4μm), corrosion resistance (1,000+ hours salt spray), dimensional accuracy (±0.02mm), high strength (1,000+ MPa), and consistent hardness (HRC 28-32).
In mechanical structures, the structural integrity of a bolted joint depends heavily on two critical components: the **Nut** and the **Washer**. Often overshadowed by the bolts themselves, these components perform the vital tasks of load distribution, thread matching, and preventing self-loosening under vibration. Sinsun Hardware's role as a premiere China Nuts and Washers Factory & Exporter is defined by our commitment to precision metallurgy, helping engineers avoid failures caused by hydrogen embrittlement, thread stripping, or galvanic corrosion.
The global industrial fasteners market is undergoing rapid evolution. Key drivers include the growth of utility-scale solar tracker systems, automated automotive plants, and heavy urban infrastructure. These critical fields require mechanical joints that can withstand decades of environmental exposure without maintenance. As global supply chains face volatility, international buyers are shifting focus from simple transaction-based sourcing to strategic partnerships with integrated manufacturers who control their raw material supply chains. By partnering with leading suppliers like Xingtai Steel and controlling the drawing process in-house, Sinsun ensures material purity that exceeds ASTM, DIN, and ISO standards.
Washers serve a greater purpose than simply protecting the joint's surface. In high-tensile structural bolting, washers distribute the clamp load over a wider area, preventing surface deformation of the joined materials. Sinsun's manufacturing catalog features flat, spring, lock, and custom tooth washers. Each variation is designed to manage tension loss under dynamic loads:
Increases bearing surface, spreading clamp forces to prevent embedding.
Provides constant tension to counter thermal contraction and expansion.
Prevents rotational loosening through physical bite and tensioning.
Designed for structural joints in wind turbines and bridges.
Nuts must match their mating bolts in strength class, pitch, and thread depth. When a fastener fails, it is often due to thread stripping in the nut rather than bolt breakage. A quality-made nut should distribute load evenly across all engaged threads. Sinsun utilizes advanced multi-station cold heading machinery to ensure consistent thread geometry and high dimensional accuracy (±0.02mm). By achieving a surface roughness of Ra ≤ 0.4μm, our nuts minimize friction coefficients during assembly, allowing for precise control of bolt preload during torque application.
For engine mountings, structural chassis assembly, and suspension systems. Our high-tensile nuts maintain clamping force under severe vibration, while high-corrosion-resistant coatings protect joints from road salt and moisture.
Outdoor solar tracker arrays require parts that can withstand long-term wind fatigue and weather exposure. We provide heavy-duty nuts and lock washers coated for 1,000+ hours of salt spray resistance (ASTM B117).
Large-scale steel frames rely on heavy-duty structural washers to distribute extreme loads. Our products support high shear loads and structural connections in commercial high-rises and transit systems.
Our Quality Management System operates across every phase of production. We source high-grade raw steel coils from XING TAI Steel and process them through in-house spheroidizing annealing and wire drawing. This ensures a consistent material structure and clean metal flow during subsequent cold forging.
Our fabrication facility features German multi-station cold heading machinery combined with Taiwanese tooling setups. This technological configuration enables precise shaping of hex flanges, square profiles, and custom dimensions. Following fabrication, four in-house heat treatment lines harden and temper the fasteners to achieve tensile strengths of 1,000+ MPa and hardness specs of HRC 28-32, without structural embrittlement.
Sinsun began with a singular focus in 2006: to build a factory dedicated to self-tapping screws. This foundational specialization established our core expertise from the ground up. It remains the unwavering commitment behind every screw we manufacture today.
The year 2012 marked a pivotal step for Sinsun with the establishment of our Export Department. From that point forward, our specialized self-tapping screws began reaching customers across the world, expanding our mission beyond borders.
In 2015, Sinsun expanded its control over quality by adding four spheroidizing furnaces for raw material processing and in-house wire drawing capabilities. This strategic upgrade moved our production beyond screw manufacturing, beginning with precise control from the raw material stage. It ensures superior consistency and performance in every piece screw we produce.
Our production capability was enhanced in 2018 with new German multi-station cold heading machines. Concurrently, we grew our product line to include a variety of drill tail screws. This dual development strengthened our specialized manufacturing foundation.
Sinsun's growth in 2021 was defined by two key metrics: reaching 36,000 tons in annual production and fulfilling international orders with over 1,100 export containers. This period underscored our capacity to deliver at scale to a global market.
To ensure timely delivery for our clients, we operate a 1,200-square-meter ready-stock warehouse as of 2023. This facility is dedicated to supporting efficient daily distribution and meeting your routine supply needs.
The addition of four heat treatment lines in 2025 significantly boosts our production capacity. This directly translates to greater consistency in product quality and stronger guarantees for on-schedule delivery, meeting your project needs with confidence.
The manufacturing floor of Sinsun is shifting from manual monitoring to data-driven control systems. Our technological roadmap focuses on three main development goals:
In our 12,000 sqm logistics center, we are implementing automated storage and retrieval systems (AS/RS). By matching our production schedules with automated warehousing systems, we ensure that popular product categories are kept in stock and ready to ship, helping to keep client project timelines on schedule.
Industrial demand is shifting away from traditional hexavalent chromium plating due to environmental regulations. In response, Sinsun has developed zinc flake, trivalent chromium, and organic seal coat technologies. These options provide over 1,000 hours of salt spray protection while complying with RoHS and REACH regulations.
To achieve high-level precision in multi-thousand-part orders, we have integrated optoelectronic sorting machines into our inspection lines. These machines screen products at high speeds, checking thread pitch, head concentricity, and dimension tolerances (down to ±0.02mm) to ensure high consistency across production runs.
