Explore our foundational range of heavy-duty industrial fasteners exported globally to over 50 countries.
The largest self tapping screw production base in northern China
Sinsun Hardware, established in 2006, is a leading manufacturer and global supplier of high-quality fasteners. Operating from a massive 30,000 square meter integrated facility, we run modern production zones alongside a 12,000 square meter smart warehouse containing an 18,000+ pallet capacity. Over the years, we have scaled our delivery capacity to supply more than 8,500 containers annually to major markets worldwide, including South America, the Middle East, Southeast Asia, and Russia.
Our manufacturing precision is driven by German-imported multi-station cold heading machinery and Taiwanese production technology. Our deep product portfolio spans over 20,000 SKUs. Our components undergo 12+ stringent quality control tests to guarantee optimal mechanical parameters: surface finish values (Ra ≤ 0.4μm), dimensional tolerances (±0.02mm), high tensile strength (1,000+ MPa), core hardness (HRC 28-32), and corrosion resistance exceeding 1,000 hours in salt spray testing.
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A continuous path of engineering excellence and industrial scaling since 2006.
Sinsun was founded with a primary specialization in high-volume self-tapping screws, building our technical foundation.
Established the Export Department to distribute precision fastening components globally across key trade channels.
Added four gas-fired spheroidizing annealing furnaces and internal wire drawing lines to control incoming material microstructure.
Deployed high-speed German multi-station cold heading machinery to support drill tail and complex washer assemblies.
Reached 36,000 tons of annual fastener production and dispatched 1,100+ export containers overseas.
Operated 1,200 square meters of dedicated stock reserves to accommodate urgent custom delivery requirements.
Integrated four continuous-mesh belt heat treatment lines to maintain batch-to-batch metallurgical control.
Our quality control starts at the source, processing premium steel in-house to achieve reliable mechanical properties.
We source structural-grade carbon and alloy steel wires exclusively from XING TAI Steel, ensuring batch uniformity.
Gas-fired protective atmosphere furnaces adjust the steel's microstructure, eliminating internal stress before drawing.
High-speed tooling cuts, forms, and stamps components with precise outer and inner diameter tolerances.
Advancing metallurgical research and mechanical design to support high-stress structural joints.
Spring lock washers (helical split washers) serve as a standard anti-loosening design, providing a constant spring force that maintains tension in bolted assemblies. Under dynamic loads, bolted joints experience transverse vibration and micro-slip. Sinsun's engineering team is developing designs to optimize split angle geometries, increase resilience, and prevent thread slippage.
Our technical roadmap focuses on the transition toward ultra-high-strength steel alloys and corrosion-resistant surface coatings. Traditional carbon steel spring washers can face hydrogen embrittlement when acid-pickled and zinc-electroplated. To address this, Sinsun uses mechanical zinc plating and zinc flake coatings (such as Geomet and Dacromet), which prevent hydrogen absorption while providing over 1,000 hours of salt spray protection.
We are also optimizing the trapezoidal cross-section of spring lock washers. Using finite element analysis (FEA), our research department simulates the deflection-to-load characteristics of washers under varying clamp forces. This ensures they achieve full compression without cracking, maintaining tension under high-vibration conditions.
Simulated load distribution across split-ring edges to maximize bite tension into contact faces.
How we supply custom spring lock washers configured to meet the specific requirements of major global industries.
Designed to withstand thermal cycling and high vibrations in drivetrains, engine mounts, and suspension setups.
Corrosion-resistant lock washers protect mechanical connections in wind turbine nacelles and solar tracking arrays.
Heavy-duty structural spring washers designed to DIN 127 and ASME standards for steel framework, railways, and bridges.
We ensure international compliance across European, American, and Asian engineering standards.
For global procurement managers, component standard compliance is a key requirement. Sinsun's engineering division manufactures spring lock washers to meet leading global standards, including DIN 127 (A/B), DIN 7980 (for socket head cap screws), ASME B18.21.1, and JIS B 1251.
We verify these standards with precise quality documentation, providing material test reports (MTR), heat treatment certification, and plating thickness measurements. Our QA laboratory runs regularly calibrated testing equipment, including digital hardness testers, salt spray chambers, and torque wrench testers, ensuring all parts perform reliably under pressure.
Combining vertical integration, automated manufacturing, and smart warehousing to ensure reliable global delivery.
By keeping wire annealing, cold drawing, stamping, heat treatment, and packaging within our facility, we reduce external supply chain risks and lower margins.
Our 12,000 square meter smart warehouse holds over 18,000 pallets. Computerized inventory tracking ensures fast dispatch for high-volume orders.
With an annual output of 36,000 tons, we maintain consistent production schedules even during seasonal fluctuations or high raw material demand.
How we streamline the purchasing process for international buyers and engineering firms.
We support custom packaging requirements for distributors, retailers, and industrial assembly lines. Sinsun offers custom OEM box designs, barcode printing, and industrial-grade bulk packaging to prevent shipping damage.
Our design team can provide 3D mockups of packaging layouts prior to mass production, helping to streamline import clearance and distribution handling.
We welcome third-party inspections (such as SGS, Bureau Veritas, or TUV) before shipment. We provide full access to our internal testing facilities to ensure our products meet your specifications.
Additionally, our logistics team assists with customs clearance, shipping documentation, and freight forwarding to ensure smooth door-to-door delivery.
Answers to common technical and logistical questions about spring lock washers.
Explore our wider range of industrial fasteners, designed for high-stress and demanding load applications.
