Sinsun Hardware, established in 2006, is a leading manufacturer and global supplier of high-quality fasteners and sealing integrations. 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, rivets, and matching elastomeric sealing washers, 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).
Analyzing elastomeric performance curves, custom vulcanization profiles, and the shift toward intelligent sealing assemblies.
The core of rubber sealing performance lies in polymer selection. We compound EPDM (Ethylene Propylene Diene Monomer), Neoprene, Silicone, and Viton (FKM) to resist ozone aging, thermal degradation, and chemical exposure. Modern applications require precise vulcanization to guarantee Shore A hardness tolerances within ±5 degrees, optimized compression sets, and absolute zero-leak interface compliance.
By bonding elastomeric profiles directly to metallic substrates, co-molded rubber-to-metal sealing washers completely eliminate installation misalignment. This process improves galvanic insulation in metal-to-metal joints, preventing structural failures. Our current technology roadmap focuses on developing micro-embossed rubber surfaces that seal effectively under lower clamping forces, reducing wear on hardware.
Looking ahead, Sinsun is pioneering bio-based elastomers and recycled rubber components that match the tensile performance of virgin compounds. Additionally, we are researching "smart seals" featuring conductive carbon black additives. These components track pressure variations and electrical impedance, paving the way for real-time diagnostic capabilities in industrial applications.
Custom ODM solutions engineered for harsh operating environments, heavy machinery, and long-term infrastructural installations.
Roofing projects require seals that can withstand UV exposure, acid rain, and temperature swings. Our EPDM-bonded washers seal roof penetrations to prevent leaks and isolate metal panels, preventing galvanic corrosion over decades of service.
Our sealing washers are designed to resist engine oils, hydraulic fluids, and glycols. With low compression set properties, they maintain tight seals on drain plugs and fluid lines despite constant vibration and thermal cycling.
Utility-scale solar arrays face harsh wind loads and constant sunlight. Our high-density EPDM and silicone washers protect mounting brackets from moisture and wind damage, helping solar structures reach their 25-year service life.
Handling hydrocarbons requires specialized materials. We engineer fluoropolymer and HNBR washers to resist explosive decompression, harsh chemicals, and high pressures, preventing leakage and fugitive emissions in refinery environments.
At SINSUN, our quality control begins at the source. We start with premium raw materials from XING TAI Steel, then perform in-house spheroidizing annealing and precision wire drawing in our own plant. This end-to-end control, supported by our advanced drawing machines and gas-fired furnaces, ensures superior microstructure, consistency, and performance in every fastener and sealing assembly we produce.
By combining German-engineered multi-station cold heading machines with precision Taiwanese production technology, our specialized processes ensure every fastener is manufactured with utmost accuracy. The addition of four new heat treatment lines in 2025 significantly boosts our production capacity, guaranteeing consistent hardness and on-time deliveries.
SINSUN offers flexible OEM and ODM packaging tailored to your needs. With a professional packaging team and a 12,000 m² warehouse, we provide custom packaging, 3D design previews, and full logistics support to deliver a seamless, worry-free experience from production to shipment.
Tracing our evolution since 2006 from a specialized production workshop into an international manufacturing powerhouse.
Sinsun began with a singular focus in 2006: to build a factory dedicated to self-tapping screws and core fastener assemblies. This foundational specialization established our core expertise from the ground up.
The year 2012 marked a pivotal step for Sinsun with the establishment of our Export Department, taking our specialized fastening solutions to international distributors and infrastructure projects worldwide.
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 allowed us to monitor quality starting directly from the raw wire stage.
Our production capability was enhanced in 2018 with new German multi-station cold heading machines. Concurrently, we grew our product line to include specialized drill tail screws and integrated rubber seals.
Sinsun's growth in 2021 was defined by reaching 36,000 tons in annual production and fulfilling international orders with over 1,100 export containers, proving our capacity to support global procurement requirements.
To ensure rapid deliveries, we expanded our storage capacities into a smart warehousing system. We maintain a large ready-stock volume to protect clients against global supply chain disruptions.
The addition of four new heat treatment lines in 2025 significantly boosts our production capacity. This translates to greater consistency in product hardness and stronger guarantees for on-schedule project delivery.
Aligning with international engineering, environmental, and regional logistics regulations for worry-free trade.
All Sinsun rubber components and assemblies undergo thorough verification to comply with RoHS (Restriction of Hazardous Substances) and REACH directives. When required, we provide FDA-compliant formulations for food-grade, pharmaceutical, or potable water applications, backed by full material traceability reports (MTRs).
We streamline international trade by handling the customs documentation needed for key markets, including CE declarations for Europe, SASO clearances for the Middle East, and GOST certifications for Russia. Our sales team offers end-to-end logistics solutions, working under Incoterms like DDP, CIF, and FOB.
Effective global supply chain management requires clear communication. Sinsun maintains multi-lingual technical customer service centers to discuss custom material drawings, product redesigns, and load testing data directly with your project managers.
In-depth insights into the manufacturing, performance testing, and applications of rubber sealing washers.
Every month, we welcome international buyers for on-site factory audits, demonstrating our production capabilities and transparent quality controls.
