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Integrated Production Facility
Containers Yearly Capacity
Available SKUs In Inventory
Smart Warehouse (18k Pallets)
In modern structural engineering and manufacturing, mechanical failure at connection points is often attributed to localized stress concentration. Thick Fender Washers play a crucial role in mitigating this vulnerability. Unlike standard flat washers, fender washers feature a significantly larger outer diameter (OD) relative to their inner diameter (ID). The addition of heavy-duty thickness (typically ranging from 2.0mm to 6.0mm or custom gauges) drastically increases the section modulus, resisting bending under high torque settings.
Globally, industries such as automotive assembly, marine infrastructure, timber construction, and aerospace require heavy-gauge washers to distribute clamping forces over expansive areas. This prevents the bolt head or nut from crushing or pulling through soft substrate materials like sheet metal, fiberglass, and wood. As structural standards become more rigorous, the demand for precision-stamped, corrosion-resistant thick fender washers has experienced a compound annual growth rate (CAGR) increase, driven by massive infrastructure investments in North America, Europe, and developing manufacturing hubs in Southeast Asia.
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).
We guarantee reliable and rapid lead times for both standard and special orders by using our integrated facility, optimised inventory, and effective planning. Sinsun Hardware is your strategic partner, committed to delivering quality, innovation, and on-time performance worldwide.
ABOUT SINSUNOur metallurgical lifecycle starts with selecting supreme raw materials from XING TAI Steel and Ansteel Group. By running in-house spheroidizing annealing and wire-drawing facilities, we control internal grain structures. This guarantees that when sheet metal is stamped into thick fender washers, it exhibits zero micro-cracking and maintains flat tolerances under 1000+ MPa tensile stresses.
Full process validation checks from raw wire coil up to packaged pallet batching.
Ensures consistent mechanical hardness (HRC 28-32) and removes hydrogen embrittlement.
We are not just suppliers, but your partners. Our engineering team assists in optimizing connection solutions, material selection, and conducting cost-benefit analyses, while providing complimentary sample testing services.
Certified with our proprietary quality management system, we rigorously control the entire process from raw material procurement to cold heading, heat treatment, and surface finishing. Our laboratory conducts tests including salt spray, hardness, and torque tension testing.
Utilizing an ERP-driven intelligent warehousing system, we dynamically manage extensive standard parts inventory to ensure rapid delivery of routine products. Our on-time delivery rate consistently exceeds 99%.
Tailored to your requirements, we offer reverse engineering design, special material customization, thread specification customization, and surface treatment processes (such as Dacromet coating or zinc diffusion coating).
Our worldwide service network ensures you receive technical and commercial support anytime, anywhere. We flexibly meet your diverse needs, serving as your reliable partner for business expansion.
For industries where reliability is non-negotiable, Sinsun delivers certified security, precision, and partnership. As a specialist manufacturer, we provide end-to-end solutions for OEMs and distributors worldwide.
From our founding in 2006, Sinsun has grown into a leading Chinese fastener manufacturer. Explore our journey of expansion, from establishing exports in 2012 and integrating German technology in 2018, to achieving a 36,000-ton annual output and adding advanced heat treatment lines by 2025. Our commitment to heavy industrial parts, including thick fender washers, structural bolts, and custom stamping plates, remains unwavering.
Company founded; initiated core production of structural nails and flat washer stampings.
Established international export divisions, penetrating Middle East and Southeast Asian logistics networks.
Integrated German-imported multi-station cold heading systems and Taiwanese precision dies.
Annualized output capacity scales to 36,000 tons with four online automated heat treatment units.
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 we produce.
At SINSUN, we combine German-engineered multi-station cold heading machines with precision Taiwanese production technology. Our specialized processes, including tail-gripping for drill screws and high-tonnage progressive die stamping for thick fender washers, ensure every fastener is manufactured with utmost accuracy and consistency in our state-of-the-art production facility.
SINSUN operates four dedicated heat treatment lines, allowing for precise and controlled processing time to achieve consistent hardness and enhanced product durability. This in-house capacity ensures both exceptional fastener quality and reliable delivery schedules. Our heat treatment systems support end-to-end manufacturing control, maintaining exact parameters for high-tensile components.
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.
Our engineers collaborate on stress profiles, 3D CAD modeling, and custom alloy consultation (carbon steel, duplex stainless, brass).
Utilizing high-speed cold forging, advanced stamping, CNC thread rolling, and Dacromet or zinc diffusion coating processes.
Automated optical sizing, torque test-rigs, salt spray chambers (1000+ hrs), and ISO 9001 certification paperwork.
Flexible contract warehousing, customized export shipping configurations, and container consolidation to key international ports.
We analyze the load specifications, thickness boundaries, and environmental exposures to draft a clear design layout.
Our engineers develop optimized production tooling designs and provide competitive, transparent wholesale pricing.
Prior to launching high-volume production, Sinsun outputs and ships samples for lab verification and torque testing.
Raw wire is processed, heat-treated, and stamped with in-line computerized dimensional measurement audits.
Every batch undergoes critical load testing, surface thickness measurements, and validation certificates (EN 10204 3.1).
Products are packaged, loaded onto palettes, and dispatched via maritime routes under strict export document control.
Challenge: A tier-1 automotive supplier needed a custom flange assembly with exceptional vibration resistance and structural load dispersion.
Sinsun Solution: Redesigned the washer face geometry using specialized structural alloys, modifying inner and outer diameter ratios, coupled with heat-treated surface passivation.
Result: Realized a 15% weight reduction while passing all 2,000-hour vibrational testing procedures, integrating seamlessly into high-speed automotive production lines.
Challenge: A marine structural firm required heavy-duty structural washers displaying extreme corrosion resistance for continuous saltwater immersion.
Sinsun Solution: Developed custom thick-grade duplex stainless steel fender washers with specialized passivation coatings, ensuring material compliance reports.
Result: Zero fastener failures reported across the critical structural junctions, exceeding initial durability forecasts by 30%.
Standard flat washers generally feature a thickness range of 0.8mm to 1.6mm. A thick fender washer is structurally engineered with a thickness of 2.0mm, 3.0mm, 4.0mm, or even up to 6.0mm. This heavy-duty gauge allows the washer to absorb immense tightening torque without cupping or deformation, making it suitable for anchoring steel frames, timber structures, and vibrating heavy machinery.
The choice of materials depends on the operational environment. Carbon Steel (C1022A, Q235, 45# steel) is commonly used for general industrial assemblies and construction, often treated with zinc plating or hot-dip galvanizing. Stainless Steel (SUS 304, SUS 316) is specified for marine or chemical processing environments to prevent galvanic corrosion. Specialty alloys are used in high-temperature or aerospace applications.
We utilize advanced Taiwanese progressive stamping dies and German multi-station equipment. In-line laser detection sensors verify dimensional tolerances of internal diameter, outer diameter, and plate thickness to within ±0.02mm. Furthermore, our raw steel wires are drawn in-house, ensuring uniform steel density prior to stamping.
Yes, custom-tailored solutions are a core strength. Customers can supply drawings, standard references (like DIN 9021, ISO 7093, USS, SAE), or specify custom parameters (e.g., extremely wide outer diameters with heavy-duty thicknesses). We provide 3D CAD drawing previews and dispatch physical, pre-production validation samples.
While our automated production lines are optimized for high-volume wholesale, we support lower MOQs for development phases or large-scale project initialization. Standard manufacturing lead times vary between 4 to 6 weeks, depending on volume, mechanical specification, and specialized finishing coatings (such as Dacromet or Geomet).
All shipments undergo strict quality inspections and are dispatched alongside comprehensive documentation. This includes Material Test Certificates (MTC) detailing steel composition, hardness test results (HRC parameters), salt-spray test logs validating corrosion resistance (up to 1,000+ hours), and dimensional conformance metrics.
Get in touch with Sinsun's technical sales engineering division today. Send us your drawings, load parameters, or thickness specifications, and receive a comprehensive commercial quotation within 48 hours.
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