Explore our leading industrial fastening products manufactured with state-of-the-art cold forging technology and premium-grade steel alloys.
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 and precision fastener assemblies, we operate from a gigantic 30,000 sqm integrated facility. This 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).
Deep-dive research into global supply dynamics, material specifications, and technological demands driving the fastener market.
Modern applications dictate specialized washer profiles. Integrated screw-washer configurations (SEMS assemblies) are seeing explosive growth. They prevent washer loss, improve assembly-line efficiency by up to 35%, and guarantee constant torque distribution under high-vibration conditions.
Transitioning from basic zinc plating to premium organic metallic coatings and high-performance stainless steel (304, 316, 410) has become standard. Demands for 1,000+ hours of neutral salt spray testing without red rust formation are common in marine, automotive, and infrastructure sectors.
Global procurement teams prioritize vendors with vertical supply integration. Dealing with a single factory managing everything from wire spheroidization to final inspection mitigates quality variance and reduces logistics overheads by avoiding multi-tiered subcontracting.
Trace our history of technology integration, vertical supply control, and production scaling from 2006 to 2025.
Sinsun was established with a singular, dedicated focus: to build a specialized production facility for high-performance self-tapping screws. This early specialization established our metallurgical expertise, laying the foundation for all our advanced fastener products.
To serve the expanding needs of overseas distributors, Sinsun established its dedicated Export Department. Our engineering teams began manufacturing custom washers and specialized screws compliant with DIN, ANSI, and JIS standards, shipping across the globe.
To assure absolute metallurgical quality, Sinsun installed 4 large gas-fired spheroidizing annealing furnaces and in-house wire-drawing units. This shift enabled us to process raw coils directly from premium domestic steelmakers like Xing Tai Steel, optimizing microstructure and tensile strength at the source.
We expanded production capacity by importing multi-station cold heading machinery from Germany and high-precision forming machinery from Taiwan. We introduced self-drilling screw lines with advanced tail-gripping technologies, securing sub-millimeter tolerances.
Sinsun hit a record annual output of 36,000 tons, exporting over 1,100 containers globally. This reinforced our position as a reliable industrial fastener supplier capable of handling massive commercial volume requests without compromise.
A dedicated 1,200 sqm ready-stock facility was established inside our main hub to support high-turnover SKUs. This allows Sinsun to offer immediate dispatch for standard orders and support just-in-time (JIT) delivery systems for domestic and global contractors.
To further upgrade structural properties and shear-stress tolerances, Sinsun added 4 state-of-the-art automated heat treatment lines. This in-house capacity guarantees consistent hardness profiles (HRC 28-32) and eliminates hydrogen embrittlement risks in structural fastener combinations.
Direct sourcing of alloy coils from XING TAI Steel. Spheroidizing annealing adjusts carbon distribution for uniform forming.
Multi-station cold header machines produce washer-fastener assemblies with tight dimensional limits (±0.02mm).
Controlled atmosphere tempering lines achieve tensile strength up to 1000+ MPa while preserving ductility.
Includes microhardness testing, optical profiling, salt spray testing (1,000+ hours), and torque analysis.
Our vertically integrated facility eliminates dependencies on external processing plants, ensuring that global partners receive reliable shipments with minimized price volatility. Starting with raw material sorting, Sinsun handles wire drawing, stamping, assembly, thread rolling, heat treatment, and anti-corrosive finishing all in one location.
This streamlined process allows Sinsun to customize packaging and deliver tailored OEM/ODM solutions. Our logistics department supports custom 3D packaging designs, rapid sorting, and complete documentation, ensuring trouble-free customs clearance and logistics delivery.
Review key technical standards, torque requirements, and material properties verified by our internal Quality Assurance team.
| Washer Assembly Type | Base Materials | Dimensions Range | Surface Finishes | Hardness / Yield | Industrial Applications |
|---|---|---|---|---|---|
| Plain Flat Washer Assemblies | Carbon Steel, SS304, SS316 | M2 - M36 (Customizable) | Zinc, Hot Dip Galvanized | HRC 28-32, 1,000+ MPa | Construction, Machinery |
| Helical Spring Lock Washer | Spring Steel, 65Mn, SS302 | M3 - M24 | Black Oxide, Dacromet | HRC 44-50 | High-Vibration Assemblies |
| EPDM Backed Bonded Washers | Carbon Steel + EPDM Synthetic | #10, #12, #14 (Specialized) | Ruspert Coating, Color Painted | Weatherproof Seal | Metal Roofing, Cladding |
| Internal / External Toothed | Carbon Steel, Stainless Steel | M3 - M16 | Trivalent Zinc (Cr3+) | Preventative Slip Teeth | Electronics, Automotive |
Discover how Sinsun custom washer and screw designs provide high-durability holds across diverse global environments.
Practical technical answers to common industrial washer questions from our Head of Metallurgical QC.
For class 10.9 and 12.9 washers, hydrogen embrittlement is a serious risk if electroplating isn't monitored. Sinsun implements a precise baking process within four hours of acid pickling or plating. Baking at 200°C for 8-12 hours drives out trapped hydrogen atoms from the steel lattice, maintaining raw material ductility.
For high-precision applications, we work within Taiwanese-class dimensional controls, achieving flat washer thickness tolerances of ±0.02mm and inner/outer diameter ranges within ±0.05mm. These tight tolerances ensure seamless feeding in high-speed auto-insertion manufacturing lines.
For standard conditions, hot-dip galvanizing is cost-effective, providing 50-80 microns of zinc coating. For highly corrosive environments, we recommend multi-layer organic zinc flake coatings (such as Dacromet or Ruspert). These provide over 1,000 hours of salt spray protection and resist temperatures up to 300°C without breaking down.
Yes. Our in-house engineering and toolmaking shop can fabricate customized stamping dies to meet specific customer requirements. We support specialized profiles, spring rates, edge finishes, and custom EPDM/rubber backing integration based on your engineering drawings or 3D models.
Explore our second category of advanced structural nails, heavy clamps, specialized wood screws, and drywall anchor products.
Send your dimensional tolerances, custom drawing configurations, and target volume metrics to our engineering division.
