Established in 2006, Sinsun Hardware has emerged as a premier developer and global supplier of industrial fastening solutions. Operating from an integrated 30,000 square meter manufacturing footprint, we control every step of the supply chain. We maintain a modern 12,000 square meter smart warehouse with an 18,000+ pallet capacity, facilitating the exportation of over 8,500 containers annually to Europe, South America, the Middle East, Southeast Asia, and Russia.
Our core technical capability is engineered around zero-defect processing, utilizing premium carbon steels and stainless steels sourced directly from XING TAI Steel. From spheroidizing annealing to multi-station cold heading and heat treatment, Sinsun ensures all components—especially our high-integrity Welding Washer Nuts—deliver absolute mechanical performance under extreme loading scenarios.
Welding washer nuts are essential elements in heavy industrial assembly, engineered to resolve joint laxity in high-vibration environments. Our production designs combine a heavy-duty nut body with an integrated washer base to distribute mechanical clamp loads and safeguard surface integrity.
Modern automotive designs demand strong, lightweight frames. Sinsun's weld nuts with integrated washers support automated robotic assembly lines. The configuration maintains structural joint integrity under severe cyclical stress and high thermal loading, preventing mechanical distortion during projection welding.
Outdoor photovoltaic mounting structures and wind turbine auxiliary systems require hardware capable of resisting environmental exposure. Sinsun provides customized hot-dip galvanized and stainless steel weld washer nuts that deliver over 1,000 hours of salt spray resistance (ISO 9227 compliant), mitigating galvanic corrosion.
Farm machinery operates under high dust, moisture, and mechanical shocks. Our cold-forged class 8 and class 10 carbon steel weld nuts offer high shear strength (1,000+ MPa) and fatigue resistance, preventing fastener stripping or weld fracture when subjected to heavy tillage loads.
The global industrial fastener market is experiencing a transition toward automated assembly. Production lines rely on robotic feed systems where component tolerances must remain tight. Sinsun Hardware addresses this demand by manufacturing components to a dimensional accuracy of ±0.02mm.
Our welding washer nuts are engineered to international specifications, ensuring compatibility across broad mechanical projects.
| Parameter / Dimension | Standard Carbon Steel (Grade 8 / 10) | Stainless Steel Alloys (A2-70 / A4-80) | Testing Protocols Applied |
|---|---|---|---|
| Hardness Spectrum | HRC 28 - 32 / HV 270 - 320 | HRB 85 - 95 / HV 170 - 210 | Vickers & Rockwell Hardness Testing |
| Tensile Strength Limit | ≥ 800 - 1,040 MPa | ≥ 700 - 800 MPa | Universal Tensile Tester Machine |
| Dimensional Accuracy | Within ±0.02 mm | Within ±0.025 mm | Optical Sorting Systems & Micrometers |
| Salt Spray Resistance | 1,000+ Hours (Special Zinc Flake coating) | Natural Passivation (> 1,500 Hours) | ASTM B117 / ISO 9227 Salt Chambers |
| Surface Finish Roughness | Ra ≤ 0.4 μm | Ra ≤ 0.35 μm | Surface Profilometer Profiling |
From Sinsun's 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.
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, remaining the commitment behind every screw we manufacture today.
The year 2012 marked a 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 control from the raw material stage to ensure consistency in every piece.
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, strengthening our manufacturing foundation.
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. This period underscored our capacity to deliver at scale to a global market.
To ensure timely delivery for our clients, we operate a 12,000-square-meter ready-stock warehouse. This facility is dedicated to supporting 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.
We process premium steel coils sourced from XING TAI Steel. Our four gas-fired spheroidizing annealing furnaces optimize the internal microstructures of the metal, ensuring ductility before cold heading.
Utilizing German cold-heading machinery paired with precision Taiwanese tooling, we form the nuts and integrated washers under high force. This method preserves grain boundary continuity and delivers superior mechanical strength.
Our heat treatment lines control carbon potential and quenching oil temperatures. This delivers uniform hardness (HRC 28-32) and helps minimize carbon depletion zones on the fastener surface.
Different regions enforce specific compliance structures for structural fasteners. Sinsun's engineering team designs and manufactures components to satisfy international regulatory guidelines.
As manufacturing processes shift toward digitalization, the design of fastening components must adapt. Sinsun is modernizing its operations to deliver smarter, more sustainable hardware solutions.
We are working to integrate steel manufactured in low-carbon electric arc furnaces. Our goal is to reduce carbon intensity while maintaining the material purity required for heavy-duty welding processes.
We are installing modern CCD optical inspection machines across our lines. This equipment checks critical parameters like pitch diameter, weld projection height, and concentricity to target a zero-defect rate.
We are engineering thin-film inorganic coatings that maintain low electrical resistance for clean spot welds while shielding components from galvanic corrosion in electric vehicle assemblies.
Quality projection welding depends on three main variables: welding current, pressure profile, and squeeze time. Sinsun ensures consistent projection shapes and dimensional uniformity, which allows the metal to melt evenly without creating blowholes or cold welds.
The built-in washer base increases the contact surface area, which helps distribute clamping pressure across sheet metal parts. This configuration prevents surface deformation during tightening and bridges oversized or slotted alignment holes.
Plating coatings like zinc or nickel can vaporize under high welding temperatures, which may cause porosity in the weld joint. Sinsun offers custom options like plain finish welding areas with plated washer bases, or weldable coatings that prevent spatter.
For high-tensile applications, we utilize medium carbon steel alloys (such as 10B21 or 35K) sourced from XING TAI Steel. These materials undergo in-house spheroidizing annealing to ensure the ductility needed for strong welds.
Yes. Our engineering department can design custom sizes, unusual thread configurations, and specific projection styles. We support clients from initial 3D design models through to physical pilot runs and full production.
We manage shipping timelines through our 12,000 sqm warehouse, which holds standard inventory ready to dispatch. We also use integrated ERP scheduling to coordinate production phases, from raw steel drawing to final export packing.
We regularly host international trade partners for audits at our manufacturing facility. Sinsun also presents its latest hardware developments at major global industrial exhibitions.
