Sinsun Hardware, established in 2006, is a leading manufacturer and global supplier of high-quality fasteners. Operating from our state-of-the-art 30,000 sqm integrated facility, we deploy German-imported machinery and precision Taiwanese technology to deliver over 20,000 SKUs of nails, screws, wires, and customized heavy-duty washers. With our deep vertical integration, we provide global clients with engineered solutions that sustain high loads, withstand harsh environments, and minimize structural failure risks.
Our comprehensive production prowess ensures that our custom square flat washers, designed for structural timber, seismic framing, and steel erections, maintain exact dimensional tolerances (±0.02mm) and achieve optimal corrosion resistance (1,000+ hours in salt spray testing).
In heavy-duty applications, standard round washers often fail to prevent wood crushing or maintain joint integrity under dynamic loads. Square flat washers provide significantly larger surface areas to distribute clamping forces, crucial for seismic and timber constructions.
Square flat washers distribute torque loads over a larger surface area compared to round equivalents. This reduces local compressive stress on structural sub-bases, preventing structural pull-through in seismic regions and timber joints.
Produced using high-tonnage precision stamping lines. Flatness is held within strict tolerances to prevent point-loading, and inner diameters match high-tensile bolt dimensions (M6 to M48) according to ISO, DIN, and ASME specifications.
Used widely in structural steel networks, retrofitting masonry, and heavy timber framing. The high thickness (up to 8mm) dampens vibrational shifting and maintains clamping pressure under seismic tension spikes.
As a global OEM supplier, Sinsun Hardware engineers square flat washers tailored to region-specific building codes and environmental conditions:
Unlike round washers, square washers offer parallel flat edges that align perfectly against structural profiles. This prevents the bolt head or nut from rotation during installation in deep channels. In concrete anchors, square plate washers act as highly effective pull-out anchors embedded within concrete forms.
Get Custom Technical DatasheetFrom selecting raw steel from China’s leading mills to finishing with proprietary anti-corrosion barrier coatings, Sinsun Hardware guarantees performance consistency.
We use premium carbon steel and boron-alloyed structural steel sourced from XING TAI Steel. Our in-house spheroidizing annealing furnaces refine the steel grain structures, ensuring uniform ductility before cold-stamping.
Utilizing high-speed stamping systems and Taiwanese multi-station punch machinery allows us to maintain strict thickness dimensions and clean edge profiles without shearing stress micro-fractures.
Our options include Hot-Dip Galvanizing (to ASTM A153 specs), Electro-galvanizing, Yellow Zinc plating, and specialized Dacromet / Geomet coating. These systems protect washers for over 1,000 hours of continuous salt-spray testing.
Explore our journey of expansion, integration of advanced German and Taiwanese technology, and global supply capacity scaling since 2006.
Sinsun established its foundational specialization in Northern China, focusing on developing state-of-the-art metal forming lines to serve both domestic assembly sectors and high-growth export projects.
Establishing the Export Division allowed us to interface directly with construction developers and tier-1 OEM distributors globally, ensuring local technical specifications are translated seamlessly to our manufacturing teams.
By adding four spheroidizing annealing gas-fired furnaces and in-house wire-drawing lines, Sinsun achieved direct quality control at the raw material phase, eliminating variance in steel tensile strength.
Importing German multi-station cold heading and heavy-tonnage stamping equipment expanded our output capability, allowing us to form complex heavy-duty components and specialized square flat washers.
Output reached 36,000 metric tons per year, shipping over 1,100 containers globally. This solidified Sinsun's capability to deliver large-scale project supply orders with fast, reliable turnaround times.
To service high-velocity supply lines, Sinsun constructed a smart warehousing hub with 18,000+ pallet capacity. This facility guarantees immediate shipment of high-demand fasteners and standard washers.
Adding advanced computer-controlled heat treatment lines allows Sinsun to consistently manage hardness profiles (HRC 28-32) and eliminate hydrogen embrittlement risks in our heavy structural products.
Industrial supply chains require consistent quality, high volume capabilities, and predictable delivery windows. Sinsun Hardware, based in northern China's industrial heartland, ensures uninterrupted fastener supply lines:
We supply square flat washers in dimensions matching standard round parameters or custom shapes. Our packaging team provides customized labeling, barcode printing, and private label boxes, complete with 3D design previews, for ready-to-retail or straight-to-jobsite implementation.
Our quality checks encompass dimensional verification, zinc coating thickness checks, hardness tests, and structural integrity evaluations.
Connect with Sinsun Hardware’s technical application engineers to discuss specifications, custom sizing, and volume pricing.
