Explore our primary array of high-grade industrial-strength fasteners, custom-manufactured to global OEM specifications.
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 specialise in offering unique fastening solutions that are tailored to your specific needs. Our technical team works directly with clients from design to manufacturing, providing support for unusual materials, coatings, dimensions, and performance requirements to ensure that each custom order matches exact specifications. 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.
In modern industrial assembly, the mechanical threat of vibration-induced loosening remains one of the primary causes of structural failures. Stainless Steel Lock Washers act as safety-critical components across heavy machinery, automotive systems, rail infrastructure, and marine environments. The demand is heavily catalyzed by the global transition towards renewable energy—such as wind and solar—where infrastructure is subjected to continuous aerodynamic dynamic stress and ambient corrosive conditions.
As standard lock washer solutions evolve, engineers are increasingly rejecting generic carbon steel washers due to structural fatigue and early oxidation risks. Stainless steel variants, primarily utilizing grades 304, 316, and specialized duplex alloys, have become the standard for demanding assembly setups. Modern heavy industrial procurement managers now look for high-grade OEM partners capable of supplying specialized lock washers with certified metallurgical consistency, precision tolerances, and exceptional fatigue life.
Standard off-the-shelf washers often fail to satisfy critical structural constraints. High-performance OEM lock washers are custom-engineered for specific preload requirements, torque margins, and application geometries. Sinsun Hardware addresses this demand by utilizing high-precision manufacturing, beginning with premium steel drawn from the Ansteel Group, and controlling the entire manufacturing pipeline to assure microstructural integrity.
Lock washers primarily secure bolted joints in one of two ways: friction-based deformation or tension-based wedge locking. Split spring washers (DIN 127) apply axial force via spring tension to increase friction between the fastener head and mating surface. However, under high dynamic loads, tension-based wedge lock washers (complying with DIN 25201) are increasingly favored. Wedge lock washers use cam structures on the inner faces to lock the joint, ensuring the pre-load tension is maintained even under intense harmonic vibration.
Selecting the correct stainless steel grade is critical to prevent galvanic corrosion and hydrogen embrittlement. Sinsun's lock washers are manufactured with refined microstructure controls through spheroidizing annealing. By utilizing optimized heat treatments (HRC 28-32), we prevent brittleness, allowing the washers to withstand extreme thermal expansion cycle stresses without structural deformation or material fatigue.
Maintains mechanical tension preventing bolted joints from working loose under dynamic cyclical loads.
Sustains 1,000+ hours salt spray test for demanding chemical, offshore marine, and industrial conditions.
Strict dimensional controls kept to ±0.02mm, ensuring consistent clamping force distribution.
Our integrated processing facility drives accuracy, capacity, and reliability across every batch we deliver.
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.
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 ensures superior microstructure, consistency, and performance in every fastener we produce.
From startup to global leader: follow our milestones of capacity expansion and tech integration.
Established Sinsun Hardware with a focus on manufacturing robust, reliable standard fasteners for domestic industrial users.
Expanded distribution and opened export lines into Eastern Europe, Russia, South America, and the Middle East.
Upgraded the production lines with multi-station cold heading machinery imported from Germany and process monitors from Taiwan.
Achieved a 36,000-ton annual output milestone, integrated a 12,000 sqm smart warehouse, and automated multi-channel logistics support.
Discover where Sinsun's stainless steel lock washers and fasteners deliver vital structural security.
Saltwater exposure requires corrosion-resistant SS316 duplex lock washers. Sinsun's products withstand severe marine environments, resisting chemical oxidation and high winds.
Continuous engine vibration and thermal cycling require high-tensile fasteners that retain clamping force to prevent catastrophic system failures.
Heavy machinery and steel frame building connections rely on consistent lock washer performance to resist shear stresses and load variations.
Our structured system ensures full traceability, customized specifications, and reliable delivery.
We analyze your specific load conditions, vibration levels, and environment to determine the optimal stainless steel grade.
Our engineers model custom dimensions and supply pre-production samples for client laboratory testing.
Utilizing German cold-heading machinery, we manufacture components under strict tolerances (±0.02mm) with continuous SPC monitoring.
The fastener industry is evolving rapidly, driven by automation and safety demands. Smart fasteners featuring embedded IoT sensors for real-time clamping force monitoring are beginning to emerge in heavy infrastructure and aerospace applications. Sinsun Hardware is continuously investing in research and development to align with these industry-wide shifts.
At the same time, environmentally sustainable plating processes are replacing older chemical solutions. High-durability coatings like Dacromet and zinc flake offer superior protection without risking hydrogen embrittlement. Sinsun is also upgrading its metallurgical processing to handle ultra-high-strength stainless steel alloys, preparing for the next generation of industrial needs.
Technical answers to critical procurement and engineering queries.
Contact Sinsun today for a detailed consultation. Send us your drawings or specifications, and our engineering team will provide a solution-focused quote within 48 hours.
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