Explore our primary manufacturing lines. From highly engineered structural fasteners to industrial-grade anchoring systems, we deliver precision design built on German cold-heading standards.
Established in 2006, Sinsun Hardware has grown from an ambitious manufacturing startup into Northern China's largest production base for self-tapping screws and high-durability locking hardware components. Operating a state-of-the-art 30,000 square meter integrated facility, we manage the entire manufacturing cycle starting from raw material handling to global logistical exports.
Equipped with imported German cold heading machinery and precision Taiwanese manufacturing technologies, Sinsun currently processes a catalogue of over 20,000 SKUs. Our multi-language client support hub coordinates with global markets to fulfill shipments spanning South America, Russia, the Middle East, and Southeast Asia, shipping in excess of 8,500 shipping containers per annum.
As structural assembly interfaces face growing dynamic stresses, modern engineering projects require higher performance from lock washer components.
In heavy industries like automotive engineering, photovoltaic installation, marine operations, and rail transit, bolt loosening from vibration or thermal contraction remains a common cause of mechanical failures. Standard washers distribute loads but do not prevent backing-off when subjected to high dynamic vibration. Sinsun's premium Stainless Steel Lock Washers are designed to solve this issue. Engineered with precise spring tensions, tooth geometries, and surface hardness, our washers provide secure locking action across extreme temperature ranges and corrosive environments.
Procurement teams today face the challenge of sourcing components that balance cost-efficiency with strict compliance to global standards. Under the EEAT (Experience, Expertise, Authoritativeness, Trustworthiness) criteria, Sinsun Hardware acts not just as a parts manufacturer, but as an engineering partner. We offer technical documentation, metallurgical testing verification, and clear traceabilty. This ensures that every order of lock washers meets the load requirements and corrosion resistance standards specified by international engineering protocols.
Utilizing high-grade austenitic alloys (SS304, SS316, SS316L) to ensure parts resist galvanic and chemical corrosion in marine, coastal, and chemical processing facilities.
Engineered to resist bolt backing-off. Complies with Junker vibration test criteria (DIN 65151) to maintain clamping force under severe harmonic and mechanical oscillation.
Each production run undergoes over 12 quality checks, ensuring precise dimensions (tolerance within ±0.02mm) and surface roughness values (Ra ≤ 0.4µm).
Our quality control begins at the initial metallurgical stage. Sinsun partners with premium steel manufacturers like Xingtai Steel to source consistent wire rod. By keeping raw material processing, wire drawing, and spheroidizing annealing in-house, we control the microstructure of our alloy materials before manufacturing begins.
This vertical integration ensures consistent mechanical performance. The annealing process optimizes carbon distribution within the steel matrix, preparing the material for cold forming. It prevents cracking and structural failures during high-speed stamping and rolling operations, providing our final lock washers with stable elastic properties and yield strength values exceeding 1,000 MPa.
Sinsun Hardware operates under ISO 9001:2015 protocols to maintain high manufacturing standards across all production runs.
Our lock washers are manufactured to meet leading international engineering standards, ensuring interchangeability and performance in complex industrial applications.
| Standard Ref. | Washer Style | Available Sizes | Thickness Range | Locking Principle | Primary Applications |
|---|---|---|---|---|---|
| DIN 127B | Split Spring Washer | M2 - M48 | 0.5 mm - 7.0 mm | Helical spring compression & sharp edge bite | General machinery construction, automotive linkages |
| DIN 6797 | Internal / External Tooth | M3 - M30 | 0.4 mm - 3.2 mm | Radial tooth penetration into parent material | Electrical grounding connections, home appliances |
| DIN 6798 | Serrated Lock Washer | M3 - M30 | 0.4 mm - 3.5 mm | Serrated teeth distribute clamping friction | Automotive electronics, HVAC compressor mounts |
| ASME B18.21.1 | Helical Spring Lock | #2 - 3 inches | 0.020" - 0.250" | Friction locking & spring thrust force | North American structural steel framing, pumps |
| Wedge-Locking | Double-faced Cam Washer | M3 - M42 | 1.2 mm - 5.0 mm | Tension-based lock utilizing wedge cam angles | Wind turbines, heavy duty construction equipment |
Note on Testing & Passivation: Sinsun's stainless steel lock washers undergo post-forming passivation treatments to remove free iron from the surface. This process creates a passive chromium oxide layer that helps prevent oxidation. Optional performance coatings, including zinc-nickel plating, mechanical zinc plating, and Dacromet coatings, can be applied to meet specific atmospheric corrosion guidelines.
Over nearly two decades, we have continuously scaled our capacity and integrated new production technologies to serve our global client base.
Began operations with a focus on manufacturing self-tapping screws and core fastening components.
Established our dedicated export division, expanding our distribution channels to international markets.
Added spheroidizing furnaces and wire drawing systems to control raw material processing in-house.
Upgraded production lines with German-imported multi-station cold heading systems to improve dimensional accuracy.
Achieved an annual output of 36,000 tons, shipping more than 1,100 export containers over the year.
Developed a 12,000 square meter smart warehouse facility to manage and store finished stock inventory.
Added four modern heat treatment lines to increase production capacity and control material hardness.
Sinsun Hardware offers custom design and manufacturing support for non-standard washer profiles, unique material specifications, and specialized coating requirements.
Industrial applications often require components designed for specific working conditions. Sinsun's engineering division supports custom OEM and ODM lock washer designs, helping partners customize parameters to meet their system requirements.
Whether you require custom dimensions to fit within tight mechanical spaces, specialized tooth configurations, or high-performance coatings like mechanical zinc or Dacromet, our manufacturing facilities are set up to handle these adjustments. We utilize 3D design previews, custom stamping tools, and test runs to verify that all custom parts match your engineering specifications prior to full production.
Transparency and quality assurance are central to Sinsun Hardware's business. We welcome monthly on-site factory visits and inspection audits from partners worldwide.
Technical advice and answers regarding material selection, performance testing, and ODM order processes for stainless steel lock washers.
Split lock washers are designed with a helical gap. When compressed, they act like a spring, generating continuous tension that helps maintain joint friction. The split edges are also designed to bite slightly into the mating surfaces to resist backing-off under vibration.
SS304 (A2) is suited for general outdoor use, resisting fresh water and mild atmospheric conditions. SS316 (A4) contains 2-3% Molybdenum, which increases its resistance to chloride pitting, making it suitable for marine applications, coastal infrastructure, and chemical processing plants.
Yes. Our tooling facility can adjust inner diameters, outer diameters, thickness, and locking styles based on your technical drawings. We provide 3D CAD modeling and design previews before committing to mass production.
Sinsun runs 12+ quality checks, including dimensional inspection using digital micrometers, hardness testing (HRC/HV), salt spray testing for corrosion resistance (up to 1,000 hours), and tension/shear tests to verify yield strength limits.
Hydrogen embrittlement is primarily a risk for high-tensile carbon steel fasteners rather than austenitic stainless steels. For martensitic stainless steels (like 410) that undergo heat treatment, we perform baking processes to relieve hydrogen stress and protect against brittle fractures.
Standard container orders are typically manufactured and dispatched within 30 to 45 days. For custom ODM parts, our technical team will coordinate target timelines depending on tool complexity and sample approvals.
Complete your bill of materials with our supplementary fastening products. Manufactured with the same quality controls as our main production lines.
