Explore our top-tier industrial structural fasteners, manufactured with certified raw materials and exported globally.
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.
About Sinsun HardwareA deep dive into industrial locking configurations, prevailing torque principles, and international criteria defining safety in critical connections.
Often referred to as elastic stop nuts, these utilize a captive nylon ring situated at the collar. As the bolt threads engage the collar, they force their way through the non-tapped nylon, creating a radial compression force that resists rotational loosening from heavy vibrations. Perfect for structural and automotive frameworks.
Designed for high-temperature and harsh chemical environments where polymer inserts fail. Deformed or elliptical threads on the upper collar generate constant friction against mating threads. Known for maintaining clamping force up to 300°C under severe dynamic stress.
Mainly deployed in heavy civil engineering and pressure vessel assemblies. Featuring a thicker profile and larger width across flats (AF) than standard nuts, distributing high tension loads and providing massive resistance against structural shear forces.
| Locking Nut Type | Standard Specification | Temperature Threshold | Reusability Factor | Corrosion Protection / Coating Options | Primary Application |
|---|---|---|---|---|---|
| Nylon Insert Lock Nut | DIN 985 / ISO 7040 | -50°C to +120°C | Medium (limited by nylon wear) | Zinc Plated, Dacromet, Yellow Zinc | Automotive suspension, electronics housings |
| All-Metal Lock Nut (Prevailing Torque) | DIN 980V / ISO 7042 | Up to +300°C | High (retains mechanical deformation) | Phosphated, Geomet, Black Oxide | Exhaust systems, heavy machinery motors |
| Flange Lock Nut with Serrations | DIN 6926 / EN 1664 | Up to +250°C | Low (serrations bite mating material) | Hot Dip Galvanized, Zinc Flake | Solar racking, structural frame joints |
| Heavy Hex Prevailing Torque | ASME B18.16.6 (Grade C/G) | Varies by alloy | Medium-High | Zinc-Nickel, PTFE Coating | Petrochemical pipelines, offshore platforms |
At SINSUN, our quality control begins at the source. We start with premium raw materials from XING TAI Steel and Ansteel Group (utilizing 10,000+ tons/year of C1022A steel, mid-carbon, and alloy steel variants), then perform in-house spheroidizing annealing and precision wire drawing in our own plant. This end-to-end control, supported by our advanced drawing machines and gas-fired furnaces, ensures superior microstructure, consistency, and performance in every fastener we produce.
Combining German-engineered multi-station cold heading machines with precision Taiwanese production technology, our specialized processes, including tail-gripping for drill screws, ensure every fastener is manufactured with utmost accuracy and consistency in our state-of-the-art production facility.
From Sinsun founding in 2006, Sinsun has grown into a leading Chinese fastener manufacturer. Explore our journey of expansion, integration, and continuous improvement.
Establishment of Sinsun Hardware in Tianjin, China. Initial focus on local manufacturing of structural screws and heavy standard parts.
Launch of global export division. Opening international markets across the Middle East, Southeast Asia, South America, and Eastern Europe.
Comprehensive modernization of production zones, integrating German-imported multi-station cold heading systems and specialized ERP controls.
Achieving 36,000-ton annual output with 4 advanced in-house heat treatment lines, smart automated packaging, and global supply chain support.
How we balance localization, rigorous specifications compliance, and target environmental requirements for key industries worldwide.
Under constant vibrations and cyclical heat, automotive chassis and engine sub-assemblies demand high prevailing torque nuts to prevent joint relaxation. Sinsun offers specialized Class 8 & 10 DIN 985 lock nuts with customized friction coefficient finishes.
Vibration ResistanceOutdoor solar parks face extreme weather conditions and wind loads. Sinsun's Hot Dip Galvanized and Dacromet coated flange lock nuts guarantee over 1,000 hours of salt spray resistance (ISO 9227) and reliable electrical grounding.
Corrosion ProtectionMining and agricultural equipment operate in dust, mud, and high impact environments. All-metal lock nuts with deep thread alignment prevent stripping and locking system failures under extreme axial tension.
Tension StabilityFor global manufacturers, localized regulatory compliance is not negotiable. Sinsun Hardware ensures all exported fasteners adhere to the latest RoHS (Restriction of Hazardous Substances) and REACH protocols. Specifically for European distributors, we offer hex lock nuts free of Hexavalent Chromium (Cr6+), using environmentally friendly trivalent zinc passivation or advanced zinc flake coatings (such as Geomet or Dacromet). This guarantees hassle-free customs clearance and simplifies global supply chain audits.
A clear, structured timeline from consultation to final delivery, ensuring transparency and zero-defect quality control.
We begin by deeply understanding your application, challenges, and project goals, identifying the right lock nut specification.
Our engineers propose structural or material solutions and provide a detailed, transparent quotation with lead times.
We produce and deliver initial samples for your rigorous testing and final approval before kicking off production.
Mass production begins in our specialized zones, utilizing multi-station cold heading and real-time SPC quality checks.
Every batch undergoes final dimension checks, tension, hardness and salt spray testing, providing full traceability reports.
Smart ERP packaging and custom boxes are prepared for fast container dispatch with ongoing logistical support.
How our engineering support, full traceability, and vertical capabilities protect your manufacturing lines.
We are not just suppliers, but your partners. Our engineering team assists in optimizing connection solutions, material selection, and conducting cost-benefit analyses, while providing complimentary sample testing services.
Certified with our proprietary quality management system, we rigorously control the entire process from raw material procurement to cold heading, heat treatment, and surface finishing. Our laboratory conducts tests including salt spray, hardness, and torque tension testing.
Utilizing an ERP-driven intelligent warehousing system, we dynamically manage extensive standard parts inventory to ensure rapid delivery of routine products. Our on-time delivery rate consistently exceeds 99%.
Tailored to your requirements, we offer reverse engineering design, special material customization, thread specification customization, and surface treatment processes (such as Dacromet coating or zinc diffusion coating).
For industries where reliability is non-negotiable, Sinsun delivers more than just fasteners—we deliver certified security, precision, and partnership. As a specialist manufacturer, we provide end-to-end solutions for OEMs and distributors worldwide, ensuring every bolt, screw, and nut meets the highest standards of performance and durability.
Real-world applications proving the efficiency, durability, and customization capabilities of Sinsun's engineering team.
Challenge: A tier-1 automotive supplier needed a custom flange bolt and mating lock nut with exceptional vibration resistance and weight reduction.
Sinsun Solution: Redesigned the component assembly using a tailored alloy steel and specialized prevailing torque thread-locking feature. Managed full testing suite to meet automotive standard specifications.
Challenge: A marine engineering company required large-diameter structural bolts and hex lock nuts with extreme corrosion resistance for a harsh saltwater environment.
Sinsun Solution: Recommended and supplied a duplex stainless-steel grade combined with a specialized passivation coating. Provided full material chemical mill test reports and tracking codes.
Every month, we welcome clients from across the country for on-site factory visits, demonstrating our transparency and production strength. As a trusted industry partner, we actively participate in global exhibitions to connect, exchange insights, and showcase innovation — building lasting relationships based on quality and reliability.
Expert responses regarding standards, engineering limits, order handling, and custom manufacturing processes.
We design, manufacture, and supply a comprehensive range of 20,000+ SKUs of reliable fasteners including screws, rivets, nails, and anchors.
Premium structural wood screws, roofing felts, self-drillings and drywall nails for architectural integration.
Your project deserves a fastener partner who understands the critical link between a single component and overall system integrity.
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.
SINSUN
