Explore our internationally certified range of high-performance anchoring, structural, and self-locking solutions.
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.
Understanding the mechanics of British Standard Whitworth (BSW) threads combined with non-metallic insert locking technology.
Unlike metric 60-degree threads, the BSW profile features a 55-degree angle with rounded roots and crests. This reduces stress concentrations, making BSW Nyloc nuts highly effective at distributing axial tensile loads under cyclical shear stresses.
The nylon insert is designed with an undersized inner diameter. As the male thread enters the collar, it does not cut the nylon; instead, it displaces it plastically. The radial compression creates a tight, zero-play interface that resists vibration-induced back-off.
Our upcoming engineering roadmap introduces high-temperature fluoropolymers (such as PVDF and PTFE) replacing standard Nylon 66. This extends the continuous operating limit of our Nyloc nuts from 120°C up to 200°C without sacrificing prevailing torque.
From Sinsun 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.
Established Sinsun Hardware with a core focus on manufacturing reliable industrial fasteners for the domestic infrastructure boom.
Expanded target markets internationally, setting up dedicated export departments and obtaining ISO quality management certifications.
Modernized the production lines with German-imported multi-station cold heading machinery and precision Taiwanese manufacturing tooling.
Achieving a 36,000-ton annual output with 4 advanced in-house heat treatment lines and fully automated warehousing facilities.
How BSW Nyloc Nuts solve high-stress problems across global heavy industries.
Railways and structural bridge crossings experience constant low-frequency, high-amplitude vibrations. Our BSW Nyloc nuts maintain initial clamping load over millions of cycles, reducing maintenance intervals and preventing catastrophic joint loosening.
Saltwater exposure accelerates chemical degradation. By utilizing high-grade stainless steel (304/316) and protective barrier coatings, Sinsun BSW nuts resist chloride pitting while ensuring locknut integrity under tidal forces.
Earthmoving equipment, vibratory screens, and crushing mills generate massive shocks. The prevailing torque mechanism of our Nyloc nuts prevents backing off even when subjected to impact loading that would loosen standard nuts.
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, supported by our advanced drawing machines and gas-fired furnaces, ensures superior microstructure, consistency, and performance in every fastener we produce.
At SINSUN, we combine 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.
Integrating smart manufacturing, thermal treatment control, and automated logistics to guarantee supply reliability.
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. Our heat treatment systems support end-to-end manufacturing control, eliminating third-party processing delays and quality variations.
Controlled carbon potential atmospheres prevent surface decarburization, ensuring that the 55° BSW threads maintain their shear strength under maximum tension limits.
SINSUN offers flexible OEM and ODM packaging tailored to your needs. With a professional packaging team and a 12,000 m² warehouse, we provide custom packaging, 3D design previews, and full logistics support to deliver a seamless, worry-free experience from production to shipment.
Our smart inventory system ensures real-time tracking of raw steel, semi-finished components, and packed cargo ready for container stuffing, reducing lead times for OEM projects significantly.
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.
Why major distributors and engineering firms choose Sinsun for high-demand fastener supplies.
Over 200 German-imported multi-station cold heading machines (producing 1,200+ pieces/min/machine) and 4 dedicated in-house heat treatment lines (20-ton/day capacity) guarantee superior screw quality, strength, and durability (fatigue life exceeding 50,000 cycles).
Core steel sourced exclusively from Ansteel Group (utilizing 10,000+ tons/year of C1022A steel). This high metallurgical purity guarantees structural stability and predictable behavior during thermal processing.
Our 12,000 sqm dedicated packaging warehouse enables 24/7 operations with automated sorting (3,000+ cartons/hour) and direct container loading (50+ TEUs/day).
Seamlessly serve orders from unique custom orders (1-piece prototypes) to massive wholesale volumes (100M+ unit monthly capacity).
We design, manufacture, and supply a comprehensive range of 20,000+ SKUs of reliable fasteners including nails, screws, wires, and rivets.
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.
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).
Our worldwide service network ensures you receive technical and commercial support anytime, anywhere. We flexibly meet your diverse needs, serving as your reliable partner for business expansion.
Navigating different national markets requires deep compliance expertise. Our engineering support group translates localized criteria seamlessly. For clients in the UK, Europe, and Commonwealth countries, we fully support British Standard specifications (BS 1083 / BS 1768) alongside standard metric DIN and Unified thread systems (UNC/UNF).
All Sinsun products comply with directives like RoHS and REACH, guaranteeing that chemical passivations, zinc platings, and polymer inserts do not contain hazardous substances. Complete testing documentation including material chemical analyses (EN 10204 3.1 certification) and mechanical breakdown data are supplied with every dispatch batch.
Combining advanced manufacturing technology with deep engineering expertise to serve automotive, aerospace, construction, and electronics sectors.
Don't just find a part; develop the optimal solution. Our engineering team partners with you from the concept stage.
Technical Collaboration: Our engineers work with your team to analyze stress, corrosion, and environmental requirements.
Prototyping & 3D Modeling: Rapid prototyping and detailed CAD models to validate form, fit, and function before mass production.
Our vertically integrated manufacturing facilities ensure control over every stage of production.
Cold Forging & Hot Forging: High-volume production of superior strength parts with excellent material utilization.
CNC Machining: Precision machining for complex, non-standard fastener geometries and critical tolerances.
Your confidence is built on our commitment to zero defects.
Full-Dimension Inspection: Automated optical measurement and manual QC checks at every production stage.
Material Testing: Salt spray testing, hardness testing, tensile strength testing, and torque-tension analysis.
We are your reliable link in the global supply chain.
Flexible Order Fulfillment: Support for both large-volume contracts and smaller, just-in-time orders.
Expert Packaging: Custom packaging solutions designed to prevent damage and simplify assembly handling.
Our structured workflow guarantees transparency, on-time delivery, and a perfect match for your specifications.
We begin by deeply understanding your application, challenges, and project goals.
Our engineers propose solutions and provide a detailed, transparent quotation with timelines.
We produce and deliver prototypes for your rigorous testing and final approval.
Mass production begins, with scheduled quality checkpoints and updates provided to you.
Every batch undergoes final audit, and all agreed documentation is prepared.
Your order is shipped efficiently, with our team ready for any follow-up or future needs.
Crucial considerations for industrial procurement heads when choosing an ODM supplier.
Smart procurement targets TCO, not just unit price. Cheap locking nuts with poor thread clearance or low-grade nylon inserts lead to bolt galling and premature stripping. When a joint fails in the field, repair labor and machinery downtime dwarf the cost of premium nuts. Sinsun's strict quality inspections keep PPM defect rates near zero, protecting your bottom line.
With an annual capacity of 36,000 tons and a smart 12,000 sqm warehouse, Sinsun cushions partners against raw material shortages. When steel prices surge or supply chains bottleneck, our multi-ton steel reserve and raw material annealing lines ensure constant production and locked-in pricing for contractual agreements.
Real-world application stories demonstrating our response to engineering challenges.
Challenge: A tier-1 automotive supplier needed a custom flange bolt with exceptional vibration resistance and weight reduction.
Sinsun Solution: Redesigned the component using a tailored alloy and specialized thread-locking feature. Managed full testing suite to meet automotive standards.
Result: 15% weight reduction, passed 2000-hour vibration testing, and seamless integration into client’s high-speed assembly line.
Challenge: A marine engineering company required large-diameter bolts with extreme corrosion resistance for a harsh saltwater environment.
Sinsun Solution: Recommended and supplied a duplex stainless-steel grade with a specialized passivation coating. Provided full traceability and material certification.
Result: Project completed with zero fastener failures, exceeding the client's lifecycle durability expectations.
Technical and commercial clarifications concerning our BSW Nyloc nut production and ordering.
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.
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