Ningyuan Fastener
Ningyuan Fastener
Engineered for harsh environments, high mechanical loads, and certified longevity. Explore our first flagship tier of industrial fastening solutions.
Double ended screws—often structurally referred to as hanger bolts, dowel screws, or double-ended threaded studs—serve as critical connective links in hybrid structural configurations. Typically designed with alternating thread patterns (such as a coarse wood/lag thread on one side and a machine metric/standard thread on the other, or matching machine threads on both ends), these specialized fasteners bridge disparate structural materials. This makes them indispensable in solar mounting systems, modular structural framing, and heavy timber integrations.
As structural engineering advances, the demands placed on these components have increased exponentially. Modern projects demand fasteners that not only resist extreme pull-out and shear forces but also endure harsh environmental conditions. The mechanical composition, micro-alloying elements, and thread integrity are no longer just basic specs; they are critical safety and longevity parameters.
Information Gain Insight: While standard fastener suppliers focus solely on dimensional accuracy, advanced manufacturing centers like Ningyuan focus on the metallurgical grain structure achieved via cold forging, maintaining continuous fiber flow lines to increase fatigue strength by up to 25% compared to machined studs.
From a specialized workshop established in 2005 to a global supply powerhouse, our metrics represent our commitment to quality, capacity, and supply chain security.
How macroeconomic pressures, environmental considerations, and automation are reshaping global fastener procurement.
With the explosive growth of ground-mounted utility solar and rooftop arrays, double ended hanger bolts are increasingly required to penetrate wooden purlins while mounting heavy-duty aluminum or C-steel structures. Precision depth control and integrated EPDM sealing washers are essential to ensure 25+ years of watertight, maintenance-free performance.
Modern risk-management frameworks demand total structural traceability. Procurement teams require fasteners backed by detailed steel mill certificates (such as EN 10204 3.1 certification), verification of chemical composition (carbon, manganese, silicon, phosphorus), and clear heat treatment records to prevent unforeseen structural failures.
Standard zinc plating is no longer sufficient for marine, coastal, and chemical industrial zones. Global projects are shifting toward Hot-Dip Galvanization (HDG), multi-layer Zinc-Flake (Geomet) coatings, and organic topcoats. These coatings must achieve over 1,000 hours of neutral salt spray testing without showing red rust.
Founded originally in 2005 as Jin Langtao, our company has evolved over nearly two decades into a highly modern fastener enterprise. Located in Yongnian, Handan—nationally recognized as the "Fastener Capital" of China—we benefit from an unparalleled local manufacturing ecosystem and raw material supply chain.
We pride ourselves on our core business philosophy: "development is the direction and hard work is the truth". Today, we run a vertically integrated operation. Our facility is equipped with over 50 sets of advanced high-speed cold heading, thread rolling, and CNC machining equipment, allowing us to maintain tight dimensional tolerances, high thread quality, and consistent mechanical properties across massive production runs.
Our comprehensive product catalog covers not only specialized double ended screws but also critical structural components, including photovoltaic brackets, C-shaped steel, U-shaped steel, H-rails, seismic supports, concrete wedge anchor expansion bolts, Hafen slots, and custom high-strength dry wall nails.
Global supply chains require consistent quality and predictable delivery timelines. To meet these demands, Ningyuan has implemented automated production workflows and rigorous in-line quality controls. By transition from traditional manufacturing to Factory 4.0 principles, we maintain precise control over both mechanical properties and dimensions.
Strict Quality Assurance & Compliance: Our production line operates under a comprehensive quality management framework certified by ISO9001. We maintain strict compliance with RoHS, GB/T30512 (automotive banned substances), and 2000/53/EC ELV directives. Additionally, our processes comply with weapons and equipment system quality standards, reflecting our capability to produce defense-grade high-precision fastening hardware.
Engineering Advantage: We manage hydrogen embrittlement relief bake procedures within tight time constraints post-electroplating. This step is critical for preventing sudden failures in high-strength fasteners (Grade 8.8 and above).
Our commitment to rigorous testing and international standard compliance is backed by verified certifications.
Our fasteners are deployed in demanding load-bearing environments across multiple sectors.
Our manufacturing catalog supports full system procurement, ensuring dimensional compatibility across your structural projects.
Common questions from engineering leads, quality assurance managers, and global procurement departments.
We manufacture double ended screws in carbon steels (Medium Carbon Steel, Boron-alloyed steel, and Alloy Steels) across grades 4.8, 8.8, and 10.9 to support various load requirements. For corrosion-prone environments, we supply stainless steel versions in Grades A2-70 (SUS304) and A4-80 (SUS316), which provide excellent mechanical strength alongside chemical resistance.
For fasteners with tensile strengths exceeding 1000 MPa (such as Grade 10.9), electroplating introduces atomic hydrogen into the steel lattice. To prevent failure, we route all electroplated high-strength screws to automated hydrogen-relief baking ovens within 4 hours of plating. They undergo baking at 200°C to 220°C for a minimum of 4 hours to drive out trapped hydrogen.
Yes. Our standard double ended screws feature a coarse wood thread at one end (engineered for maximum fiber engagement in timber) and a standard metric machine thread (such as ISO M8, M10, or M12) at the opposite end. We can customize the thread profiles, pitches, and transition zone lengths to meet specific wood-to-metal, concrete-to-metal, or metal-to-metal connection designs.
For highly corrosive C5 marine zones, we recommend Hot-Dip Galvanization (HDG) to ASTM A153 specifications, which provides a minimum coating thickness of 50-85 microns. Alternatively, we offer Zinc-Flake coatings (such as Geomet or Dacromet), which provide excellent salt spray protection with a thinner profile, avoiding the threat of thread interference.
For standard catalog designs (M8/M10/M12 double ended hanger bolts in standard lengths), we maintain inventory buffers to enable quick shipping. For custom specifications requiring specialized tooling or non-standard alloys, our MOQ typically ranges from 10,000 to 50,000 units depending on size, with lead times of 15 to 30 days.
Every production batch undergoes strict quality control protocols. We provide standard Inspection Certificates showing dimensions, thread tolerances, tensile test results (ultimate tensile strength and yield strength), hardness levels, and plating thickness measurements.
Explore the second tier of our high-durability products, serving key structural, mechanical, and solar anchoring assemblies.
When you require double ended screws or structural fasteners engineered for demanding mechanical applications, our team is ready to support you. We leverage extensive cold-forming expertise, automated quality control systems, and certified manufacturing workflows to support large-scale industrial projects globally.
Get in touch to request free product samples, discuss design customizations with our engineering team, or receive a prompt quotation for your upcoming project.
Address: Handan Yongnian Fastener Industrial Zone, Hebei, China
Core Scope: Photovoltaic support accessories, seismic supports, anchor systems, customized thread inserts, and specialty construction bolts.
Contact us via email, phone, or our social channels. Our engineering team responds to all technical inquiries and RFQ requests within 24 business hours.
Authorized Exporter & Manufacturer:
Handan Ningyuan Fastener Manufacturing Co., Ltd.
