Explore our flagship range of high-performance cap bolts, hexagonal fasteners, self-drilling screws, and structural washers designed for heavy industry applications.
In the globalized industrial economy, fasteners are no longer classified as mere commodities; they represent safety-critical engineering variables. As a premier China Cap Bolt manufacturer, Dongshuo Fasteners understands the immense mechanical demands placed upon heavy-duty connections. Whether resisting cyclic dynamic loads in automotive chassis, tolerating immense thermal fluctuations in turbine casings, or maintaining joint integrity in offshore structural arrays, our cap bolts are manufactured to surpass industry baselines.
Our capabilities span high-strength classes (Grade 8.8, 10.9, and 12.9) featuring customized dimensional configurations and advanced surface treatments. From carbon steel allocation to thread rolling deformation analysis, our processes are optimized for peak performance.
To prevent catastrophic failure modes like hydrogen embrittlement or fatigue cracking, we utilize raw steel stock from elite domestic mills. Raw material selection is guided by clean metallurgy, minimizing non-metallic inclusions and maintaining strict control over carbon equivalent values. This ensures predictable mechanical response during quenching and tempering phases.
We operate multi-station cold heading blocks and automated continuous heat-treatment furnaces to secure microstructure uniformity across millions of produced fasteners daily.
Established in 2015, Handan Yongnian District Dongshuo Fastener Manufacturing Co., Ltd. is situated in Yongnian—the world-renowned epicenter of China’s fastener manufacturing base. Over nearly a decade, we have consolidated our position as a leading global manufacturer and exporter specializing in high-performance cap bolts, structural hex bolts, and specialized nuts.
Our facilities house a comprehensive manufacturing loop, featuring advanced sizing mills, multi-stage cold formers, automatic thread rollers, and a fully equipped chemical and physical testing laboratory. We operate with a strict customer-centric ethos, delivering tailored OEM/ODM solutions to domestic construction groups and international industrial importers.
A closer look at how we transform high-grade alloy raw materials into highly specialized safety-critical structural fasteners.
Modern engineering projects present diverse operational challenges. At Dongshuo, we supply specialized fastening solutions configured to match the ambient and physical stresses of different industries.
High-tensile carriage bolts, structural washers, and double-ended studs play key roles in dynamic structural joints. Roadway bridges, skyscrapers, and railway tracks undergo continuous vibration. Our DIN-certified bolts maintain their preload clamp force under cyclic shear loading, reducing structural maintenance intervals.
Automobile chassis, gearboxes, and suspension mounts require high-integrity components such as our galvanized hex flange bolts (DIN 6921) and Class 12.9 thickened flange nuts. Flange integration distributes clamping pressure across larger surface areas, eliminating the need for independent washers while minimizing dynamic loosening.
Outdoor utility towers and wind turbines are exposed to atmospheric moisture, acid rain, and wind-shear stresses. Our specialized yellow-zinc plated, hot-dip galvanized, and dacromet-coated cap bolts provide superior corrosion resistance. This protection prevents corrosion from inducing premature fatigue cracks in critical components.
For interior outfitting and modular construction, our drywall screws and self-drilling fast-thread screws feature refined geometries that pierce light steel frames efficiently. This reduces installation wear and ensures clean, secure fastening.
| Property Class | Material Specification | Nominal Tensile Strength (N/mm²) | Yield Strength Min. (N/mm²) | Key Industrial Applications |
|---|---|---|---|---|
| Grade 4.8 | Low/Medium Carbon Steel | 400 | 320 | General machinery, brackets, light-gauge structural panels. |
| Grade 8.8 | Medium Carbon Steel, Quenched & Tempered | 800 | 640 | Automotive structural framing, steel framework, industrial pumps. |
| Grade 10.9 | Alloy Steel, Quenched & Tempered | 1040 | 940 | Engine components, high-stress structural joints, agricultural machinery. |
| Grade 12.9 | High Alloy Steel, Quenched & Tempered | 1220 | 1100 | Heavy hydraulic cylinders, wind turbine rotors, aerospace mounts. |
Dongshuo Fasteners is committed to green processing, chemical compliance, and rigorous quality testing.
We combine advanced multi-station formers with a highly trained technical team to handle complex customized designs and non-standard specifications.
We employ energy-efficient heat treatment units and clean wastewater recovery systems, prioritizing environmental protection alongside production output.
Every production batch undergoes spectral analysis, micro-hardness evaluations, and salt-spray testing to verify it meets global performance benchmarks.
The industrial fastening sector is undergoing shifts driven by robotics, electric vehicle platforms, and smart structural monitoring. Dongshuo's engineering team is actively advancing technology in three key areas:
Integrating direct tension indicators and micro-sensor layouts to monitor joint preload forces remotely in critical structural systems.
Transitioning hex cap bolt plating from traditional hexavalent chromium coatings to multi-layer chrome-free zinc flake systems, extending salt-spray resistance past 1,500 hours.
Evaluating high-durability titanium and high-purity aluminum alloys to meet the weight reduction demands of high-range electric vehicles.
Discover our selection of industrial screws, custom wing nuts, washers, and specialized drywall anchors.
Dongshuo Fasteners supplies high-volume distributors and industrial projects worldwide. We ensure that our shipments comply with importing regulations, documentation protocols, and performance testing standards.
Our quality verification lab performs regular checks to ensure structural consistency across batches:
To preserve structural integrity during oceanic transport, products are shipped in moisture-resistant bulk packaging, shrink-wrapped on standard pallets, and labeled with heat numbers for batch traceability.
We work closely with logistics partners to ensure customs clearances meet import rules in Europe, North America, the Middle East, and Southeast Asia, streamlining direct-to-site delivery.
Detailed technical answers addressing common inquiries about standard requirements, thread properties, and surface treatments.
Dongshuo Fastener
