Explore our primary range of heavy-duty industrial bolts, washers, and custom fasteners manufactured to rigorous international standards (DIN, ASME, ISO, GB) and engineered for optimal torque and tension distribution.
Hex Head Bolts (often termed Hex Hd Bolts or Hex Cap Screws) serve as the fundamental mechanical anchors binding global industries. From the assembly lines of premium automotive brands to the complex framing configurations of structural civil engineering, hex head bolts provide the required clamping force and shear resistance to assure lifetime mechanical integrity. Over the past decade, the global fasteners market size has expanded rapidly, fueled by massive investments in infrastructure modernization, renewable energy installations, and commercial transportation sectors.
Modern engineering demands strict conformance to precise physical tolerances and material properties. Leading structural engineering firms no longer view fasteners as mere commodities; they are defined as mission-critical safety components. Consequently, international regulatory standards such as ISO 898-1, ASTM A325 / A490, and DIN 931 / 933 specify rigorous chemical compositions, mechanical stress ceilings, and elongation percentages. Fastener manufacturers must implement complex thermo-mechanical metallurgy treatments to achieve grades like 8.8, 10.9, and 12.9 to safeguard assemblies against structural shear fatigue and sudden tensile failures.
Multi-modal distribution setups ensure heavy cargo flows rapidly from the production floors of East Asia directly to distribution hubs in Rotterdam, Houston, and Hamburg, minimizing lead times and container handling overheads.
Complete traceability systems tracing every hex head bolt batch from raw steel wire rod selection up to ultimate tensile strength tests, satisfying all strict requirements of European and American safety directives.
By employing modern multi-station cold heading machinery, output scales are maximized while dimensional deviation margins are restricted within sub-millimeter scales for complete consistency.
For nearly a decade, Handan Yongnian District Dongshuo Fastener Manufacturing Co., Ltd. has stood as a pioneer in the global fastener engineering industry. Located in Yongnian, Hebei Province—the legendary heart of China's fastener supply chain—our enterprise specializes in the high-fidelity production, custom engineering, and worldwide distribution of comprehensive anchoring and assembly solutions.
Our commitment to quality is backed by advanced automated machinery and a seasoned technical engineering division. We solve the most complex fastening challenges across multiple sectors, ensuring that every bolt, washer, flange system, and threaded shaft we manufacture meets international standards and helps clients build durable and safe structures.
Our strategic location in Yongnian District, Handan, Hebei Province, provides unique industrial advantages that we directly translate into superior quality and value for our global clientele.
Yongnian processes millions of tons of steel into finished fasteners annually. This immense scale aggregates premium raw material suppliers, specialized surface finishers, and mechanical testing centers in a single concentrated hub, minimizing operational delays.
With close proximity to China’s major steel production complexes, we secure high-grade carbon steel (ML08AL, ML35, 10B21, 35CrMo, 42CrMo) at optimal cost basis. This insulation from price volatility guarantees pricing stability for large-volume contract buyers.
Our facility is equipped with automated multi-station cold heading machinery. These setups combine wire feeding, straightening, cut-off, forging, and thread rolling in a continuous high-speed process, maximizing speed and consistency.
High-tensile hex head bolts are key to ensuring stability in diverse applications globally. Depending on the mechanical stresses and corrosion parameters of the installation environment, selection of the proper steel alloy and surface treatment is critical:
In structural steel construction, A325 and A490 high-strength heavy hex structural bolts are tensioned to produce high clamping forces. This ensures joint load is transferred by friction between the contact surfaces rather than sheer force on the bolt body.
Vehicle powertrains and chassis structures require fasteners that resist vibration loosening. Combining DIN 6921 Hex Flange Bolts with DIN 127 Spring Washers ensures persistent locking pressure under continuous dynamic shocks.
Wind turbines, marine rigs, and coastal infrastructure are exposed to high humidity and salinity. Utilizing hot-dip galvanized (HDG) or zinc-nickel electroplated coatings provides long-term barrier protection against oxidation.
To assist your engineering team in choosing the correct specifications for your procurement needs, we have tabulated the properties of standard grades:
| Property Class | Material Composition | Nominal Tensile Strength (N/mm²) | Yield Strength (N/mm²) | Recommended Coating | Typical Applications |
|---|---|---|---|---|---|
| Class 4.8 / 5.8 | Low/Medium Carbon Steel | 400 / 500 | 320 / 400 | Bright Zinc / Yellow Zinc | General hardware, framing, light machine brackets |
| Class 8.8 | Medium Carbon Steel, Quenched & Tempered | 800 | 640 | Hot-Dip Galvanized / Geomet | Structural engineering, medium machine manufacturing |
| Class 10.9 | Alloy Steel (e.g., 40Cr, 10B21), Quenched & Tempered | 1040 | 940 | Black Oxide / Zinc-Nickel | High-stress structural connections, heavy machinery |
| Class 12.9 | Alloy Steel (e.g., 35CrMo, 42CrMo), Quenched & Tempered | 1220 | 1100 | Phosphated / Custom Anti-corrosion | Engine cylinders, aerospace assemblies, high-tension dies |
The industrial fastener industry is shifting toward smart, high-performance designs. To maintain our position as a leading global manufacturer, Dongshuo Fastener continues to invest in emerging technological solutions:
With tightening environmental regulations worldwide, trivalent zinc coatings, zinc-nickel plating, and organic barrier finishes (such as Geomet and Dacromet) are replacing hexavalent chromium processes. These new coatings deliver high corrosion resistance with zero toxic waste footprint.
High-stress applications are starting to use bolts with built-in sensors. These "smart bolts" monitor real-time clamping tension and preload stress, notifying plant operators of any loosening before mechanical failures occur.
High-strength steel fasteners (Class 10.9 and above) are susceptible to hydrogen embrittlement during acid cleaning. We employ advanced mechanical descaling and precise baking cycles immediately after plating to relieve hydrogen stress and secure structural reliability.
A look at our factory floor, packaging processes, and specialized fastener catalog.
We deliver high-quality products and provide comprehensive, technical fastening solutions tailored to the needs of engineering and procurement teams worldwide.
All prices are quoted directly from our production site. Volume discounts are structured based on total metal weight, manufacturing stages, and chosen packaging styles.
We provide sample shipments to support pre-procurement validation. Clients can run laboratory verification on chemical composition, thread precision, and mechanical tolerances prior to batch production.
Our raw steels are sourced from eco-certified smelting mills. All zinc plating, phosphating, and organic treatments comply with RoHS and REACH environmental guidelines.
We process both large global infrastructure orders and custom-sized specialty batches, scaling our production lines to meet specific buyer demands.
Our engineering division creates tooling and molds based on your proprietary technical drawings. We supply custom prototypes to verify fit and performance in complex assemblies.
From initial design to logistics tracking, our customer service and technical teams provide timely support and updates throughout the manufacturing cycle.
Our technical team is ready to discuss mechanical configurations, coating specifications, and target unit pricing. Let us assist you with your procurement needs.
Selected industrial fasteners built to exact standards for critical mechanical assemblies.
Engineered with a sharp point and hardened thread profile to speed penetration through gypsum boards and metal stud framing.
Provides high deflection force to maintain tight clamping preloads, helping prevent bolt loosening in heavy machinery subject to continuous vibrations.
Features a polymer insert that grips the bolt thread, resisting vibration-induced loosening under high dynamic stress.
Designed for double flange connections, structural pipe links, and industrial processing vessels.
Pre-assembled bolt-and-washer configurations designed to streamline integration on automated industrial assembly lines.
We are a direct manufacturer. Our factory is located in Handan, Hebei Province, China—a major global manufacturing hub for industrial fasteners. Operating our own facility allows us to directly manage quality control, coordinate production scheduling, and maintain competitive pricing.
Our production facility is based in Handan City, Hebei Province, China. We welcome site visits from prospective clients. Handan Airport is about a one-hour drive from our facility, and we can arrange pick-up transportation for visiting purchasing teams.
We do not publish a standard, static price list. Fastener pricing fluctuates with raw steel markets, global shipping rates, and order volumes. We prepare custom, competitive quotes based on current market conditions for each specific inquiry.
For orders under $1,000 USD, we require 100% advance payment. For orders exceeding $1,000 USD, we accept a 30% T/T deposit, with the remaining balance due before shipment. We process transactions in US Dollars (USD), Euros (EUR), and Renminbi (RMB).
We provide standard hardware samples free of charge. Prospective clients are responsible for international shipping fees, which can be handled using customer carrier accounts or paid to us in advance.
For fasteners grade 10.9 and higher, we minimize acid exposure during surface preparation. Post-electroplating, parts are placed in baking ovens for 4 to 8 hours to drive out trapped hydrogen before it can degrade the steel matrix.
We recommend using hex flange bolts with serrated undersides, or assembling standard hex bolts with spring lock washers. For critical assemblies, nylon-insert lock nuts or thread-locking compound can also be applied.
Browse our secondary selection of industrial washers, custom carriage bolts, and high-strength fasteners engineered to international requirements.
Handan Yongnian Dongshuo Fastener Manufacturing Co., Ltd.
We are ready to provide technical support and discuss production capabilities for your specific anchoring, fastening, and assembly requirements. Get in touch with our team for detailed product specifications, price quotes, and production timelines.
Dongshuo
