We have formulated the most stringent sampling inspection system, utilizing digital profiling, ultrasonic testing, and automated optical sorting so as to strive to achieve zero defects for all products out of our factory.
Innovation drives our metallurgy department. At present, our entire group holds more than 100 utility model patented products and eight pioneering invention patented products, pushing boundaries in fastener resilience.
Scale matters in worldwide procurement. We currently operate nearly 100,000 product models, maintaining 500 tons of raw alloy materials in stock alongside 10,000 tons of finished stainless steel standard parts for immediate export.
Beiersdorf Industrial Technology (Shanghai) Co., Ltd. was established in 2015 and is located in the global industrial hub of Shanghai, China. Over the past decade, we have established ourselves as a premier enterprise specializing in the custom design, manufacture, and distribution of high-end special fasteners and ultra-high precision components.
"Product quality is the foundation for an enterprise's survival."
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Carriage bolts, characterized by their smooth rounded dome heads and integrating square neck designs underneath, serve as fundamental mechanical locking elements in high-vibration and structural security applications. The square neck is specifically engineered to sink into a pre-drilled round hole or a square slot, establishing an automatic mechanical interference lock when tensioned. When the corresponding nut is tightened, the carriage bolt remains locked in place without requiring external turning tools on the head. This dual-purpose mechanism prevents rotation and enhances security since the dome-shaped external head offers no purchase for manual tampering or mechanical disassembly from the outside.
Our specialized production facility manufactures carriage bolts under rigid dimensional tolerances following international standards including DIN 603, ISO 8677, and ASME B18.5. By choosing advanced cold heading and hot forging techniques depending on the diameter size (ranging from M5 to M36 and beyond), we guarantee exceptional grain-structure alignment through the head-to-shank transition zone. This structural integrity maximizes the bolt's load capacity and resistance to shear stresses.
Standard fasteners fail in corrosive environments. We specialize in producing carriage bolts from premium stainless steel grades designed to withstand targeted environmental stressors:
As a premier supplier based in Shanghai, Beiersdorf capitalizes on China's massive industrial infrastructure. Our location allows us to consolidate raw materials efficiently and coordinate immediate shipping through the Port of Shanghai. This supply chain layout benefits global buyers through:
Our facility carries more than 500 tons of specialized raw steel alloys, hedging against volatile market pricing and enabling us to offer stable, cost-competitive manufacturing rates to international distributors.
From CAD design to automated cold heading machines and multi-station thread-rolling setups, we scale from small custom runs to high-volume commercial production batches without sacrificing structural tolerances.
Every shipment is tracked via batch numbers, offering raw material traceability and comprehensive chemical test validation reports. Our goal is 100% compliance with international design parameters.
Procuring industrial fasteners from overseas requires absolute alignment with regulatory codes. Our carriage bolts and precision components meet rigorous criteria to guarantee smooth entry into North American, European, and Asia-Pacific markets:
The fastener industry is shifting toward digitalization, ecological neutrality, and structural health monitoring. Beiersdorf is actively investing in technologies to support these macro trends:
Our specialized fasteners are widely used in shipbuilding and oceanography engineering, specifically in manufacturing specialty marine vessels, propulsion systems, yacht assemblies, offshore oil rigs, submarine pipes, and coastal wind farms. Materials utilized include A4-80, A5-80, Duplex 2205, Super Duplex 2507, 718, and classification society certificate fasteners.
High-vibration power generation settings demand exceptional creep resistance. We supply specialized carriage bolts for thermal power plants, wind turbines, gas turbines, and structural grid components, engineering them to maintain secure connections under intense dynamic stress profiles.
High-speed passenger trains and heavy cargo rail networks experience continuous cyclic load profiles. Our structural steel connections and certified classification fasteners provide consistent clamp force, preventing fatigue failure across railway networks.
Advanced electronics call for lightweight, non-magnetic, and dimensionally accurate assembly hardware. We manufacture micro-sized carriage bolts and precision parts from high-purity non-magnetic stainless steel, plastics, and titanium to safeguard signal pathways.
Refining plants route volatile chemicals through pipelines at elevated temperatures. Our high-temperature and chemical-resistant fasteners withstand hydrogen gas, sulfuric acid, and chloride attacks, preserving critical fluid connections.
Maintains ductility, impact toughness, and mechanical stability in cryogenic environments.
Ultra-lightweight structural parts exhibiting outstanding strength-to-weight ratios.
Excellent wear, abrasion, and cavitation resistance for demanding hydraulic configurations.
Excellent high-temperature resistance to oxidation, carburization, and chemical acid exposures.
High-volume standard carriage bolts, studs, and custom anchors trusted by global distributors.
Ultra-high-strength fasteners built for heavy load-bearing structural joints.
Engineered to maintain structural integrity in aerospace engines and high-heat furnaces.
A2 stainless steel (typically Grade 304) is the most common form of stainless steel used for general-purpose fasteners, providing reliable corrosion resistance in non-acidic and dry environments. A4 stainless steel (Grade 316) contains an additional 2-3% Molybdenum, which increases its resistance to pitting and crevice corrosion in marine environments, chloride solutions, and industrial chemical processing plants.
The square neck of the carriage bolt is designed to fit into a matching square slot in steel plates, or to bite directly into soft wood structures as the nut is tightened. This mechanical lock stops the bolt from turning when torque is applied to the hex nut on the opposite side.
The primary international standards governing carriage bolts are DIN 603 (European metric standard), ISO 8677 (International standard for round head square neck bolts), and ASME B18.5 (American standard for carriage and step bolts). These standards define thread pitches, head heights, square neck dimensions, and mechanical limits.
To ensure industrial-grade quality and safety compliance, buyers should verify the supplier's ISO 9001:2015 Quality Management certification, require EN 10204 Type 3.1 Mill Test Certificates (MTRs) for chemical and physical traceability, and check for CE markings, RoHS, and REACH compliance.
Yes, carriage bolts are suitable for high-vibration environments when paired with locking components like nylon-insert lock nuts (Nyloc), spring washers, or thread-locking adhesives. The square neck prevents the bolt body from rotating, which helps stabilize joint tension.
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Beiersdorf (Shanghai) was founded in 2015. We are a company with a global perspective dedicated to providing professional fastener solutions. Fasteners, as the most basic and common mechanical pa...
Beiersdorf is more than an industrial hardware vendor; we provide end-to-end consulting, material grade selection assistance, load calculations, custom profile development, and post-installation support. Contact our engineering team today for technical guidance.
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