Explore our industrial-grade catalog designed to secure high-torque assemblies, structural joints, and vibration-prone system components.
Handan Yongnian District Dongshuo Fastener Manufacturing Co., Ltd. was established in 2015. It is an enterprise specializing in the production and operation of fasteners. Our company is committed to providing high-quality fastener products and providing customers with comprehensive solutions in various industries. As a reputable fastener manufacturer, we have advanced production equipment and a professional technical team to meet our customers' needs for different types of fasteners.
Spring pins, frequently denoted as tension pins, roll pins, or expansion sleeves, represent an indispensable class of self-retaining mechanical fasteners. By leveraging the fundamental elasticity of heat-treated metals, these components exert continuous radial pressure against the internal boundaries of a host hole. Unlike solid pins or dowels that rely on precise interference fits requiring micro-toleranced machining, spring pins accommodate wider host-hole tolerances while maintaining dynamic resistance to rotational and lateral displacement.
Did You Know? The dynamic retention capability of spring pins is governed by Hooke's Law of Elasticity under radial compression. When inserted into a hole slightly smaller than the pin's free diameter, the potential energy stored in the compressed steel cylinder forms an active joint capable of absorbing multi-axial shock loads.
In high-torque industrial systems, spring pins function either as permanent positioning anchors or sacrificial shear components designed to prevent catastrophically high loads from damaging driving shafts. The selection between different geometry configurations—specifically Slotted Spring Pins versus Coiled Spring Pins—is critical for structural integrity:
At Handan Yongnian District Dongshuo Fastener Manufacturing, the physical and operational performance of our spring pins is deeply connected to metallurgical composition. Choosing the correct substrate alloy determines the fatigue limit, yield strength under shear stress, and service lifespan under corrosive conditions.
| Material Class | Common Designation | Shear Resistance | Corrosion Resistance | Optimal Application Environment |
|---|---|---|---|---|
| High-Carbon Spring Steel | 65Mn / C67S / SAE 1070 | Exceptional | Moderate (requires coating) | Heavy Machinery, Automotive Chassis, High-Torque Drives |
| Stainless Steel (Austenitic) | SUS304 / A2 / AISI 304 | Standard | High | Food Processing, Marine Enclosures, Chemical Apparatus |
| Stainless Steel (Martensitic) | SUS420 / AISI 420 | High | Moderate-High | Aviation Components, Petrochemical Valves, Precision Gearboxes |
| Alloy Steel | 51CrV4 / AISI 6150 | Extreme | Low (greased) | Extreme shock-load military and aerospace machinery |
Beyond material choice, the hardening phase (heat treatment) is critical. If spring pins are under-tempered, they risk permanent deformation (loss of spring-back force); if over-hardened, they run the risk of hydrogen embrittlement or sudden brittle fractures under heavy shear loads. Dongshuo Fastener uses computer-controlled atmospheric heat-treatment belts to guarantee uniform hardness (ranging from 420 to 560 HV depending on material and application spec).
Handan Yongnian District is internationally recognized as the fastener capital of China. By leveraging this vast industrial cluster, Dongshuo Fastener offers global buyers unmatched manufacturing and logistical advantages:
Proximity to regional steel mills allows us to source premium wire coils with certified chemical tracing. This reduces transit times and eliminates raw material supply volatility.
From design, tooling, cold-forming, and high-speed roll manufacturing to automated heat treatment, optical sorting, and surface coating—every phase is managed under one unified quality management standard.
Industrial concentration allows us to run high-volume production lines with minimal setup costs. This passes significant cost savings directly to international procurement teams through direct-factory pricing.
Spring pins are simple yet essential components across many key global industries:
Modern vehicles use spring pins in steering columns, shifting forks, and differential gears. Their elastic properties absorb engine vibrations, protecting critical components from loosening over hundreds of thousands of duty cycles.
Miniaturized coiled pins (often down to 0.8mm in diameter) are used in hinges, connectors, and switch mechanisms. Here, the challenge is maintaining precise insertion forces to avoid cracking delicate plastic or glass-reinforced composites.
Used as rugged linkage connections in plows, harvesters, and excavators. The pins must handle continuous exposure to abrasive dust, moisture, and extreme shock loads. Under these conditions, mechanical galvanization or thick-film zinc-nickel plating is used to prevent environmental corrosion.
For international supply chain managers and procurement officers, sourcing fasteners from overseas factories involves managing risks around dimensional consistency, delivery schedules, and compliance standards.
To address these concerns, Dongshuo Fastener uses automated optical sorting machines to inspect every batch. Any pin with structural defects, deviations in diameter, or length variances outside standard tolerances is flagged and separated. In addition, we supply complete chemical and physical analysis reports—including raw material ladle analysis, hardness profiles, and salt-spray test results—with every shipment.
We are committed to providing high quality fastener products and comprehensive industry solutions.
The price is negotiable. It can be changed according to your quantity or packaging.
The sample requires a sample fee, which can be paid on delivery or you can pay us the fee in advance.
All of our products are made of high-quality environmentally friendly materials.
We can adjust it according to your requirements.
You can send your own design and logo. We can open new molds and logos, and then send samples for confirmation.
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Take a closer look at our physical facility, showcasing our cold heading machinery, rolling mills, storage zones, and quality assurance labs.
We are committed to providing high quality fastener products and comprehensive industry solutions.
Review our comprehensive FAQ catalog covering procurement details, custom design queries, and technical installation guides.
Handan Yongnian Dongshuo Fastener Manufacturing Co., Ltd.
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