High-performance anchoring, clamping, and fastening lines manufactured directly in our integrated facility.
Double ear clamps, frequently referred to in mechanical engineering as pinch clamps or Oetiker-style hose rings, play a critical role in fluid and pneumatic power transmission systems worldwide. Built with dynamic radial thermal expansion compensation, these components feature twin ear structures that act as a dual spring mechanism. This unique design provides a continuous, highly uniform concentric crimping pressure around hoses that other standard screw-based clamps cannot achieve.
Across the Americas, Europe, and Asia-Pacific regions, industrial pipelines rely heavily on these clamps for permanent sealing applications. The global commercial market has observed a substantial uptick in double ear clamp adoption due to their tamper-proof nature and quick-installation profiles. Major sectors such as automotive OEM lines, industrial chemical transport, food and beverage processing, and high-vibration off-road machinery rely on the reliable performance of these components to prevent costly leaks and downtime.
Established in 2006, Sinsun Hardware has grown into a leading manufacturer and global supplier of high-quality fasteners and fluid connection solutions. As Northern China's largest producer of Self-Tapping Screws and precision mounting solutions, we operate from a gigantic 30,000 sqm integrated facility that includes modern production zones, a 12,000 sqm smart warehouse (18,000+ pallet capacity), and multi-language customer support centers. Our yearly supply of over 8,500 containers consistently services key global markets such as the Middle East, Southeast Asia, South America, and Russia.
Our production prowess is driven by German-imported machinery, precision Taiwanese technology, and a dependable staff of trained specialists. We offer over 20,000 SKUs of nails, screws, wires, rivets, and specialty clamps. Each clamp undergoes 12+ stringent quality checks to assure outstanding polish (Ra ≤ 0.4µm), corrosion resistance (1,000+ hours salt spray), dimensional accuracy (±0.02mm), high strength (1,000+ MPa), and consistent hardness (HRC 28-32).
How Sinsun Hardware integrates premium domestic raw materials and advanced automation to deliver cost-effective global supply chains.
We combine over 200 German-imported multi-station cold heading machines (producing 1,200+ pieces/min/machine) and 4 dedicated in-house heat treatment lines (20-ton/day capacity) to guarantee superior product quality, strength, and durability with a fatigue life exceeding 50,000 cycles.
Core steel is sourced directly and exclusively from Ansteel Group (utilizing over 10,000+ tons/year of high-grade C1022A carbon steel and certified premium grade stainless steel coils). Quality control starts at the source with in-house spheroidizing annealing and wire drawing.
Our 12,000 sqm packaging warehouse enables 24/7 operations with automated sorting (3,000+ cartons/hour) and direct container loading (50+ TEUs/day). This seamless ERP logistics integration ensures rapid delivery of custom orders and bulk standard configurations alike.
From Sinsun's founding in 2006, the company has grown into a leading Chinese fastener manufacturer. Explore our journey of expansion, technological integration, and capacity increases.
Sinsun Hardware was founded, setting up its first manufacturing plant in Northern China to fulfill growing regional demands for construction screws and hardware.
Began global trade relations, establishing key distribution pipelines in South America, the Middle East, and Russia, expanding the facility to 15,000 sqm.
Installed automated cold heading machinery from Germany and high-precision thread rolling units from Taiwan, elevating tolerances to ±0.02mm.
Expanded to a 36,000-ton annual output with state-of-the-art continuous heat-treatment furnace lines and strict in-house eco-passivation systems.
We guarantee full transparency and absolute control from the incoming wire rods to the final packaged containers.
Wire rods from Xingtai Steel undergo strict spheroidizing annealing.
High-speed multi-station machines forming fasteners and clamps.
In-house carburizing and tempering for high shear and tensile strength.
Automated inventory tracking covering over 18,000 pallet positions.
On-site testing laboratories and support centers for global clients.
Shipping logistics processing 8,500+ containers to international markets.
For industries where reliability is non-negotiable, Sinsun delivers certified security, precision, and partnership. As a specialist manufacturer, we provide end-to-end solutions for OEMs and distributors worldwide.
Technical Collaboration: Our engineering team works with your technical department to analyze structural loads, corrosion parameters, and mechanical limitations.
Prototyping & 3D Modeling: Rapid prototyping and detailed CAD/FEA simulation models validate clamp elasticity and fatigue profiles prior to high-volume manufacturing run approvals.
Cold Forging & Heading: High-volume fabrication using multi-stage cold headers to guarantee optimized grain flow within the material and achieve maximum shear strength.
Secondary Processing: Precise thread rolling, ear calibration, stamping, heat treating, and customized surface finishing in our integrated production facility.
Inspections: In-process optical sorting machinery inspects 100% of vital dimensions to eliminate micro-cracks and structural dimensional variances.
Laboratory Validation: Multi-axis tensile testing, micro-hardness testers, torque analysis, and saltwater spray test validation (meeting DIN/ISO specifications).
Precision radial sealing engineered for harsh environments and specialized commercial setups.
In automotive engine bays, rapid temperature variations cause hoses to expand and contract. The double-ear design acts as an active spring, maintaining constant clamping pressure to prevent dangerous fuel and glycol leakage.
High-pressure industrial pneumatic lines require secure coupling connections that do not degrade under constant cyclic pressure waves. Our double ear clamps securely grip polyurethane and rubber hoses to ensure long-term pressure integrity.
Utilizing high-purity Grade 316 Stainless Steel ear clamps, our solutions prevent contamination and resist sanitizing chemicals in carbonated beverage dispenser lines, commercial draft systems, and dairy pipelines.
A structured, six-step manufacturing workflow guaranteeing transparency, quality control, and on-time delivery.
Our sales engineers analyze your application, pressure limits, material needs, and vibration dynamics.
We generate precise 3D blueprints and provide transparent pricing and manufacturing timelines.
We manufacture physical sample batches for internal testing, pressure trials, and client approval.
Following sample approval, bulk production starts on our high-speed, multi-station cold heading machinery.
Every batch undergoes statistical process control checks for dimensional tolerances and salt-spray durability.
Finished items are stored in our smart warehouse and prepped for customs and maritime shipment.
Real-world engineering scenarios proving how Sinsun Hardware's custom fastening and clamping products solve critical field issues.
Challenge: A tier-1 automotive customer experienced fluid leaks in their turbocharger bypass cooling loop due to standard worm-drive clamps loosening under engine heat cycles.
Sinsun Solution: We manufactured a custom, heavy-duty stainless-steel ear clamp engineered to maintain tension at temperatures up to 250°C. Our metallurgy team customized the annealing cycle to optimize elastic tension recovery.
Result: Passed a 2,000-hour thermomechanical vibration testing cycle with zero pressure drops, resulting in a 15% reduction in overall connection weight.
Challenge: An offshore oil platform contractor needed structural connections capable of resisting highly corrosive maritime splash zones without experiencing stress corrosion cracking.
Sinsun Solution: Developed special-grade duplex stainless steel fasteners with specialized passivation treatments, verifying corrosion resistance through extended environmental testing.
Result: Over 1,200 hours of continuous saltwater spray testing completed with zero red rust formations, meeting demanding marine regulatory requirements.
Find answers to technical specifications, ordering procedures, and custom ODM design questions.
Double ear clamps have a wider dynamic range to accommodate hose expansion and contraction caused by temperature fluctuations or pressure changes. The twin ears act as two opposing springs, applying symmetrical force around the circumference of the hose. This design provides more consistent pressure than single ear clamps, especially on thicker or stiffer hose materials.
Yes. As a direct manufacturer, we offer complete OEM and ODM customization. Our technical team can customize ear widths, band thicknesses, and diameters according to your drawings or physical hose samples. We also offer specialty materials (e.g., SS316, SS304, or galvanized carbon steel) and custom surface coatings to meet specific requirements.
Double ear clamps require a specialized mechanical or pneumatic crimping tool (ear clamp pincers) to crush the ears. Proper installation occurs when the ear is compressed to a predefined gap. This ensures uniform radial compression without damaging the underlying hose. Crimping creates a permanent, tamper-resistant seal that cannot be uninstalled without cutting the clamp.
Our raw steel is sourced directly from Ansteel Group and Xingtai Steel. We run our own wire drawing and spheroidizing annealing processes in-house to ensure material consistency. Our quality department performs multi-stage testing including chemical analysis, micro-hardness checks, dimension verification (within ±0.02mm), and salt spray corrosion testing exceeding 1,000 hours.
Our minimum order quantities are flexible depending on standard stock availability and customization requirements. For standard catalog dimensions, the MOQ is low, and shipments can be dispatched quickly. Custom ODM projects generally require 4 to 6 weeks for design, tooling preparation, sample validation, and manufacturing.
No. Ear clamps are designed as permanent, tamper-proof connection solutions. Once crimped, the ears undergo plastic deformation to maintain clamping force. To remove them, the clamp must be cut using side cutters or pincer tools. This design ensures that the connection remains secure and does not loosen under vibration or high-pressure cycles.
High-performance anchoring, clamping, and fastening lines manufactured directly in our integrated facility.
Your project deserves a fastener partner who understands the critical link between a single component and overall system integrity.
SINSUN
