Established in 2006, Sinsun Hardware is a leading manufacturer and global supplier of high-quality fasteners and clamping systems. As Northern China's largest producer of Self-Tapping Screws, 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 centres. Our yearly supply of over 8,500 containers consistently services key global markets such as the Middle East, Southeast Asia, South America, and Russia.
Leveraging this engineering superiority, Sinsun Hardware has developed a premium line of Stainless Steel Ear Clamps (both single ear and stepless variants). Engineered specifically for high-integrity connections, our ear clamps provide the uniform, leak-free seal required in demanding industrial environments.
Traditional worm gear clamps can cause uneven force distribution and localized stress points. Our Stepless Stainless Steel Ear Clamps feature a patented internal tongue-in-groove design, eliminating steps or gaps on the inner circumference. This guarantees a continuous, uniform 360° seal on the hose or pipe, perfect for soft or hard plastics and rubber hoses.
We source premium steel grades exclusively from world-class mills like XING TAI Steel. Our ear clamps are cold-formed from high-tensile AISI 304 and AISI 316 stainless steel. AISI 316 offers ultimate resistance against marine environments, chlorides, and acids, exceeding 1,000+ hours of continuous salt spray testing without oxidation.
Thermal expansion and contraction can cause typical fasteners to fail. The elastic spring-back properties engineered into Sinsun’s ear design act as a constant tensioner. As temperature fluctuations cause the hose to expand or contract, the ear clamp compensates dynamically, preserving seal integrity at high pressures (>1,000 MPa tensile strength).
Single Ear Clamps: Best suited for applications involving thin-walled hoses and semi-rigid plastics. The localized single ear allows for fast installation with manual or pneumatic crimping pincers, providing high radial force over a targeted area.
Double Ear Clamps: Feature two crimping ears situated 180 degrees apart. The second ear provides a wider clamping range and increased dynamic clamping force, allowing it to adapt to significant hose diameter changes under high pressures.
Our production prowess is driven by German-imported multi-station cold heading machinery, precision Taiwanese technology, and a dependable staff of trained specialists. We offer over 20,000 SKUs of nails, screws, wires, clamps, and rivets, each undergoing 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).
We specialise in offering unique fastening solutions that are tailored to your specific needs. Our technical team works directly with clients from design to manufacturing, providing support for unusual materials, coatings, dimensions, and performance requirements to ensure that each custom order matches exact specifications.
We guarantee reliable and rapid lead times for both standard and special orders by using our integrated facility, optimised inventory, and effective planning. Sinsun Hardware is your strategic partner, committed to delivering quality, innovation, and on-time performance worldwide.
Explore our journey of expansion, from establishing exports in 2012 and integrating German technology in 2018, to achieving a 36,000-ton annual output and adding advanced heat treatment lines by 2025.
At SINSUN, our quality control begins at the source. We start with premium raw materials from XING TAI Steel, then perform in-house spheroidizing annealing and precision wire drawing in our own plant. This end-to-end control, supported by our advanced drawing machines and gas-fired furnaces, ensures superior microstructure, consistency, and performance in every fastener we produce.
We treat high-carbon and stainless alloy coils in specialized gas-fired annealing furnaces to eliminate internal stresses and enhance ductility. This microstructural optimization ensures that the steel does not crack during aggressive cold-crimping processes.
By controlling the cold-drawing process, we ensure dimensional tolerances as tight as ±0.02mm. Perfect cross-sectional consistency prevents thickness variances in our ear clamps, securing reliable pressure distribution.
SINSUN operates four dedicated in-house heat treatment lines. By controlling the heating and quenching times under protective atmospheres, we achieve a consistent surface hardness of HRC 28-32, offering high strength without brittleness.
Critical fluid pathways, including EV coolant loops, air conditioning hoses, transmission oil lines, and fuel delivery lines, require permanent, vibration-resistant seals. Our stainless steel ear clamps resist corrosion under the hood and survive rigorous continuous engine thermal cycles.
For municipal, commercial, and residential water piping, our stepless ear clamps provide rapid, gas-tight seals on PEX tubing. Engineered to withstand high hydraulic pressure pulses, they ensure decades of rust-free performance under floorboards and inside walls.
Cleanliness and chemical compatibility are vital in hygienic piping. By employing non-toxic AISI 316 grade stainless steel with high polish finishes (Ra ≤ 0.4μm), Sinsun clamps do not trap bacteria or corrode under acidic CIP (Clean-in-Place) washdowns.
Global supply chains frequently face raw material shortfalls and logistics backlogs. Sinsun manages these risks with our 12,000 sqm smart warehouse, which holds a buffer of 18,000+ pallets. This enables us to maintain a stable cost structure and dispatch urgent client shipments within days, insulating partners from short-term market volatility.
Situated in Northern China's industrial manufacturing heartland, Sinsun Hardware maintains direct transport pipelines to major deepwater container ports (including Tianjin/Qingdao). Feeding over 8,500 shipping containers per year into global maritime routes, we minimize domestic transit delays and reduce global freight costs.
Automotive designers are targeting weight reduction to maximize EV range. Sinsun is developing ultra-thin, high-tensile alloy steel bands that reduce total component weight by up to 15% while maintaining the radial sealing force of thicker bands.
To eliminate installer error in automated assembly lines, we are working with tool manufacturers to design ear clamps optimized for pneumatic pincers with digital force-feedback sensors. This ensures that every crimping cycle falls within nominal limits, tracking quality in real time.
Sinsun is committed to reducing environmental impact. Our facility is transitioning to clean energy sources, utilizing waste heat from our annealing ovens to heat local plant operations. We are also working toward ISO 14001 carbon reduction certifications by 2026.
Operating in global markets requires compliance with local environmental and quality standards. Sinsun Hardware ensures that our stainless steel products adhere to strict international regulatory frameworks, facilitating smooth customs clearance and compliance checks.
Our stainless steel ear clamps are free from lead, mercury, cadmium, hexavalent chromium, and other hazardous chemicals, meeting all requirements for import into European markets.
All Sinsun clamps are manufactured to comply with DIN 1.4301 / AISI 304 and DIN 1.4401 / AISI 316 specifications, ensuring they meet the mechanical property standards expected by European and North American engineers.
We provide localized labeling, barcoding (UPC/EAN), and 3D preview box designs for retail and industrial distribution, streamlining the process from warehouse arrival to store shelves.
For procurement officers managing bulk contracts, Sinsun Hardware offers a streamlined purchasing process. We provide comprehensive mill test certificates (MTC) with each shipment, showing the chemical composition and mechanical properties of the steel batch. We also support flexible payment terms, localized freight forwarding arrangements (FOB, CIF, DDP), and custom packaging formats to minimize receiving labor at your distribution centers.
Stepless Ear Clamps offer a continuous, gap-free seal around the entire circumference. Worm gear clamps have a flat section under the screw housing that can create a leak path on small-diameter hoses. Stepless ear clamps are also lighter, resist tampering, and withstand vibration much better than threaded clamps.
AISI 304 is the industry standard, offering excellent mechanical properties and solid corrosion resistance for automotive and general industrial applications. AISI 316 contains molybdenum, which provides superior resistance to chlorides and pitting, making it the best choice for marine environments, coastal infrastructure, and chemical processing.
No, ear clamps are designed for single-use applications. During installation, the ear is permanently deformed to apply tension. If the clamp is pried open or cut for hose replacement, it must be replaced with a new clamp. This single-use design ensures that the clamping tension does not degrade over time.
Measure the outer diameter (OD) of the hose after it has been pushed onto the fitting or barb. Select an ear clamp size where the nominal closed diameter is slightly smaller than the hose assembly's OD, and the open diameter is large enough to slip over the assembly easily.
You can use standard manual crimping pincers for low-volume assembly or maintenance. For high-volume production, we recommend using pneumatic pincers, which ensure consistent crimping force and speed up assembly.
We process our raw materials in-house (spheroidizing annealing and wire drawing) to insulate our production costs from external steel market fluctuations. Additionally, our 12,000 sqm smart warehouse allows us to maintain a buffer of finished components, helping us stabilize pricing and delivery schedules.
