Established in 2006, Sinsun Hardware has grown from a specialized manufacturer to a global leader in high-performance fastening technologies. Operating out of our state-of-the-art 30,000 m² integrated production base in Northern China, we leverage German engineering principles and Taiwanese precision systems to service the automotive, civil construction, maritime, and electronic engineering sectors worldwide.
Our infrastructure includes a fully digitized 12,000 m² smart warehouse boasting a capacity of 18,000+ pallets, enabling automated inventory tracking and dispatch. Annually, we ship over 8,500 containers across critical markets in the Middle East, Southeast Asia, South America, Russia, and Europe, maintaining strict quality conformance in every batch.
Neoprene fender washers represent a critical boundary layer between structural fasteners and vulnerable surfaces. Combining the mechanical surface-area load distribution of a metal fender washer with the sealing, non-conductive, and shock-absorbing properties of synthetic polychloroprene, these components protect installations against corrosion, structural wear, and moisture ingress.
In coastal and maritime environments, electrochemical galvanic corrosion is a constant threat. Sinsun's ODM Neoprene Washers act as a physical barrier separating dissimilar metals (such as stainless fasteners and aluminum cladding), cutting off ionic electrical pathways and guaranteeing airtight seals against saltwater intrusion.
Large-span roofing sheets undergo continuous thermal expansion and contraction cycles. Our washers provide elastomeric elasticity to adjust to metal movements without micro-fracturing structural layers. The vulcanized neoprene washer forms a tight seal around the screw shaft, keeping roofing panels completely waterproof.
Vibration fatigue causes joint loosening and structural failure in moving assemblies. The viscoelastic core of our polychloroprene rubber layer absorbs high-frequency vibrations from engine compartments and suspension setups. This protects delicate localized substrates and prolongs the lifespan of structural joints.
Neoprene, synthesized through the emulsion polymerization of chloroprene, is a robust multi-purpose elastomer. Unlike natural rubber, it offers balanced physical resistance to petroleum-based oils, acids, ozone, UV radiation, and general environmental weathering.
The rubber layer on our washers is formulated with a Shore A durometer hardness of 60 to 70. This density profile ensures the neoprene provides excellent mechanical resistance against compression set while remaining flexible enough to conform to uneven metallic surfaces.
When fastening aluminum cladding using carbon-steel or stainless-steel screws, moisture creates a micro-galvanic cell. The neoprene backing physically breaks this circuit, preventing accelerated galvanic corrosion.
When tightened to specification, the neoprene layer flows radially under the metal backing to fill voids, creating a reliable low-pressure barrier against gas and liquid leaks.
Founded with a singular specialization: establishing Northern China's modern base for high-performance self-tapping fasteners.
Formed the dedicated Global Export Division, distributing custom fastening solutions to international distributors and industrial users.
Achieved full vertical integration by installing raw material spheroidizing furnaces and wire-drawing infrastructure for absolute quality control from source wire rods.
Upgraded precision capabilities with German-imported multi-station cold heading systems and specialized Taiwanese tail-gripping machines.
Annual structural output hit 36,000 tons, sending over 1,100 high-capacity export containers worldwide.
Inaugurated our 12,000 m² smart distribution warehouse, keeping high-volume standard SKUs constantly in stock for immediate shipment.
Integrated 4 cutting-edge heat-treatment lines to ensure uniform case hardness, high core strength, and optimized torque ratings.
In modern manufacturing, supply chain stability is just as important as engineering specifications. Industrial operations face challenges due to fluctuating metal prices, rising logistics costs, and strict environmental regulations (such as the EU's RoHS and REACH directives).
Sinsun Hardware addresses these challenges by sourcing raw steel directly from national mills like Xing Tai Steel. By performing spheroidizing annealing and wire drawing in-house, we eliminate intermediate processing costs and stabilize supply timelines for our international partners.
Our facilities use advanced bonding technology to secure the neoprene seal to its metal backing, preventing ring separation during high-torque power installations. This reliability reduces installation errors, helping OEMs avoid costly project delays.
To align with global sustainability goals, Sinsun's engineering division is testing bio-based synthetic monomers to replace petroleum-derived chloroprene. These materials aim to maintain standard physical sealing properties while significantly reducing carbon footprints.
We are researching piezo-chromic coatings for neoprene materials. These coatings change color when specific target torque forces are applied, allowing assembly lines to quickly verify correct installation tension visually.
By blending fluoropolymer elastomers with polychloroprene, Sinsun is developing washers that withstand temperatures up to +200°C for demanding aerospace and heavy industrial applications.
Neoprene (polychloroprene) offers balanced resistance to oils, greases, and chemicals that would degrade natural rubber or EPDM. EPDM excels in high-heat weather-exposed structural joints, whereas neoprene is preferred for industrial applications exposed to hydrocarbons, oils, and physical abrasion.
We use a specialized heat-vulcanization bonding process. Rather than relying on simple adhesive films, the raw elastomeric compounds are vulcanized under heat and pressure directly onto the treated metal substrate, ensuring a permanent bond.
Yes. By separating carbon-steel or stainless-steel fastener heads from aluminum sheeting, the non-conductive neoprene layer prevents galvanic corrosion in outdoor environments.
We customize the metal core (carbon steel, 304/316 stainless steel, copper), backing thickness, and outer diameter, alongside neoprene variations tailored for high-temperature or oil-rich environments.
Our neoprene compounds include specialized carbon black stabilizing additives, offering a service life exceeding 15 years in typical outdoor conditions without significant cracking.
We manufacture in strict compliance with DIN, ISO, and ASTM tolerances, keeping dimensional variations within ±0.02 mm to ensure a proper fit.
Yes. All materials are tested to ensure they are free of hazardous substances, complying with REACH and RoHS standards for international markets.
Torque limits depend on the screw size and metal backing. We recommend tightening until the neoprene layer begins to compress slightly but does not bulge beyond the edge of the metal washer.
Yes. We offer custom cartons, retail blister packs, barcodes, and custom labelling to suit your distribution needs.
Our smart warehouse maintains a safety stock of standard sizes, allowing us to process and ship orders quickly through major ports like Tianjin.
