Mechanical Hardware

Industrial machinery is the backbone of modern economies, and reliable sealing plays a critical role in ensuring efficiency and minimizing downtime. Stainless Steel PTFE oil seals, manufactured by DEDE, are engineered for high-performance applications, particularly in motors, pumps, and gearboxes. Why Stainless Steel PTFE Oil Seals Are Essential Traditional rubber seals often fail in extreme environments due to high temperatures, chemicals, or pressure. However, stainless steel PTFE oil seals offer: High Chemical Resistance: PTFE material resists a wide range of chemicals, oils, and solvents. Heat Resistance: Capable of withstanding temperatures up to 250°C without compromising sealing effectiveness. Low Friction: Reduces mechanical wear and improves overall system efficiency. Extended Lifespan: Provides long-lasting protection, minimizing the need for frequent maintenance or replacement. These features make stainless steel PTFE oil seals ideal for systems that operate under extreme thermal, pressure, and chemical conditions. Key Industries Using Stainless Steel PTFE Oil Seals Pumps and Motors – Protect critical parts like bearings and shafts from contamination and leaks. Gearboxes and Transmissions – Ensure the smooth operation of rotating components and prevent oil leakage. Hydraulic Systems – Maintain system pressure while preventing external contaminants from entering. Aerospace and Marine – Ensure sealing integrity in high-pressure, high- performance applications. DEDE’s Comprehensive Sealing Solutions DEDE provides more than just oil seals — we offer a comprehensive approach to sealing system reliability: Standard Parts with Quick Shipment – Over 10,000 types of seals in stock for fast delivery worldwide. Fully Customizable Solutions – Tailor seals to meet the specific needs of your machinery and systems. Advanced Technical Support – Our team of experts works with you to optimize your sealing system and reduce operational costs. Why DEDE is the Trusted Choice As a leading global sealing solutions provider, DEDE has: 30+ years of experience in the sealing industry. Manufacturing capabilities that meet international standards. Extensive global distribution, ensuring that clients across 80+ countries receive consistent, high-quality products. For industries requiring reliable, durable, and high-performance sealing, DEDE’s Stainless Steel PTFE Oil Seal Series provides the solution. With a focus on quality, customization, and support, DEDE continues to be a trusted partner for pumps, motors, gearboxes, and more.

Minimum Order: 500

WQ Automatic coupled submersible sewage pump The automatic coupling installation system is mainly composed of fast interface, drainage base, guide rail, guide positioning bracket and so on. During installation, the pump body and the fast interface are closely connected by bolts. The drainage base is first fixed in the pool by anchor bolts. The fast interface drives the pump to slide down along the guide rail, and the drainage base is automatically coupled together through the automatic-coupling sealing surface. After installation, the pump body and motor parts, relying on the pump body outlet flange with the inlet flange connection, the export outlet of submersible sewage pump and the coupling base of connection between the rubber sealing ring seal, submersible sewage pump coupling system by hanging in the air, and using its own weight to seal pressure, ensure reliable sealing between the pipelines. WQ automatic coupled submersible sewage pump has the impeller of single flow channel or double flow channel to handle the fluids with solid particle or fiber etc. impurity. The pump has the advantages of non-blocking, automatic installation, automatic control etc. Submersible sewage pump application: 1 - Municipal works and construction sites 2 - Sewage discharge in residential areas 3 - Sewage discharge from hospitals and hotels 4 - Urban sewage treatment plant drainage system 5 - Drainage station of civil air defense system, water supply device of waterworks 6 - Discharge of seriously polluted sewage from factories and businesses

Minimum Order: 1 bags

In the world of rotating machinery, where shaft sealing is critical to prevent lubricant leakage and external contamination, the EG End Cover Oil Seal Series offers a reliable solution trusted across various industries. Manufactured under the DEDE brand, these oil seals are engineered for durability, adaptability, and long-term performance in high-demand environments.

Minimum Order: 100

CZ stainless steel chemical process pump Conveying low or high temperature liquid; Neutral or corrosive liquid; Liquids that are clean or contain solid particles. Suitable for: Chemical and petrochemical industries Features The pressure acting on the shaft seal is balanced by a balance hole on the blade or impeller. The shaft seal can be made of soft filling seal (can be cooled or not cooled), and can also be made of single and double face non-balance mechanical seal of various structures. Ball bearings are durable and axle diameter is sufficient to ensure smooth operation. Some specifications of the pump body are designed as dual voluting housing to balance the radial force. The bearing frame, including the shaft, impeller, stuffing box and so on, forms a combined component, so that the pump body does not have to be removed from the pipeline during maintenance (if the extended coupling is used, the motor does not have to be removed). Flange design, using PN16, PN25 two kinds (depending on the material difference). In the operation process of chemical centrifugal pump, the mechanical seal will generate heat because of friction, and the heat must be taken away in time to ensure the normal operation of the mechanical seal. According to the working conditions, the following methods can be used. 1 - Self-flushing: the chemical centrifugal pumping medium is used for washing, and the circulation can be internal circulation or external circulation. The internal circulation refers to the chemical centrifugal pumping medium from the outlet of the impeller through the inner hole of the chemical centrifugal pump cover to the sealing surface and then into the chemical centrifugal pump body along the shaft of the chemical centrifugal pump. The external circulation refers to the delivery medium from the chemical centrifugal pump outlet by the pipeline to the sealing gland into the sealing cavity, the external circulation can add heat exchanger, suspension separator and other auxiliary equipment, the external circulation needs to add orifice plate. Application conditions: chemical centrifugal pumping medium should be clean liquid with low viscosity, and should have good lubricity. The internal circulation medium is no more than or equal to 100℃, the external circulation medium temperature is more than or equal to 100℃ to add heat exchanger and other auxiliary facilities. 2 - Wash: the seal is immersed in the chemical centrifugal pumping medium during operation, without the circulation of washing liquid. If the temperature of the chemical centrifugal pumping medium is high, the cooling jacket needs to be added; if the freezing point of the chemical centrifugal pumping medium is high, the insulation jacket needs to be added. Applicable conditions: chemical centrifugal pumping medium should be clean liquid. The temperature of the medium should be less than or equal to 30℃, and the vaporization of the medium must be prevented. When the temperature of the medium is greater than or equal to 100℃, the cooling jacket should be added. When the viscosity of the pumping medium is high and the freezing point is high, the sealing surface should be prevented from having condensation, and the insulation and sleeve should be added. 3 - External liquid supply source flushing: use the liquid from external liquid supply source to fill the sealing cavity. The external supply liquid must have a suitable pressure, temperature must be less than the temperature of the chemical centrifugal pumping medium is not less than 5℃, and a suitable sealed flushing liquid source must be selected to exclude the potential probability of the injected flushing liquid vaporization, and prevent the chemical centrifugal pumping medium from being contaminated by the injected flushing liquid. When necessary, install a turning-meter, flow indicator, flow controller, etc. Applicable conditions: can be used for conveying sewage, chemical centrifugal pump with a few solid particles of the solution (solid material composition ≤5%), and can be used for medium lubrication is weak occasions. Conveying medium temperature ≤100℃. The use of this washing method will make the chemical centrifugal pumping medium mixed with the washing liquid, so the medium has high requirements. It cannot use this method.

Minimum Order: 1 bags

Introducing our top-of-the-line Industrial Applications Skeleton Oil Seal Custom Rubber Coated TG4 Oil Seals with Metal Reinforcement! Our oil seals are designed to provide superior performance and durability in industrial applications. Whether you are in the automotive, aerospace, or manufacturing industry, our oil seals are the perfect solution for your sealing needs. Our oil seals are custom-designed to meet the specific requirements of your application. We offer a wide range of sizes and materials to ensure that you get the perfect fit for your equipment. Our custom rubber coating provides a tight seal that prevents leaks and contamination, while the metal reinforcement adds extra strength and stability. At our company, we take pride in delivering high-quality products that exceed our customers' expectations. Our oil seals are manufactured to the highest standards using state-of-the-art technology and premium materials. We are committed to providing reliable and long-lasting solutions for our customers' sealing needs. In addition to our exceptional product quality, we also offer excellent customer service. Our team of experts is dedicated to providing you with the support and assistance you need to find the right oil seal for your application. We are here to answer your questions, provide technical advice, and ensure that you have a seamless experience with our products. Don't settle for inferior oil seals that compromise the performance and reliability of your equipment. Choose our Industrial Applications Skeleton Oil Seal Custom Rubber Coated TG4 Oil Seals with Metal Reinforcement for unmatched quality and performance. Contact us today to learn more about our products and how we can help you find the perfect sealing solution for your industrial application.

Minimum Order: 500

In the realm of mechanical sealing, consistency and durability are key—not just for performance, but for the long-term integrity of entire systems. The TC skeleton oil seal series has become a go-to solution for professionals seeking reliable sealing in rotating shaft applications, particularly where dual-lip designs and compact structure are essential. This series features a dual-lip configuration, with the primary lip preventing lubricant leakage and the secondary lip offering effective protection against dust, dirt, and other external contaminants. Reinforced with an internal metal skeleton, the TC oil seal delivers a stable fit and sustained sealing pressure, even under demanding operating conditions. Application-Specific Engineering Designed to operate in environments with continuous rotation, moderate pressure, and fluctuating temperatures, the TC oil seal series is widely applied in: Motors and pumps Industrial gearboxes and speed reducers Combustion engines (light-duty and industrial) Hydraulic systems Construction equipment Agricultural machinery Wind turbines and power transmission units Automotive transmissions and heavy trucks Mechanical arms and automation systems These applications demand not only resistance to oil, grease, and environmental factors, but also long-term dimensional stability under radial load. The materials used—typically NBR, FKM, or ACM elastomers—are selected based on temperature range, chemical compatibility, and rotational speed. Built on Manufacturing Excellence NQKSF is a dedicated manufacturing facility specializing in precision sealing technology. With over 30 years of industry experience, our team provides more than just product delivery—we offer full-spectrum support to meet evolving industrial challenges. What sets us apart:

Minimum Order: 500

P New Non-clogging Sewage self-priming pump with open impeller P type non-clogging self-priming sewage pump is suitable for municipal sewage and industrial wastewater treatment engineering, as well as all kinds of wastewater classification treatment and centralized treatment system. It is the king of self-priming sewage pump as the most ideal of the new generation of sewage pump Application: Used to handle non-flammable, explosive liquids Rainwater and general sewage Municipal sewage engineering, construction site, civil air defense system drainage station Light industry, paper making, textile, food, chemical, electrical, mining and other industrial wastewater Sewage discharges in residential areas Sewage and sediment from water purification systems Leather industry, slaughterhouse sewage, pond aquaculture Brewing and sugar Discharge of sewage that is not highly corrosive but has been seriously polluted. Open impeller, no clogging Self-priming performance, Self Priming Sewage Pump with inspection Cover/Maintenance Hole

Minimum Order: 1 bags

Coolant pump for small CNC machine tool / Vertical Submersible multistage centrifugal pump QDYB series are multi-stage centrifugal pumps equipped with standard motors. Motor shaft and pump shaft are integrated and directly connected. The pump can be equipped with intelligent protector as required to effectively protect the pump from dry rotation, phase loss and overloading etc. The filter hollow ring around the inlet section of the base can filter large sundries. The outlet section of cast iron is processed with black electrophoretic paint. The pump is suitable for low viscosity, neutral, non-explosive liquids which does not contain solid material or fiber. the conveyed liquid should not be chemically corrosive to the pump material. Temperature: -15 degree Celsius to 104 degree Celsius Flow range: 1-7m3/h Pressure: 3.6bar Medium PH value: PH5-9 Motor: Fully closed/air cooled motor /2poles/2900rpm/extended shaft aluminum housing motor, /IP55/F/3*380/220V/50HZ The immersible depth of the pump can be customized according to the liquid depth of the user's water tank. Application: The pump is used for conveying machine coolant, lubricating fluid, condensed water, industrial cleaning equipment and other immersion occasions, such as electric spark, chip removal machine, grinding machine, machining center, cooling device, filtration system and so on

Minimum Order: 1 bags

In modern industrial systems, sealing reliability is a key factor in ensuring operational stability, particularly in environments where pressure, temperature, and chemical resistance intersect. One solution that has gained attention across sectors such as automotive, hydraulic, and petrochemical is the Combination Gasket Seal—a component that integrates metal and elastomer materials to provide multi-functional sealing performance. Rather than relying on single-material gaskets, Bonded Seals are designed to offer both structural support and flexible sealing in a single unit. Typically, these products consist of a metal washer or frame—often carbon steel, stainless steel, or brass—bonded to a layer of rubber material like NBR (nitrile rubber), FKM (fluoroelastomer), or EPDM, depending on the medium and environment. Where Are Combination Gasket Seals Used? These seals are commonly used in: Hydraulic pipe connections, especially in mobile equipment or compact manifolds Automotive fluid systems, including fuel injection components and transmission housing High-pressure gas systems where vibration or surface irregularities may cause conventional seals to fail Oil and gas flange interfaces that require both sealing and mechanical retention Their versatility makes them a suitable choice for sealing static interfaces that must remain leak-free under pressure without relying on external sealing compounds. Key Benefits and Performance Features Dual-sealing capability: The metal component ensures stability and pressure resistance, while the rubber layer provides conformity and adaptability to surface imperfections. Easy installation: Most combination gasket seals are designed for drop-in use, eliminating the need for additional sealants or surface preparation. Material flexibility: Manufacturers can select rubber grades tailored for oil, fuel, water, or aggressive chemicals, offering compatibility across various industries. Temperature tolerance: Depending on the elastomer used, seals can operate in a wide temperature range with minimal performance degradation. Reduced maintenance: A proper combination seal reduces the likelihood of leaks over time, lowering maintenance needs and replacement frequency. Customization and Quality Control Many Chinese and international manufacturers now offer custom-designed combination gaskets for specific pressure ratings, flange sizes, or material requirements. Whether the client needs a specific durometer hardness, thickness, or groove fitment, custom production is often available after prototype validation. During manufacturing, strict quality control procedures—including dimensional inspections, material tests, and compression set analysis—are conducted to ensure product consistency and performance integrity.

Minimum Order: 1000

Sulfuric acid transfer pump: Concentrated /thick Sulfuric acid pump Concentrated sulfuric acid pump on the market are mainly fluorine plastic pump (F46) and cast iron pump, cast iron pump advantage is cheap, suitable for conveying high concentration of concentrated sulfuric acid; But if the occurrence of dilute sulfuric acid (sulfuric acid concentration decreased), cast iron is not resistant to dilute sulfuric acid corrosion will appear damage. The advantage of fluorine plastic pump is suitable for conveying arbitrary concentration of sulfuric acid, a wider range of application; The disadvantage is that the price cost is higher than cast iron pump. Dilute sulphuric acid pump At present, the main engineering plastic horizontal pump and steel lining plastic horizontal pump are widely used in China. Ultra high molecular weight polyethylene (UHMWPE) is used to make the flow parts of engineering plastic pump and steel plastic lining pump, which has excellent corrosion resistance, abrasion resistance and impact resistance. Dilute sulfuric acid pump is usually horizontal, single stage, single suction, bracket type centrifugal pump, suitable for the temperature of -20 to 100 degree celsius. The seal of the pump adopts mechanical seal, dynamic seal and packing seal and other sealing forms, which can not only transport dilute sulphuric acid clear liquid, but also transport slurry containing solid particles and wastewater containing various impurities.

Minimum Order: 1 bags

Double entry twin screw pump Double-entry twin screw pump is composed of a power rotor and an idler rotor, whose inter-meshing helix will work with pump casing or housing to form constant-volume sealing chamber. With the rotating of the rotors, medium will enter the casing before being pumped to the pump outlet. Thus the medium delivery is achieved. This pump is with compact structure, stable flow rate without pulsation, reliable operation, available for high speed, low noise, small vibration, high efficiency, long service life, strong self-priming ability and son on, and the twin screw pump can be widely applied in metallurgy, petroleum, chemical, power, transportation, building materials, marine etc. Application Petroleum industry Oil-gas mixture transfer, high viscosity crude oil, polymer, various product oils, etc. Petrochemical industry Lubrication oil, crude oil, heavy oil /HFO, residual oil, asphalt, fuel oil, light dydrocarbon, butadiene, gasoline, kerosene, phenol, etc. Chemical industry Acid, alkali, salt solution, resin, glycerol, paraffin, rubber solution, high polymer, cosmetics emulsion medium etc. Food industry Honey, syrup, animal oil, vegetable oil, etc. Storage and transfer industry Wharf product oil transfer pump, oil ship pump, departing pump, uploading pump, backflow pump, oil reservoir unloading and transfer pump etc. Shipbuilding industry Delivery pump of refined oil, fuel oil, refined asphalt, waste oil, sump oil, etc. cargo oil pump, booster pump, stripping pump, pipeline blow pump etc. Energy industry Heavy oil, fuel oil transportation, lubrication oil, coal water slurry, coal tar, residual oil etc.

Minimum Order: 1 bags

In the automotive industry, where mechanical systems must operate under pressure, friction, and fluctuating temperatures, the reliability of oil seals is vital. Chinese seal factories have become trusted partners in supplying durable automotive oil seals to manufacturers and aftermarket clients across the globe. Rather than focusing solely on price competitiveness, many Chinese seal producers have shifted their attention to material integrity, product design, and long-term sealing performance. Oil seals manufactured for automotive use are designed to maintain lubrication inside critical engine components such as crankshafts, camshafts, and gearboxes, while simultaneously preventing the ingress of dust, water, and contaminants. Key materials often include nitrile rubber (NBR) for standard temperature applications, fluoroelastomer (FKM) for high-heat environments, and silicone for specialized functions. These materials are typically reinforced with stainless steel or carbon-steel frameworks, and in some cases, spring-loaded sealing lips are integrated to ensure consistent radial force. Chinese factories also employ advanced molding technology and precision machining for custom fitment. Whether the application involves passenger cars, trucks, or heavy-duty engines, seal manufacturers provide tailored solutions to meet specific engine configurations and performance expectations. Additionally, international clients benefit from flexible production volumes, responsive technical support, and adherence to international standards such as ISO/TS 16949. With increasing attention to quality and lifecycle value, China’s seal factories are positioning themselves as reliable suppliers in a globally competitive auto parts sector.

Minimum Order: 100

In the global automotive supply chain, the demand for high-quality engine oil seals continues to rise. These critical components play a pivotal role in maintaining the efficiency and cleanliness of internal combustion engines by preventing oil leakage and contamination. As the auto industry grows increasingly cost-sensitive yet performance-focused, many international buyers have turned to Chinese oil seal manufacturers for consistent and adaptable supply solutions. Among these suppliers, manufacturers with a focus on precision engineering and material integrity have proven capable of meeting the evolving needs of both OEMs and aftermarket distributors. Understanding the Function of Engine Oil Seals An engine oil seal, typically located around the crankshaft or camshaft, must handle high temperatures, continuous motion, and varying pressure levels. It is not only expected to retain lubricants inside the engine but also to block out contaminants such as dust, moisture, and road debris. To achieve this, materials such as nitrile rubber (NBR), fluoroelastomer (FKM), or silicone rubber are used—each selected based on the performance environment of the vehicle. The inner structure may also include metal reinforcement and spring-loaded lips to enhance sealing force and durability over time. What Chinese Manufacturers Offer Chinese oil seal factories have advanced significantly over the past decade, moving from standard replication to custom design, rapid prototyping, and material innovation. For international buyers, this means access to: Wide compatibility: Oil seals compatible with various car brands including Japanese, European, and American models Multiple material options: Selection based on temperature resistance, chemical compatibility, and application type Stable production capacity: Suitable for both mass production and specialized batch requirements Global shipment support: Compliance with export packaging, labeling, and certification norms Some factories also provide technical drawings, sample evaluation, and third- party test reports, especially when working with clients in regulated markets. Automotive Applications Covered Oil seals manufactured in China are used across various engine-related systems, including: Crankshaft front and rear oil seals Camshaft oil seals Valve stem seals Timing cover seals Auxiliary drive and pump system seals Each application may demand different design geometries and material specifications, which manufacturers accommodate using CAD-based mold development and in-house compounding capabilities. Collaboration and Quality Control For many international customers, the primary concern is not cost but consistency and communication. Reputable Chinese manufacturers address this by offering: ISO-certified quality systems Pre-shipment inspection protocols On-site testing for compression set, hardness, and aging resistance Responsive communication in English and other languages This makes it easier for buyers to manage long-distance sourcing while maintaining visibility into their supply chain performance. China oil seal manufacturing sector has become an integral part of the global automotive parts network. By offering customized solutions, material variety, and flexible production capabilities, Chinese manufacturers contribute to the efficient operation of modern engines across continents. For companies seeking reliable sources of automotive engine oil seals, partnering with a professional Chinese supplier may present both technical and logistical advantages—especially when collaboration and precision are prioritized alongside affordability.

Minimum Order: 100

Surface centrifugal pump Surface water pump refers to a pumping device installed on the ground, whose main function is to pump groundwater, river water, lake water, etc. to household, agricultural, and industrial purposes. Compared to submersible water pumps, surface water pumps are simpler to install and more convenient to use. The structure of the surface water pump may also vary depending on the usage situation. Structure of surface water pump The ground water pump mainly consists of a motor, casing, impeller, mechanical seal, coupling, bracket, and other parts. The motor and casing are the main supporting parts of the surface water pump, the impeller is the key part of the pump water, the mechanical seal is very important for the pump water seal, and the coupling plays a transmission role. The bracket is designed to ensure the stability and safety of the ground water pump. Usage of surface water pumps The use of surface water pumps is very simple. Firstly, choose a suitable installation location, preferably a flat and close ground to the water source. Then follow the instructions to install the ground water pump, connect the power supply and inlet/outlet, and finally turn on the power supply. Maintenance of ground water pumps The surface water pump needs regular maintenance during use to ensure its normal operation. Specifically, it includes the following aspects: 1. Regularly check whether the motor and casing of the surface water pump are loose or damaged; 2. Regularly clean the inlet and outlet of the surface water pump to prevent pump holes from being blocked; 3. Regularly replace the mechanical seal to ensure the water seal of the pump; 4. Regularly inspect the impeller and coupling of the surface water pump for any abnormalities; If the ground water pump is not used for a long time, it should be dismantled, cleaned, and stored in a dustproof and moisture-proof manner in a timely manner. Vertical or horizontal structure Close coupled type or shaft coupled type Centrifugal or self- priming etc. Pump material: metal (cast iron, stainless steel, duplex stainless steel etc), plastic (polypropylene/PP, fluoroplastic /F46/FEP/PTFE/PVDF etc.) Pump is widely used in industries to transfer /pump different fluids/liquids

Minimum Order: 1 bags