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| Summary of 12/25/25 10:01 GMT: | >> Show Compact View |
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When you work in the sealing industry long enough, one question keeps coming back from customers, distributors, and even maintenance engineers: “What is the difference between a sealing ring and an oil seal?” At first glance, both are small rubber components, but in practice they serve very different purposes. Understanding this distinction is not just technical trivia—it shapes how wholesalers manage stock, how they advise clients, and how they position themselves in competitive markets. Two Components, Two Roles A sealing ring, often an O‑ring, is the simplest and most widely used sealing element. It is designed to sit in a groove and compress between two surfaces, creating a barrier against fluid or gas leakage. Because of its geometry, it is best suited for static sealing or slow reciprocating motion. An oil seal, sometimes called a rotary shaft seal, is more complex. It usually combines a metal case, an elastomer body, and a spring‑loaded lip. Its job is to hug the rotating shaft, keeping lubricants inside while blocking dust, water, or other contaminants from entering. In other words, sealing rings protect static joints, while oil seals defend rotating shafts. Materials and Performance Sealing Rings (O‑rings and similar types) Common materials: NBR (nitrile rubber), FKM (fluoroelastomer), silicone, polyurethane. Pressure capacity: up to 40 MPa depending on design. Temperature range: –40°C to +250°C depending on compound. Advantages: low cost, easy installation, broad compatibility. Oil Seals (rotary shaft seals) Common materials: NBR, FKM, PTFE for high‑speed or chemically aggressive environments. Pressure range: typically 0.03–0.3 MPa, with advanced designs up to 0.5 MPa. Temperature range: –65°C to +260°C depending on material. Advantages: reliable sealing under rotation, protection against external contamination. Where They Are Used The difference becomes clearer when you look at applications. Sealing rings are found in pumps, hydraulic systems, valves, water treatment units, and household appliances. They are also common in agricultural machinery and chemical equipment where static joints must remain leak‑free. Oil seals dominate in rotating equipment: electric motors, gearboxes, engines, wind turbines, metallurgical machinery, construction equipment, heavy trucks, and passenger cars. They are also critical in robotics and mechanical arms, where shafts rotate at high speed and contamination must be avoided. For distributors, this means that a client in the hydraulic sector will likely ask for O‑rings, while an automotive or wind power customer will demand oil seals. FAQ Q1: How should I plan inventory? O‑rings come in thousands of sizes, but demand is concentrated in a few standard dimensions. Oil seals, on the other hand, must cover common shaft diameters. A balanced stock strategy is to keep fast‑moving O‑rings in bulk while maintaining a representative range of oil seals for motors and gearboxes. Q2: What if a customer needs non‑standard parts? Special conditions are common. A metallurgical plant may need seals that withstand high temperatures, while a chemical facility may require resistance to aggressive media. In such cases, customization is essential. Q3: How can I add value beyond selling parts? Distributors who only deliver boxes of seals risk being replaced by the next cheapest supplier. Those who can advise on material choice, lip design, or installation practices become trusted partners. In industries such as pumps, motors, gearboxes, engines, industrial machinery, robotics, energy, construction equipment, wind power, metallurgy, chemical processing, hydraulics, agriculture, water treatment, rail transport, aviation, and heavy vehicles, downtime is expensive. A failed seal can stop a production line, ground an aircraft, or immobilize a truck fleet. That is why distributors and wholesalers who understand the nuances between sealing rings and oil seals are better positioned to serve these sectors. The difference between sealing rings and oil seals is not just a matter of geometry. It is about understanding where each belongs, how materials and pressures affect performance, and how distributors can align their stock and services with customer needs.
Minimum Order: 1000
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Shanghai China
Shanghai
China
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When distributors, wholesalers, or OEM buyers step into the sealing industry, one of the first questions they encounter is: “What’s the real difference between an O-ring and an oil seal?” At first glance, both belong to the same family of sealing products. Yet in practice, their designs, functions, and applications diverge in ways that are crucial for equipment reliability and supply chain planning. Let’s break down the distinctions in a way that matters most to the B2B audience—those responsible for stocking, sourcing, and ensuring machinery uptime. Core Function and Design O-Rings are perhaps the simplest yet most universal sealing components. Usually circular with a round cross-section, they form a barrier between two surfaces by being compressed in a groove. Their advantage lies in versatility—they can seal fluids or gases, work in static or dynamic settings, and adapt to pumps, valves, hydraulic cylinders, and even consumer appliances. Oil Seals (Rotary Shaft Seals), on the other hand, are engineered specifically for rotating shafts. They often feature a metal case and elastomer lip that maintains lubrication inside while blocking dust, dirt, or moisture outside. Found in engines, transmissions, gearboxes, and heavy-duty motors, oil seals deal with friction, pressure, and temperature fluctuations far beyond what an O-ring typically faces. Bottom line: O-rings handle general sealing across multiple interfaces, while oil seals protect rotating systems where lubrication and exclusion are equally important. Materials and Performance Both O-rings and oil seals can be manufactured from a wide range of elastomers and polymers. Material choice determines durability, resistance, and cost. Nitrile Rubber (NBR) – Reliable for mineral oils and standard hydraulic applications. It’s the default option for many distributors because of steady demand and favorable pricing. Fluoroelastomer (FKM) – Withstand higher heat and aggressive chemicals. A must-have for automotive, energy, and chemical industries. Hydrogenated Nitrile Rubber (HNBR) – Stronger mechanical resistance and better weathering than NBR, making it ideal for heavy equipment and high-pressure hydraulics. PTFE (Polytetrafluoroethylene) – Often the last resort for extreme speed, chemical exposure, or temperature ranges from -65°C to +260°C. Commonly ordered for projects, less for bulk stock. In practice, O-rings typically rely on compression set resistance, while oil seals require structural stability (lip geometry, garter springs, dust lips) to perform under dynamic load. Application Insights for Buyers For distributors and wholesalers, understanding the application gap is essential to building a profitable inventory: O-Rings dominate in pumps, valves, fluid connectors, robotics joints, and industrial automation. They are purchased in bulk, cover thousands of sizes, and are often stocked as standard items. Oil Seals are critical in rotating shafts of engines, gearboxes, and transmissions. Their sales are less about sheer volume and more about correct specification—shaft size, speed, medium, and temperature. From a stocking perspective, O-rings are the fast movers, while oil seals bring value-added margins through technical specification and project supply. FAQ Q1: Which products should form my core inventory? O-rings: large-scale, general-purpose, fast-moving goods. Oil seals: focus on common sizes for engines and gearboxes, while rare types can be supplied on demand. Q2: How can I reduce warranty claims from my customers? Material selection is critical. Supplying NBR seals into high-temperature systems is a shortcut to failure. Instead, stocking FKM or HNBR options improves reliability and reduces aftersales costs. Q3: Can suppliers really handle urgent orders? Yes—if they maintain extensive stock and a flexible production setup. For distributors, working with a manufacturer that combines standard inventory and customization is the best way to meet unpredictable market needs. 5. How NQKSF Supports Its Partners In this competitive landscape, the choice of supplier makes as much difference as the choice of material. NQKSF has positioned itself as more than just a component producer—it’s a full-service sealing partner with decades of experience. Standard Stock Delivery – Covering more than 10,000 specifications of O-rings and oil seals, ensuring rapid supply for urgent requests. Customized Service – From material selection to structural design and validation testing, NQKSF develops non-standard seals precisely matched to operating conditions. Technical Empowerment – With 30+ years in the sealing industry, NQKSF helps optimize performance, extend service life, and lower maintenance costs for industrial equipment. 6. Industry Recognition Beyond manufacturing, NQKSF is recognized as a: Physical manufacturing base with global reach Industry leader in sealing technology Supplier with complete models and full stock availability Exporter to more than 80 countries worldwide Trusted partner of global brands Provincial innovation center and high-tech enterprise Designated “specialized and innovative” enterprise, leading in industrial clusters These credentials ensure stability, compliance, and confidence for distributors and wholesalers who rely on consistent quality. While O-rings and oil seals may look like small components, they play dramatically different roles in machinery. O-rings deliver flexibility and universality, while oil seals secure rotating shafts under challenging conditions. For distributors, wholesalers, and OEM buyers, recognizing this difference is not academic—it directly impacts inventory efficiency, customer satisfaction, and long-term profitability. With its combination of stock readiness, customization capability, and technical expertise, NQKSF continues to support global partners in industries ranging from pumps, gearboxes, and industrial robots to automobiles, heavy trucks, and energy systems.
Minimum Order: 1000
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18713908608
Hetou Industrial Zone, Renze District, Xingtai City, Hebei Province
Xingtai City, Hebei
China
Oxidized polyethylene wax primarily functions as a dispersant in masterbatch production. By enhancing the uniform distribution of pigment particles within the carrier resin, it improves the gloss, processability, and dispersion stability of the final product. Enhancing Dispersion Uniformity： Oxidized polyethylene wax reduces van der Waals forces and electrostatic attraction between pigment particles, disrupting agglomerate structures to facilitate dispersion in the molten state. For instance, inorganic pigments like carbon black, which tend to aggregate due to high surface energy, achieve nano-level uniform distribution when oxidized polyethylene wax is added. Improved Processing Performance： Wax dispersants enhance melt flowability, reduce viscosity, decrease extruder energy consumption, and boost production efficiency. Simultaneously, their lubricating effect prevents heat buildup from friction between pigment particles during processing, avoiding equipment overheating or malfunctions. Improved Product Performance： Uniformly dispersed pigment particles reduce surface defects like color spots and streaks while enhancing gloss and mechanical properties. For applications demanding high dispersion quality—such as automotive components and appliance housings—polyethylene oxide wax prevents stress concentration issues caused by agglomeration.
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+8613821321522
Hesheng International Plaza, Binhai New Area, Tianjin
Tianjin 300450
China
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Tiansheng is a professional and well-known auto parts manufacturer in China. Tiansheng's auto parts are directly supplied to OEMs such as BMW Brilliance, Volvo, SAIC Volkswagen, and SAIC GM. If you need to outsource electrophoresis business, please contact us. Tiansheng is a professional and well-known auto parts manufacturer in China. Tiansheng's auto parts are directly supplied to OEMs such as BMW Brilliance, Volvo, SAIC Volkswagen, and SAIC General Motors. If you are looking for an auto parts supplier, please contact Tiansheng (email: caoyuyan@autolpj.com). Phosphate electrophoresis line description: Phosphate electrophoresis line, built in 2008. The electrophoresis process has obtained a national invention patent (patent number: ZL201310004879.2, patent name: A method for surface treatment of automotive cover parts). The product quality is highly reliable, and the chemical supplier is BASF. The designed production capacity is 1.8 million pieces/year, and the current remaining capacity is 1 million pieces. If you need to outsource electrophoresis business, please contact us. Electrophoresis process: phosphating. Production line completion time: 2007. Environmental impact assessment and other procedures: complete and sound. Production line speed: 2.5 meters/minute. Maximum passing size (unit: mm): L3700×W800×H1600.
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No. 288, Beiyuan Road, Dianshanhu Town, Kunshan City, Jiangsu Province
Kunshan
China
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Tiansheng undertakes the PVC coating business for auto parts. Tiansheng is a professional and well-known auto parts manufacturer in China. Its products are directly supplied to OEMs such as BMW Brilliance, Volvo, SAIC Volkswagen, and SAIC GM. If you are looking for an auto parts supplier, please contact us. Tiansheng Company has complete and comprehensive processes, including: stamping, welding, PVC, painting, and packaging. It is a professional and well-known auto parts manufacturer in China. If you are looking for an auto parts supplier, please contact Tiansheng Company (email: caoyuyan@autolpj.com).
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No. 288, Beiyuan Road, Dianshanhu Town, Kunshan City, Jiangsu Province
Kunshan
China
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Tiansheng Company produces all kinds of stamping inner plates, outer plates, and stamping sub-parts. If you have the need to outsource the production of stamping parts, please contact us immediately. Our production equipment: mechanical press line, hydraulic press line Main experimental facilities: three-coordinate/blue light/gauge. Tiansheng is a professional and well-known auto parts manufacturer in China. Tiansheng's auto parts are directly supplied to OEMs such as BMW Brilliance, Volvo, SAIC Volkswagen, and SAIC GM. If you are looking for an auto parts supplier, please contact Tiansheng (email: caoyuyan@autolpj.com). The stamping line can produce a variety of small batches of products, and can also produce mass-produced parts. There are 5 stamping lines in total, namely: Line A, Line B, Line C, Line D, and Line E. The stamping production line has high precision and can be switched automatically/manually. The total production capacity of the 5 stamping lines is 2.1 million pieces, and the remaining production capacity is 1.8 million pieces.
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No. 288, Beiyuan Road, Dianshanhu Town, Kunshan City, Jiangsu Province
Kunshan
China
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Carbon steel forged flanges are widely used in various industries due to their strength, durability, and ability to withstand high-pressure and temperature conditions. These flanges are manufactured through the forging process, ensuring high structural integrity and resistance to wear and tear. 1. Types: Slip-On, Welding Neck, Blind, Socket Welding, Threaded, Lap Joint and Plate flanges, etc. 2.Wall Thickness: Sch10, Sch20 , Sch30, STD, Sch40, XS,Sch80, Sch100, Sch120, Sch140, XXS; 3.Pressure Rating: Class 150LBS, 300LBS, 600LBS, 900LBS, 1500LBS, 2000LBS, 3000LBS, 6000LBS, 9000 LBS; 4. Surface treatment: Anti-rust oil, black / yellow / transparent / electric galvanized / hot galvanized. 5. We stock ASME B16.5 Flanges; find the right dimensions and style for any application. Forged steel flange has higher precision and performance than the cast flange and is widely used in different industries for connecting equipment or pipelines, especially for high temperature and high pressure environments. Forged flange is a plate-type device, usually in circular appearance, which can be attached to the ends of pipes, fittings, valves, or other objects to facilitate assembly and disassembly of the piping system. It offers impressive mechanical performance as a connecting part. Manufacturing Standards Referred ASME B16.5: Dimension standard for steel pipe flanges and flanged fittings ASME B16.47: Large diameter steel flanges NPS 26 to NPS 60 MSS-SP44: For steel pipeline flanges API 605: For large diameter carbon steel flanges Application Fields Industry Example Applications Oil and Gas Pipelines, refineries, offshore platforms Petrochemical Chemical processing plants, storage tanks Power Generation Power plants, nuclear facilities Water Treatment Water and wastewater treatment plants Automotive Engine components, exhaust systems Construction Structural applications, HVAC systems
Minimum Order: 100
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18003119682
Wuliyao Industry Zone, Yanshan County,
Cangzhou 061300
China
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A Spectacle Blind Flange(also called Figure 8 flange) is a pressure-retaining plate with one solid end and one open end connected with a web or tie bar. Size: 1/2″ to 96″ Pressure class: Class 150 to Class 2,500, PN 2.5 to PN 250 Facing: RF / RTJ Spectacle flanges, also known as spectacle blind flanges or Figure 8 flanges, are most commonly used on piping systems that need to be separated regularly or where the flow through the systems is regularly stopped. One end of the spectacle flange is solid, while the other end has a hole in the center. The spectacle flange can be rotated to place either the solid or hollow end within the pipe system, thereby opening or closing the flow. Spectacle blind flanges types: There are three types of spectacle blinds: 1. Flat face spectacle blind (FF) flange Similar to a flat face flange, the surface of the disc is flat (suited for flat face gaskets, for low-pressure applications). 2. Raised face spectacle blind (RF) flange likewise raised face flanges, there is an additional thickness on the surface of the disc. This type fits semi-metallic gaskets, as the spiral wound type. 3. Ring joint face spectacle blind (RTJ) flange a groove is inscribed on the surface of the disc. This type is used in conjunction with ring joint gaskets. Functions: Blind flange VS. spectacle blind flange The function of the blind flange is the same as that of the head and the pipe cap, except that the seal of the blind plate is a detachable sealing device, and the seal of the head is not ready to be opened again. There are many types of sealing surfaces, including plane, convex, concave, convex, mortise and groove surfaces, and ring connection surfaces. Materials are carbon steel, stainless steel, alloy steel, copper, aluminum, PVC, and PPR. The spectacle blind plate is commonly used for the pipeline flange, which needs to change the process. The material mainly includes carbon steel, stainless steel, and alloy. It can be selected according to the pipeline pressure grade and pipeline medium.
Minimum Order: 10 long tons
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18003119682
Wuliyao Industry Zone, Yanshan County,
Cangzhou 061300
China
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When global distributors or OEM partners evaluate industrial sealing solutions, one recurring question arises: Which sealing materials are most reliable for oil seals, and how should they be matched to different operating conditions? The answer is not universal—it depends on how the equipment runs, what kind of fluids are involved, and the business priorities behind procurement. Material Options in Practice In industrial supply chains, not every buyer needs the most advanced material. Instead, they need the right balance between performance, cost, and availability. Over the years, the following groups of materials have consistently proven practical: Nitrile Rubber (NBR) – Often the workhorse of the sealing world. It handles mineral oils, moderate temperatures, and routine hydraulic applications. For distributors, NBR is attractive because it moves fast in the market, reduces stock risks, and covers most everyday requests. Fluoroelastomer (FKM) – For high heat or aggressive chemicals, FKM remains a preferred choice. Gearboxes in heavy trucks, chemical pumps, and energy sector equipment rely on it. While unit prices are higher, end-users recognize its long-term savings by avoiding frequent replacements. Hydrogenated Nitrile Rubber (HNBR) – A material positioned between NBR and FKM. It brings mechanical strength and aging resistance, which is why construction machinery and wind power gear systems often specify it. For wholesalers, it serves clients who want “better than NBR but not as costly as FKM.” Polytetrafluoroethylene (PTFE) – The problem solver when nothing else works. High-speed shafts, marine engines, aerospace systems, or metallurgical lines require PTFE because of its chemical resistance and ability to tolerate -60°C to +250°C. These seals are usually ordered for projects, not kept as bulk stock. Silicone Rubber (VMQ) – Found more often in appliances and low-temperature applications. While not a dominant choice in heavy industry, it fills important gaps in the distributor’s catalog. FAQ Q1: Which materials should I always keep in stock? A: NBR is non-negotiable. HNBR and FKM should be stocked depending on the customer base. PTFE and VMQ can be handled through project-based supply. Q2: How do regional markets differ? A: European and North American buyers often demand FKM and PTFE due to strict compliance and performance standards. Asian markets value cost efficiency, making NBR and HNBR more popular. Q3: What about equipment trends? A: With renewable energy and automated machinery growing, HNBR demand has risen. PTFE also gains traction in specialized chemical and energy sectors. The Role of the Supplier A reliable supplier is as critical as material selection. DEDE has built its reputation by combining technical capability with supply chain responsiveness: Fast delivery of standard items – with an inventory covering more than 10,000 sizes of O-rings and oil seals, urgent requirements are handled quickly. Customized sealing solutions – guiding partners through material selection, structural design, and validation testing to ensure seals fit unique operating conditions. Technical support – over 30 years of experience allows DEDE to advise on how to reduce maintenance costs and extend the service life of machinery. From its manufacturing base, the company supplies to more than 80 countries, works with globally recognized brands, and has been designated as a provincial innovation center, high-tech enterprise, and a specialized industrial cluster leader. For distributors, this means confidence in both quality and continuity of supply. Choosing the right oil seal material is not a matter of “better or worse,” but of fit for purpose. For distributors and wholesalers, aligning inventory with customer demand while partnering with a supplier who can provide both ready stock and technical customization is the most sustainable strategy. With its combination of material expertise, manufacturing strength, and international reach, DEDE continues to support its partners in building competitive advantages across diverse industries.
Minimum Order: 1000
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Shanghai China
Shanghai
China
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Bluetooth Audio Glasses 215
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Room 801B, Building C, Shenye Century Center, Zhoushi Road, Hangcheng Street, Baoan District
Shenzhen
China
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Bluetooth Audio Glasses 211B
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Room 801B, Building C, Shenye Century Center, Zhoushi Road, Hangcheng Street, Baoan District
Shenzhen
China
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Bluetooth Audio Glasses 208P
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Room 801B, Building C, Shenye Century Center, Zhoushi Road, Hangcheng Street, Baoan District
Shenzhen
China
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Bluetooth Audio Glasses 207A
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Room 801B, Building C, Shenye Century Center, Zhoushi Road, Hangcheng Street, Baoan District
Shenzhen
China
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Bluetooth Audio Glasses 201C
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Room 801B, Building C, Shenye Century Center, Zhoushi Road, Hangcheng Street, Baoan District
Shenzhen
China
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A1 7-inch 1280×600pixels IPS display Support carplay/Android Auto Support airplay/Miracast projection 2.4G+5G dual-band wifi+BT5.0 MIC/speaker AUX/FM transmitter/Bluetooth link to original car audio Reversing visual camera support
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Room 801B, Building C, Shenye Century Center, Zhoushi Road, Hangcheng Street, Baoan District
Shenzhen
China
SOURCE: Import-Export Bulletin Board (https://www.imexbb.com/)
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