NAK Oil Seals are often referred to as radial shaft seals, rotary shaft seals, or rotary shaft lip seals and so on. The main function of the oil seal is to protect the system from dirt, dust, water and other contaminants, retain the lubricant in system. Many NAK Oil Seals contain a garter spring that adds strength to the seal and provides additional support against the radial forces, which in turn improves the life of the seals.
NAK offers dynamic seals including
NAK Oil Seals
, radial shaft seals, rotary seals, electric motor seals, shock absorber seals, engine seals, power steering seals, hub seals, transmission seals, axle seals, V ring seals, gearbox seals, high pressure seals, and washing machine seals.NAK Oil Seals
NAK Sealing Technologies Corporation
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Oil Seals
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Radial shaft seals are used for retain the lubricant in the system and prevents fluids from leaking into or out of the system. It also prevents contaminants such as water, chemicals, dust etc. from getting in. This helps in proper functioning of the system and also extends the service life of the system.
The Radial shaft seal is mainly comprised of rubber, metal case and a garter spring. This combination of materials along with a robust design makes a strong seal. The radial force of the main rubber lip keeps it in contact with the shaft, forming a layer of oil film between the oil side and air side of the shaft, while still maintaining a tight seal to keep the environments separated and prevent leakages.
Radial shaft seals are critical for proper functioning of a mechanism. Without the radial shaft seal, the system would be devoid of lubricant which will result in metal to metal contact under high friction and increase the wear rate of the components which in turn would lead to premature failure of the system.
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Rotary Shaft Seals
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Rotary Seals are often referred to as radial shaft seals, rotary shaft lip seals, or oil seals and so on. The main function of the rotary seal is to protect the system from dirt, dust, water and other contaminants, retain the lubricant in system. NAK’s research and development team has more than 45 years of experience in design and manufacture of seals. NAK uses cutting edge technology to support OE customers.
NAK sources its raw materials from world leaders in the field from around the world, including America, Japan and European countries. These high grade materials helps in making seals with very specific and important properties such as wear resistance, oil & fluid resistance and chemical resistance which are key to the functioning and life of the seal. The most common rubber materials are NBR, HNBR, FKM, ACM, VMQ etc. NAKs R&D and in house materials laboratory team have successfully created customized rubber compounds for very specific customer requirements through our StreamSyn Sealing Solutions.
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Electric Motor Seals
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NAK has always been a front runner in the industry to develop seals for futuristic technologies. This has helped us to design and develop seals for the E-World. NAK clearly understands the sealing needs of e-Mobility motors. Electric motor seals in an electric motor are an essential component to keep the system dry and allow oil lubrication of the gearbox. An electric motor seal must be designed to withstand the dry conditions in an electric motor while still being able to accommodate the necessary of oil lubrication for a gearbox that can run at speeds up to or over 10,000 rpm.
In e-mobility, these two diametrically opposite conditions in the same application must be kept completely separated by the e-mobility seal. NAK has developed a special lip design that can handle both conditions by providing an excellent sealing function, reducing friction and improving the energy efficiency of the mechanism.
The main lip is designed to maintain a tight seal as well as minimize friction caused by a motor operating at high speeds in drier conditions.
NAK’s electric motor seal is manufactured with an advanced rubber formula (FKM, PTFE) to meet the demands of high speeds and a wide range of temperatures.
NAK Sealing Technologies Corporation
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Shock Absorber Seals
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Shock absorber seals are an essential part of every shock absorber because they seal the lubricant, reduce friction, keep contaminants out, and extend the service life of the shock absorber. The purpose of a shock absorber is to help keep the vehicle steady in rough driving conditions and provide good comfort to the driver and passengers. NAK has developed advanced rubber formulas and designed special seals for shock absorbers used in motorcycles, automobiles, light trucks, heavy commercial vehicles, and more.
NAKs advanced rubber formulas (NBR, HNBR, FKM) can handle a very wide temperature range (-45 °C ~ +200 °C), while also being compatible with shock absorber oil.
NAK’s seal is designed with a thick and hardened metal case, with an enhanced oil seal structure that can be used in the OEM’s automated assembly lines.
The main lip in NAK’s shock absorber seal design comes with a garter spring that strengthens the sealing effect by providing added radial force. The high quality materials and special design increases the durability of the oil seal.
The special design of the dust lip helps reduce friction, prevents lip eversion, and keeps contaminants from entering the shock absorber.
NAK’s seal design comes with a non-return valve lip that functions as a check valve. It is located on the body of the seal, at the end of the spring-loaded lip.
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Engine Seals
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NAK provides a complete range of engine seals to its customers. This includes all of the essential seals, such as: valve stem seals (including both the traditional type as well as the supercharged type), camshaft and crankshaft seals. NAK’s advanced rubber formulas meet the temperature demands in the mechanism as well as be able to withstand the harsh, highly-corrosive application environment. Each formula has undergone stringent field testing ensuring superior quality and performance.
The structural design of the seals ensures good lubrication in the engine. This ensures perfect lubrication for optimal function. The seals have an important function to improve fuel efficiency by lowering the amount of work the engine must do to compensate for energy loss that can come from faulty or loose seals. The seals also have the ability to preserve the life of the engine, not only by keeping the parts properly lubricated but also by keeping corrosive or polluting agents out. This reduces wear on the parts.
NAK’s customized valve steam seal has a precision design that allows sufficient lubrication on the valve guide and the valve stem, while still preventing oil leakage. This design keeps the engine's operation stable. It also helps extend the service life of the valve.
NAK has two standard designs for a valve stem, a flange design and a non-flange design. The flange design is equipped with a spring to prevent the cylinder head from wearing out.
NAK’s customized helix design for the camshaft seal and for the crankshaft seal is able to provide dynamic sealing.
NAK Sealing Technologies Corporation
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Power Steering Seals
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Seals play a very important role in any power steering system. NAK has a lot of expertise in making power steering seals. NAK offers pinion seals, rack shaft seals, steering pump seals, boots and bellows. NAKs advanced technology helps develop any seals needed for a power steering system. Within a power steering system, the seals have several vital functions.
They reduce friction in a high pressure environment, prevent fluid leakage.
They protect the power steering from contaminants that might enter and damage the steering gears.
The seals also reduce kinetic energy loss which lowers fuel consumption and boosts fuel efficiency.
NAK has developed seals with advanced rubber formulas, and customized designs for a wide range of power steering systems, including class 1 to class 8 hydraulic power steering systems, electro-hydraulic power steering systems and electric power steering systems. NAK also offers seals for power steering gears, electric steering gears, and other types of steering system. Steering seals are essential in maintaining the compression and power of the system.
NAK’s customized main lip design has been proven effective in reducing friction and preventing fluid leakage.
NAK’s back-up ring design gives added support to the back of the main lip. This enhances the seals ability to withstand high pressure of the power cylinder. It also prevents lip eversion.
This seal comes with a dust-lip designed to prevent contaminants from entering the steering gear.
The outer diameter has grooved design to aid in easy seal installation.
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Hub Seals
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A hub seal is applied between the wheel and the end of the axle. This seal is absolutely essential to the hub because it prevents contaminants from entering the system and prevents lubricant from leaking out. NAK seals have been proven effective in extending the service life and protecting the bearing in the hub. NAK has developed advanced rubber formulas and customized designs for all types of light trucks and also for heavy commercial vehicles.
The customized helix design of the main lip improves the pumping rate while maintaining a tight sealing function.
The hub seal is combined with a sleeve to form a multi-lip cassette seal design that is strong in preventing contamination from dust or mud in a harsh environment. This is absolutely vital to the functionality of heavier vehicles, especially in construction, agriculture and earth-moving machines.
NAK Sealing Technologies Corporation
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Transmission Seals
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NAK has a wide range of transmission seals available. NAK offers the main transmission seals such as input shaft seals, output shaft seals, gear lever seals and piston seals. NAK can also provide customized sealing solutions based on customer requirements. The function of transmission seals is to prevent oil leakage, and to protect the transmission from outside contaminants. NAK’s special design reduces the seal’s size. This saves space and lowers installation time. This design can be used in all different types of transmissions, including manual transmissions (MT), automatic transmissions (AT), continuously variable transmissions (CVT) and dual clutch transmissions (DCT).
NAK has also developed a series of transmission piston seal kits for automatic transmissions. NAK’s customized seal design is equipped with a multi-layer dust lip. This prevents outside contaminants from entering the gearbox.
It also has a multi-layer side lip design which provides further protection against outside contaminants entering into the gearbox.
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Axle Seals
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The axle seal is essential to the operation and service life of the axle. Since the axles are under the car, they are subjected to extremely harsh and dirty conditions. The seal must be robust and perform well against harsh contaminants which include gravel and dust from the road. The seal must also be able to retain lubrication and grease and prevent it from leaking out. The ability of the seal to seal the lubricant inside and exclude contaminants from the outside is critical in providing extended life of the bearings and axles.
NAK’s customized design provides a complete axle seal solution, which includes axle seals and wheel bearing seals. NAK’s seals are suitable for all types of vehicles including automobiles, light trucks and so on.
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V Ring Seals
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The V ring seal is made entirely of rubber for ease of installation and to allow for a good press fit on the shaft. Normally they are mounted on the rotating shaft and allow the sealing lip to press against the stationary counter face of the housing bore, bearing washer or other surface, providing for a good tight seal. The flexible lip design allows axial movement and accommodates for radial misalignment. It protects against dirt, dust and water.
This seal can be used in a wide range of motor applications.
The all rubber design gives the seal the flexibility it needs to perform, while also allowing wide machining tolerances on the mating components.
NAK Sealing Technologies Corporation
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Gearbox Seals
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NAK makes seals for industrial reducers or gearboxes, including rotary seals, oil gauge seals and end caps. The purpose of these seals is to prevent lubricant from leaking out, and to keep contaminants such as water and dust from getting in. It comes with a small oil glass so people can monitor the oil levels.
NAK’s dedicated R&D helps NAK be ahead of the curve in terms of technology, rubber, design and development. This helps NAK being ready to meet special industry needs. Our team does extensive research into customer requirements (Voice of Customer) and uses scientific advancements as well as innovation in engineering to provide high performance seals. NAK makes seals for harmonic reducers, cycloid reducers, planetary gear reducers, gear reducers, worm reducers, spiral bevel gear reducers and other sealing solutions.
NAKs seals have the following advantages:
A low-torque seal design greatly improves the operating efficiency of the equipment by 3% - 10%.
NAKs seal slows the rate of temperature increase to improve the seal life.
The oil return groove is designed to improve sealing effect.
An anti-rust design that ensures the normal operation of the oil seal.
A protection lip seal design that protects the main lip of the seal.
NAK has special food grade rubber to meet the seals made with a food-grade rubber formula that keeps people safe.
NAK Sealing Technologies Corporation
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High Pressure Seals
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High pressure seals are essential to a pump’s functioning and service life. High pressure seals must withstand a high internal pressure, while preventing hydraulic oil leakage. The seal must also be able to keep contaminants such as water and dust from entering the system. High quality seals provided by NAK can extend the pump’s service life.
NAK supplies seals for all different kinds of pumps, including piston, gear, vane, vacuum and submersible pumps. NAK can also customize the seals to meet a customer’s exact specifications.
Due to our special structural design, our advanced high pressure seals can withstand pressures of up to 15bar.
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Washing Machine Seals
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The main functions of washing machine seals are to seal the lubricant and to prevent contaminants like water, detergent or bleach from entering the bearing. For this reason, each seal is designed to operate in chemically harsh environments and the rubber is chosen to be compatible with the chemicals it may come in contact with in a washing machine setting. Washing machine seals also prevent grease and lubricant from leaking into the drum tank.
NAK has developed advanced rubber formulas and designed seals for all kinds of washing machines, including top loading machines, front loading machines and steam machines.
Our advanced rubber formulas, such as NBR, HNBR and FKM, have an excellent resistance to detergents and bleach.
Our customized multi-lip design is effective in sealing in the lubrication while also keeping contaminants out.
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End Cap
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End caps are made from metal lid with vulcanized rubber on the outside. End caps are used as perfect end seals for round holes in gearboxes or gear motor housings. It is a static seal and its main function is to prevent fluid from leaking out of the round holes.
We use high quality rubber (NBR and HNBR) which can withstand a wide temperature range.
Our customized design can withstand pressures of up to 5bar.