Several things you need to know about Hub Seals from the Hub ...

As the largest seal supplier in Taiwan, NAK Sealing Technologies Corporation manufactures and exports Hub Seals to customers around the world. The sales volume for all kinds of Hub Seals , including OEM and aftermarket segments, increases steadily each year. The NAK R&D team has decades of combined experience in technology, and understands the unique needs of the automotive application.

If you want to learn more, please visit our website.

Through its innovative technical service, NAK works with its customers closely to find the best

Hub Seals

solutions for stringent applications in automotive, agriculture and construction. As a customer-oriented company, we sincerely look forward to partnering with our customers in a long term relationship.

Hub Seals

Model - Hub Seals

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.

NAK Sealing Technologies Corporation

Hub Seals

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Products List

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Radial Shaft SealsOil 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 SealsRotary Shaft Seals

NAK Sealing Technologies Corporation

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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 SealsElectric Motor Seals

NAK Sealing Technologies Corporation

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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.

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Shock Absorber SealsShock Absorber Seals

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 SealsEngine Seals

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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.

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Power Steering SealsPower Steering Seals

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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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Transmission SealsTransmission Seals

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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 SealsAxle Seals

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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 SealsV Ring Seals

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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.

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Gearbox SealsGearbox Seals

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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.

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High Pressure SealsHigh Pressure Seals

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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 SealsWashing Machine Seals

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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 CapEnd Cap

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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. 

Flipper gasket can be thought of as any seal which incorporates an angled flap which sits against a closing surface to form a seal. Often these will be attached to an integrated rubber frame which pushes into a profile or channel to fit but can also be an adhesive or wedge-fit type of gasket. Flipper Gaskets are typically made from resilient materials like rubber or synthetic elastomers. When measuring flipper gasket it is important to measure both the angled flap and the base or section of the profile as with this example (the angled flap measures 7.1mm and the width of the profile section is 5.1mm):

Structure and Design: Flipper gaskets are designed with flexible fins or projections along their length, typically made of rubber or synthetic elastomers. These fins allow the gasket to compress and retract as needed.

Function: Flipper gaskets serve to provide weatherproofing and ensure smooth operation in sliding or sash windows, sliding glass doors, and similar fixtures.

Sealing and Operation: They create a seal against air and water when the window or door is closed, and they reduce friction between moving parts, allowing for easy opening and closing.

Installation: Flipper gaskets are installed in a groove or channel within the frame or sash, and they maintain a continuous seal even when the surfaces are not perfectly square or level.

 

Bubble Gasket Seal

Bubble gasket describes any gasket where the extruded profile contains a fully surrounded “Bubble” or pocket of air. This bubble is squashed or compressed by two meeting surfaces to form a seal between them. Again, these can be attached to various bases such as extruded profile-specific frames, or flat self-adhesive bases. As with other gaskets, there is a vast array of different shapes and sizes of bubble gaskets, and we are only able to stock a concise range of common types. Please see below for a typical bubble gasket with the required measurements:

Structure and Design: Bubble gaskets are characterized by a row of interconnected, hollow bubbles or bulbs along one side of the gasket. These bubbles are typically made of rubber or synthetic elastomer materials.

Versatile Sealing: Bubble gaskets are highly versatile and can conform to irregular or uneven surfaces. When compressed, the bubbles flatten out to fill gaps and create a seal.

Primary Use: They are commonly used in doors, windows, automotive seals, and electrical enclosures to provide airtight and watertight seals.

Installation: Bubble gaskets are installed in a groove or channel within the frame or sash, ensuring that the bubble side makes contact with the opposing surface when closed.

 

 

Foam Seals

 

Foam Seals are another common type of seal made from extruded compressible foam, in a specific shape designed to suit a specific door profile. These will usually have a reinforced section that slides or pushes into a channel on the door or window which holds it in place.  

Here is a common example of a Q-Lon foam weather seal:

The darker section is the reinforced area which maintains shape and helps to keep the seal in place, whereas the rest of the seal is made from compressible foam. Again, it is important to obtain measurements of both the seal area itself and the re-enforced section which is retained inside the profile. Some foam seals are adhesive-backed so that they can be face fixed to a surface, here is an example:

WOOL PILE DRAUGHT EXCLUDER

Wool Pile draught excluder is a brush-like strip which is used to fill gaps between surfaces where draughts may otherwise get through and insulate the opening helping to retain heat. Due to its brush-like construction, it is ideal for use where the seal may be swept over by a passing surface such as the edge of a door or frame during the door’s operation, as the flexible wool pile brush may not wear down, collapse, or perish as quickly.

Duffells supplies wool pile draught excluder in 2 sizes, either PILE550M which has a base width of 4.8mm and a pile height of 5.5mm or PILE750M which has a base width of 6.9mm and a pile height of 7mm. Both come supplied in 50m lengths. The base of the pile seal usually slides into a channel, which may be part of the construction of the surface or added afterwards.

 

Pile Strip slid into place in a pre-existing channel

 

Other seals

Duffells range of seals also includes some self-adhesive universal-type seals manufactured from an EPDM rubber which has an adhesive backing. These can be used to conveniently seal gaps where no provision has been made for other types of seals to be installed such as on plain or damaged meeting surfaces.

These are stocked in 2 different profile shapes, both are stocked in white and brown.

E strip features 3 flipper type extrusions

The P strip contains a bubble type compressible section.

Aluminium Extrusions

 

Rubber seals are also present on some of the range of Exitex aluminium door accessories that we stock. Unfortunately, the seals that come included with these products, such as weather bar and thresholds, are not available separately from stock, so please contact us to enquire about the availability of replacement seals with our special orders team.

 

VERSA Universal Seals

If you are unable to identify a suitable seal from the measurements and the options in stock, there are universal type seals by VERSA available which may be suitable for your application.

VERSA offer a range of universal bubble/flipper gaskets in 3 different base sizes, as well as a range of universal wedge gaskets in 3 different code sizes which are often useful for the replacement of gasket that is either hard to identify or which is not stocked and must be ordered in too large a quantity if ordered in via special orders.

VERSA Universal Flipper/Bubble Gasket

The VERSA universal flipper/bubble gasket is capable of use as either a flipper or a bubble gasket due to the design of the flipper blade which meets an upstand on the base to form a full enclosure once compressed. The flipper/bubble gasket can replace multiple other flipper and bubble gaskets with just the 3 sizes in the range, 2.5, 3.5 and 4.8mm bases. It can cover gaps up to 7.3mm and compresses to just 2mm thick, and is able to follow contours on beveled windows. It is supplied in 10m lengths and is a great option for stocking as it covers many applications.

VERSA Universal Wedge Gasket

The VERSA universal wedge gasket is capable of replacing multiple sizes of traditional wedge gasket. 3 sizes are offered, a 2-3mm core, a 4-5mm core and a 6-7mm core. These 3 sizes cover most existing traditional wedge gasket profiles and again they are supplied bagged in 10m lengths offering an excellent option for stockists wanting to cover several bases.

 

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