Sealing Excellence, Securing Industry

CFKS Nitrile Round Rubber End Cover 14*4 Transmission End Cap EC Oil Seal

The CFKS 14×4 Nitrile Round Rubber End Cover is a premium static boundary component designed specifically for compact power transmissions, gear-reduction units, and electric motors. By encapsulating a rigid internal carbon steel skeleton within a highly durable Nitrile (NBR) elastomeric jacket, this EC-style blind plug provides an absolute, interference-fit barrier. It prevents internal transmission lubricants from weeping while actively excluding environmental dust and abrasive grit from breaching delicate bearing cavities.

  • Absolute Static Sealing: The fully rubberized 14mm outer diameter naturally conforms to minor housing bore imperfections, thermal expansion, and high-frequency machine vibration.

  • Compact 4mm Axial Profile: The slim 4mm width is optimized for shallow transmission housing bores where internal clearance between the plug and the rotating shaft end is strictly limited.

  • Corrosion-Proof Exterior: The continuous Nitrile coating completely isolates the internal metal reinforcement, eliminating the risk of galvanic corrosion between the plug and the aluminum or cast-iron housing.

Find your sealing solution with CFKS — contact us for a quote.

Brand Name CFKS OEM  Accpetable
Material NBR FKM Silicone  Features  wear resistance
Dimensions Customized Certificate  ISO9001/TS16949
Type EC Cap Seal  Packing 1 pc per bag

 

The structural integrity of this end cover relies on precisely calculated radial interference. The internal metal skeleton provides the rigidity necessary to prevent the 14mm cap from buckling or dishing inward under load. Simultaneously, the elastomeric coating compresses firmly against the housing bore. Because rubber behaves as an incompressible fluid when confined, this compression forces the elastomer into the microscopic machining grooves of the casting, creating an absolute static lock that easily withstands internal transmission splashing and thermal cycling.

This advanced formulation is explicitly engineered to handle long-term exposure to standard mineral-based gear oils, petroleum greases, and mild synthetic transmission fluids at operating temperatures up to 100°C. The rubber jacket not only acts as an impenetrable fluid barrier but also functions as a permanent vibration dampener. This ensures the plug will not vibrate loose over the lifespan of the equipment, while providing total immunity against external atmospheric rusting in harsh factory conditions.

Striking the center of the 14x4mm cap will cause the internal metal skeleton to “dish” or cave inward. This deformation instantly pulls the outer diameter away from the bore wall, completely destroying the radial interference fit and guaranteeing an immediate static oil leak. Technicians must use a flat, parallel installation mandrel that distributes force perfectly across the extreme outer edge of the seal. Additionally, wiping a very light film of system-compatible oil on the rubber OD prior to installation prevents the elastomer from binding, rolling, or tearing against the housing chamfer during the press-fit operation.

Frequently Asked Questions (FAQ)

Why does my CFKS oil seal fail prematurely? Common causes and prevention tips2025-06-26T15:44:39+08:00

Premature oil seal failure can result from improper installation, poor shaft finish, incorrect material selection, or excessive pressure. To prevent this, ensure the shaft surface is smooth and within tolerance, use correct tools during installation, and choose seals made from materials compatible with your media and temperature.

How to correctly install a CFKS industrial oil seal to avoid leakage2025-06-26T16:04:32+08:00

Always clean the shaft and bore before installation. Use appropriate seal drivers to avoid deformation. Lubricate the lip before fitting to reduce friction during the first rotation. Ensure the seal is seated evenly and not tilted to avoid leaks.

What to do when your CFKS hydraulic seal is leaking under pressure2025-05-20T16:33:14+08:00

Check if the pressure exceeds the seal’s rated limit. Examine for wear, hardening, or improper installation. Replace the seal if damaged, and consider upgrading to a high-pressure CFKS seal variant. Also, verify that the housing and shaft are properly aligned.

How to choose the right CFKS oil seal for extreme operating environments2025-05-20T16:34:39+08:00

For high temperatures, aggressive chemicals, or abrasive environments, choose CFKS seals made of FKM, PTFE, or high-performance elastomers. Consider using seals with protective dust lips or metal casing. Our team can recommend the best fit for your application.

CFKS Seal Manufacturing Co., Ltd.
https://cfksseals.com/
 Email: cfksnacy@gmail.com  Mobile/WhatsApp/Wechat: (86) 188-3097-5917
EC End Cap Oil Seal Size List
TypeSIZE
EC End Cap Oil SealEC8*4
EC End Cap Oil SealEC10*4
EC End Cap Oil SealEC11*7
EC End Cap Oil SealEC12*4
EC End Cap Oil SealEC12*5
EC End Cap Oil SealEC14*4
EC End Cap Oil SealEC15*4
EC End Cap Oil SealEC15*5
EC End Cap Oil SealEC16*4
EC End Cap Oil SealEC16*5
EC End Cap Oil SealEC16*6
EC End Cap Oil SealEC18*4
EC End Cap Oil SealEC20*4
EC End Cap Oil SealEC20*5
EC End Cap Oil SealEC20*6
EC End Cap Oil SealEC20*7
EC End Cap Oil SealEC22*4
EC End Cap Oil SealEC22*4
EC End Cap Oil SealEC22*5
EC End Cap Oil SealEC22*5
EC End Cap Oil SealEC22*7
EC End Cap Oil SealEC23*4
EC End Cap Oil SealEC24*5
EC End Cap Oil SealEC24*5
EC End Cap Oil SealEC24*7
EC End Cap Oil SealEC24*7
EC End Cap Oil SealEC25*5
EC End Cap Oil SealEC25*6
EC End Cap Oil SealEC25*7
EC End Cap Oil SealEC25*7
EC End Cap Oil SealEC25*8
EC End Cap Oil SealEC26*4
EC End Cap Oil SealEC26*5
EC End Cap Oil SealEC26*6
EC End Cap Oil SealEC26*6
EC End Cap Oil SealEC26*7
EC End Cap Oil SealEC26*8
EC End Cap Oil SealEC27*5
EC End Cap Oil SealEC27*5
EC End Cap Oil SealEC28*4
EC End Cap Oil SealEC28*5
EC End Cap Oil SealEC28*5
EC End Cap Oil SealEC28*6
EC End Cap Oil SealEC28*7
EC End Cap Oil SealEC28*8

 

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