Sealing Excellence, Securing Industry

CFKS O-Ring Kit Oil Resistant NBR O-Ring Gasket Set For Hydraulic Cylinder Excavator Automotive

Engineered for heavy-duty industrial applications, the CFKS Oil-Resistant NBR O-Ring Kit provides a comprehensive sealing solution designed to prevent hydraulic fluid leaks, pressure drops, and contamination in high-stress operating environments. Constructed from premium elastomeric compounds, each gasket ensures optimal radial compression and long-term elasticity across extreme temperature and pressure cycles.

  • Superior Oil & Fluid Resistance: Formulated specifically to resist degradation when exposed to petroleum-based oils, hydraulic fluids, and grease.

  • Precision Engineered Elasticity: High-tensile elastomer prevents compression set, maintaining a tight, leak-proof seal under fluctuating system pressures.

  • Heavy-Duty Versatility: Fully organized assortment sized for immediate field repair of excavators, automotive engines, hydraulic cylinders, and pumps.

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

Product Name CFKS Oil-Resistant NBR O-Ring Kit Specification Universal Assortment (Custom Sizes Available)
Material Nitrile Rubber (NBR) / FKM Options Feature Oil-Resistant, High Wear Resistance & Leak-Proof
Work Temperature -20℃ to 220℃ Hardness 70 Shore A / 90 Shore A
Type Assorted O-Ring Gasket Set Usage Hydraulic Cylinders, Excavators, Automotive Engines, Pumps, Compressors

 

 

O-ring gaskets operate as dynamic and static bi-directional seals by leveraging mechanical deformation within a designated gland groove. Under initial installation, static squeeze creates a low-pressure initial seal across the mating surfaces. As system pressure increases, the elastomeric body behaves like a high-viscosity incompressible fluid, transferring force evenly across the axial and radial sealing planes. This self-sealing capability prevents fluid bypass under peak hydraulic surges while preserving structural integrity against extrusion.

Selecting the right elastomeric formulation is critical to preventing premature seal failure caused by chemical swelling or thermal hardening. Standard NBR variants offer outstanding resistance to mineral oils, hydraulic fluids, and mechanical abrasion, rendering them ideal for heavy machinery operating within standard thermal windows. For elevated operational temperatures or chemically aggressive synthetic fluids, upgraded FKM configurations are integrated to deliver enhanced thermal stability and oxidation resistance, significantly extending overall mean time between failures.

To maximize seal service life and prevent early extrusion, proper gland preparation and installation practices are essential. Surfaces should be thoroughly cleaned of particulate contaminants and deburred to avoid nicking the elastomeric surface during insertion. Thanks to the highly resilient elastomeric memory of CFKS O-rings, field replacement can frequently be accomplished without requiring extensive teardown of adjacent shaft assemblies. Applying a light lubricant film compatible with the system fluid during assembly reduces initial friction, ensuring seamless seating and immediate operational readiness.

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
O-Ring Size List
DescriptionNO.I.D.±W.
AS-568A UNIVERSAL NUMBERSAS-0010.74 0.10 1.02 
AS-568AUNIVERSAL NUMBERSAS-0021.07 0.10 1.27 
AS-568A UNIVERSAL NUMBERSAS-0031.42 0.10 1.52 
AS-568A UNIVERSAL NUMBERSAS-0041.78 0.12 1.78 
AS-568A UNIVERSAL NUMBERSAS-0052.57 0.12 1.78 
AS-568A UNIVERSAL NUMBERSAS-0062.90 0.12 1.78 
AS-568A UNIVERSAL NUMBERSAS-0073.68 0.12 1.78 
AS-568A UNIVERSAL NUMBERSAS-0084.47 0.12 1.78 
AS-568A UNIVERSAL NUMBERSAS-0095.28 0.12 1.78 
AS-568A UNIVERSAL NUMBERSAS-0106.07 0.12 1.78 
AS-568A UNIVERSAL NUMBERSAS-0117.65 0.12 1.78 
AS-568A UNIVERSAL NUMBERSAS-0129.25 0.12 1.78 
AS-568A UNIVERSAL NUMBERSAS-01310.82 0.12 1.78 
AS-568A UNIVERSAL NUMBERSAS-01412.42 0.12 1.78 
AS-568A UNIVERSAL NUMBERSAS-01514.00 0.12 1.78 
AS-568A UNIVERSAL NUMBERSAS-01615.60 0.12 1.78 
AS-568A UNIVERSAL NUMBERSAS-01717.17 0.12 1.78 
AS-568A UNIVERSAL NUMBERSAS-01818.77 0.12 1.78 
AS-568A UNIVERSAL NUMBERSAS-01920.35 0.15 1.78 
AS-568A UNIVERSAL NUMBERSAS-02021.95 0.15 1.78 
AS-568A UNIVERSAL NUMBERSAS-02123.52 0.15 1.78 
AS-568A UNIVERSAL NUMBERSAS-02225.12 0.15 1.78 
AS-568A UNIVERSAL NUMBERSAS-02326.70 0.15 1.78 
AS-568A UNIVERSAL NUMBERSAS-02428.30 0.15 1.78 
AS-568A UNIVERSAL NUMBERSAS-02529.87 0.15 1.78 
AS-568AUNIVERSAL NUMBERSAS-02631.47 0.15 1.78 
AS-568A UNIVERSAL NUMBERSAS-02733.05 0.15 1.78 

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