Sealing Excellence, Securing Industry

CFKS NBR FKM Standard Bonded Seal Dowty Washer Bonded Washer Rubber Sealing Bonded Seal

CFKS offers premium Bonded Seals (also known as Dowty Washers) made from NBR and FKM rubber, bonded to a precision steel washer for optimal sealing performance. Designed for use in high-pressure hydraulic systems, oil and gas lines, and general industrial applications, these rubber sealing bonded washers ensure leak-proof reliability between threaded components and flanges. Available in standard metric and imperial sizes, our metal bonded seals provide excellent resistance to oil, fuel, temperature extremes, and chemical exposure.

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

 

CFKS Bonded Seals—also known as Dowty Washers—are engineered to provide secure, high-pressure sealing for hydraulic, pneumatic, and fluid transfer systems. Made with NBR (Nitrile Rubber) or FKM (Viton® Rubber) bonded to a galvanized or stainless steel washer, these sealing washers ensure zero leakage under extreme temperature and pressure variations. Whether you’re repairing hydraulic pumps or maintaining industrial pipe connections, CFKS rubber bonded seals offer dependable performance in static applications.

Our bonded washers are manufactured using high-quality NBR for general industrial applications and FKM for high-temperature and chemical-resistant environments. These FKM bonded seals are ideal for sealing oils, fuels, and aggressive chemicals in automotive, marine, aerospace, and machinery systems. With precision-molded rubber and metal bonding, CFKS Bonded Seals provide superior resistance to extrusion and long-term sealing integrity—making them the go-to choice for OEMs and maintenance professionals alike.

At CFKS, we offer Bonded Seals in a wide range of standard sizes, including both metric and inch specifications, ensuring compatibility with global equipment standards. Need a custom bonded seal or a special dimension? Our in-house engineering team can provide tailored sealing solutions with short lead times. All CFKS Dowty Bonded Washers are packaged for ease of use in repair kits or bulk supply, making them a trusted choice for distributors, resellers, and end-users worldwide.

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.

 

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