Sealing Excellence, Securing Industry

CFKS Hydraulic Cylinder U+S Oil Seal 65*80*10 Polyurethane U+S Oil Seal U+S Rod and Piston Seal

Engineered for dual-purpose application in dynamic hydraulic systems, the CFKS Polyurethane U+S Seal 65*80*10 provides superior fluid containment across both rod and piston sealing configurations. Formulated from premium injection-molded polyurethane, this U-cup profile delivers exceptional extrusion resistance, structural stability, and reliable dynamic sealing under fluctuating system pressures.

  • Dual-Lip Versatility: Optimized geometry functions seamlessly as both a piston and rod seal, reducing inventory complexity.

  • Wear-Resistant Polyurethane: Premium high-grade PU compound resists abrasion, micro-pitting, and extrusion up to 35 MPa.

  • Precise 65*80*10 Profile: Precision-machined cross-section guarantees low break-out friction and instantaneous sealing responsiveness.

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

Product Name CFKS Hydraulic U+S Oil Seal Specification 65*80*10 mm (Customization Supported)
Material Polyurethane (PU) Feature High Wear Resistance, Extrusion Proof
Work Temperature -35℃ to 110℃ Usage Hydraulic Cylinders, Excavators, Presses, Loaders, Injection Machines
Hardness 90–95 Shore A Type U+S Rod and Piston Seal

 

The U+S profile operates on a pressure-energized flexible lip design tailored for dynamic hydraulic reciprocating motion. Upon installation into a closed groove, the asymmetric dynamic sealing lips establish initial mechanical pre-load against the housing bore or cylinder rod. As hydraulic working pressure increases, fluid forces expand the outer and inner lips radially, amplifying contact pressure in direct proportion to system load. This self-energizing mechanism maintains optimal sealability across low-pressure hold and high-pressure surge cycles while minimizing friction-induced heat build-up.

Manufactured from high-performance PU, the CFKS U+S seal exhibits significantly higher tensile strength and tear resistance compared to conventional NBR. Polyurethane maintains outstanding physical stability when exposed to mineral oils, synthetic hydraulic fluids, and grease media. Its elevated modulus of elasticity prevents material nibbling and extrusion into hardware clearance gaps under extreme peak pressures, while maintaining flexibility in temperatures ranging from -35°C to 110°C.

The compact 65*80*10 mm profile allows straightforward snap-fit installation into standard closed housing grooves without requiring specialized disassembly tools. To prevent lip damage during assembly, all shaft entry chamfers should be free of sharp burrs and pre-lubricated with compatible hydraulic oil. Thanks to the low compression set and anti-aging properties of polyurethane, the CFKS U+S seal provides extended service intervals, eliminating frequent system teardowns and minimizing unplanned production downtime.

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
U+S Seal Size List
TypeMaterialSIZE
U+S Hydraulic Oil sealPU+NBR4*10*4
U+S Hydraulic Oil sealPU+NBR4*11*5
U+S Hydraulic Oil sealPU+NBR4.5*9.5*4
U+S Hydraulic Oil sealPU+NBR5*12*5.5
U+S Hydraulic Oil sealPU+NBR5*12*6
U+S Hydraulic Oil sealPU+NBR5*12*8
U+S Hydraulic Oil sealPU+NBR5*14*8
U+S Hydraulic Oil sealPU+NBR6*12*5
U+S Hydraulic Oil sealPU+NBR6*12*5.5
U+S Hydraulic Oil sealPU+NBR6.3*16.3*8
U+S Hydraulic Oil sealPU+NBR7.1*17.1*8
U+S Hydraulic Oil sealPU+NBR8*14*6
U+S Hydraulic Oil sealPU+NBR8*14*8
U+S Hydraulic Oil sealPU+NBR8*16*5.7
U+S Hydraulic Oil sealPU+NBR8*16*6
U+S Hydraulic Oil sealPU+NBR8*16.8
U+S Hydraulic Oil sealPU+NBR8*18*8
U+S Hydraulic Oil sealPU+NBR8*22*10
U+S Hydraulic Oil sealPU+NBR9*19*8
U+S Hydraulic Oil sealPU+NBR10*16*6
U+S Hydraulic Oil sealPU+NBR10*18*5.5
U+S Hydraulic Oil sealPU+NBR10*18*6
U+S Hydraulic Oil sealPU+NBR10*18*8
U+S Hydraulic Oil sealPU+NBR10*20*8
U+S Hydraulic Oil sealPU+NBR10*22*6
U+S Hydraulic Oil sealPU+NBR10*22*8
U+S Hydraulic Oil sealPU+NBR10*19.2*5
U+S Hydraulic Oil sealPU+NBR28*36*6
U+S Hydraulic Oil sealPU+NBR28*36*8
U+S Hydraulic Oil sealPU+NBR28*38*6
U+S Hydraulic Oil sealPU+NBR28*38*8
U+S Hydraulic Oil sealPU+NBR28*40*8
U+S Hydraulic Oil sealPU+NBR28*40*10
U+S Hydraulic Oil sealPU+NBR28*43*10
U+S Hydraulic Oil sealPU+NBR28*44*8
U+S Hydraulic Oil sealPU+NBR30*37*6
U+S Hydraulic Oil sealPU+NBR30*38*5
U+S Hydraulic Oil sealPU+NBR30*38*6
U+S Hydraulic Oil sealPU+NBR30*38*7

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