Sealing Excellence, Securing Industry

CFKS UHS Oil Seal 35*45*7 UHS Polyurethane Hydraulic Cylinder Seal U-Cup Piston Seal

Engineered for demanding fluid power systems, the CFKS 35*45*7 UHS Polyurethane Hydraulic Cylinder Seal delivers exceptional dynamic and static sealing performance across both piston and rod applications. Molded from high-grade polyurethane (PU), this compact symmetrical U-cup profile prevents pressure bypassing, withstands shock loads, and resists mechanical wear, ensuring prolonged service life in heavy-duty industrial and mobile machinery.

  • Symmetrical U-Cup Geometry: Dual-lip profile functions effortlessly as both a rod seal and a piston seal, simplifying inventory and installation.

  • Extrusion-Resistant Polyurethane: High tensile strength and abrasion resistance prevent lip nibbling under high operating pressures up to 31.5 MPa.

  • Compact 35*45*7 mm Metric Fit: Precision-molded for seamless snap-in retrofit into standard closed gland housings without structural modifications.

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

Product Name CFKS UHS Hydraulic Cylinder Oil Seal Specification 35*45*7 mm (Customization Supported)
Material High-Grade Polyurethane (PU) Feature High Pressure Resistance, Anti-Extrusion, High Wear Resistance
Work Temperature -35℃ to 100℃ Hardness 90–95 Shore A
Type UHS Symmetrical U-Cup Seal Usage Excavator Cylinders, Hydraulic Presses, Injection Molding Units, Wheel Loaders, Dump Truck Hoists, Forklifts

 

The CFKS UHS seal utilizes a pressure-energized symmetrical U-cup geometry designed for low-to-medium-speed reciprocating hydraulic systems. When system pressure increases, fluid forces expand the inner and outer seal lips radial outward against the cylinder bore and rod walls. This dynamic pressure response reinforces seal contact stress precisely when peak load occurs, maintaining absolute zero-leakage containment while minimizing friction during low-pressure strokes.

Formulated from premium thermoset Polyurethane (PU), this seal excels where conventional rubber profiles fail under severe friction and tear forces. The material features outstanding hydrolysis resistance, low compression set, and exceptional compatibility with standard mineral-based hydraulic oils. Its dense polymer matrix prevents material degradation and lip erosion when subjected to high-frequency pressure spikes, continuous shearing forces, and abrasive particulate contamination.

Featuring high elastic memory and flexibility, the 35*45*7 mm UHS seal allows effortless snap-in installation into standard ISO-compliant closed grooves without requiring complex specialized alignment tooling or disassembling major cylinder housings. To prevent edge rollover or lip damage during assembly, ensure all gland chamfers are deburred and lubricated with clean hydraulic fluid prior to insertion.

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
TCV TYPE SEAL SIZE LIST
SizeTypeMaterialColor
12*30*5BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
13*19*2.5BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
14*25*7BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
16*30*7BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
17*30*6BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
17*30.3*8BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
17*32*7BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
17*35*7BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
17.46*28.58*5.7/6.3BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
18*30*10BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
18*30*6BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
18*35*6BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
18*35*8BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
18*35*9BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
19*27*5BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
19*30*6BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
19*32*6BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
19.5*33*7BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
19*35*6BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
19.5*30*6/6.5BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
19*35*6BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
19*35*8BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
19*35*3/7BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
19*37*6.5/7.5BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
19*44.45*6.35BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
20*32*6BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
20*32*7BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
20*35*7BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
20*40*7BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
20*47*6BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
20*47*7BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
22*30*6BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
22*32*6BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
20*32*6.5/8.6BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
22*35*6BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
22*36*10BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
22*36*7BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
22*42*10BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
24*34*6.3BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
24*38*6/7BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
24*38*8BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
24*55*6BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
25*33*6BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN
25*35*6BABSL CFW / TCV OIL SEALNBR/FKMBLUE/BROWN

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