Sealing Excellence, Securing Industry

CFKS PU IDU Oil Seal 180*196*18 IDU Hydraulic Piston Rod Seal IDU Type U-Ring

The CFKS IDU series is a high-performance, single-acting piston rod seal engineered with a specialized U-ring profile to prevent fluid leakage in demanding hydraulic cylinders. Molded from premium PU, this 180*196*18 seal provides exceptional resistance to extrusion, abrasion, and dynamic pressure spikes, ensuring optimal system pressure maintenance.

  • Optimized U-Ring Profile: Asymmetrical design with a shorter inner lip specifically engineered for superior rod-sealing dynamics.

  • High-Modulus PU Material: Delivers outstanding wear resistance and elasticity compared to standard elastomers, extending service intervals.

  • Heavy-Duty Pressure Rating: Maintains structural integrity and sealing force even under severe pressure fluctuations and mechanical shock.

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

Product Name CFKS IDU Hydraulic Rod Seal Specification 180*196*18 mm
Material Premium Polyurethane (PU / NBR / FKM) Feature High Pressure & Superior Wear Resistance
Work Temperature -20℃ to 220℃ (Material dependent) Hardness 90-95 Shore A
Type U-Ring / Piston Rod Seal Usage Excavators, Forging Presses, Agricultural Rams, Injection Molding, Marine Hydraulics, Cranes

 

The IDU type U-ring operates on a hydrodynamic sealing principle specifically optimized for reciprocating linear motion. Its asymmetric profile features a shortened inner dynamic lip, which increases local contact pressure against the piston rod while reducing friction during the return stroke. When system pressure rises, hydraulic fluid fills the U-cavity, forces the lips outward, and creates a self-regulating axial seal. This mechanism effectively counteracts the centrifugal and axial forces present within heavy-duty hydraulic cylinders, maintaining zero-leakage performance across variable stroke velocities.

 

Material integrity is critical when mitigating premature component failure. This IDU seal is formulated from advanced high-grade PU, bridging the gap between standard NBR elasticity and FKM thermal stability. PU exhibits superior tensile strength and tearing resistance, making it highly immune to gap extrusion when subjected to high-pressure hydraulic mediums. For applications involving extreme thermal thresholds or aggressive synthetic fluids, alternative compounding in NBR or FKM is available to ensure chemical compatibility and prevent thermal degradation.

Designed with practical field maintenance in mind, the elasticity of the premium PU compound allows for straightforward installation into closed housing grooves, minimizing the risk of lip damage during assembly. The high-modulus material ensures low-friction operation, which significantly reduces heat generation along the contact surface, thereby extending both the seal life and the rod finish longevity. Routine maintenance cycles are simplified due to the seal’s excellent shape-retention properties, which eliminate the need for frequent manual adjustments or premature tear-downs.

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
IDU TYPE SEAL SIZE LIST
SIZEMaterialSIZEMaterial
10*16*8NBR115*127*14FKM
12*18*8NBR115*131*18FKM
14*20*8NBR120*132*14FKM
16*22*8NBR120*136*18FKM
16*24*10NBR125*137*14FKM
18*24*8NBR125*141*18FKM
18*26*10NBR130*142*14FKM
20*26*8NBR130*146*18FKM
20*28*10NBR135*147*14FKM
22*28*8NBR140*152*14FKM
22*30*10NBR140*156*18FKM
25*31*8NBR145*157*14FKM
25*33*10NBR145*161*18FKM
28*34*8NBR150*162*14FKM
28*36*10NBR150*166*18FKM
30*38*10NBR155*167*14FKM
32*40*10NBR155*171*18FKM
35*43*10NBR160*172*14FKM
36*44*10NBR160*176*18FKM
40*48*10NBR165*181*18FKM
45*53*10NBR170*186*18FKM
50*58*10NBR175*191*18FKM
50*62*14NBR180*196*18FKM
55*63*10NBR185*201*18FKM
55*67*14NBR190*206*18FKM
56*64*10NBR195*211*18FKM
60*72*14NBR200*216*18FKM
63*75*14NBR200*224*24FKM
65*77*14NBR205*221*18FKM
70*82*14NBR210*226*18FKM
75*87*14NBR215*231*18FKM
80*92*14NBR220*236*18FKM
85*97*14NBR230*246*18FKM
90*102*14NBR240*256*18FKM
95*107*14NBR250*266*18FKM
100*112*14NBR260*276*18FKM
105*117*14NBR270*286*18FKM
105*121*18NBR280*296*18FKM
110*126*18NBR290*306*18FKM

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