Sealing Excellence, Securing Industry

CFKS KDAS Compact Seal 50*34*31.1 High Pressure KDAS Hydraulic Cylinder Seals Industrial Piston Seal Ring

The CFKS KDAS 50*34*31.1 compact seal provides an all-in-one sealing solution engineered to withstand severe pressure spikes and harsh operating conditions in heavy-duty hydraulic cylinders. Designed with an integrated structure featuring a rubber sealing element, polyester elastomer support rings, and polyacetal guide rings, it delivers reliable bi-directional sealing with minimal friction and extended service life.

  • High-Pressure Resistance: Handles pressures up to 35 MPa without extrusion or distortion.

  • Integrated Five-Piece Design: Combines sealing, guiding, and anti-extrusion functions into a single compact groove.

  • Superior Wear Durability: NBR seal with robust thermoplastic components ensures exceptional longevity.

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

Product Name KDAS Compact Seal  Specification 50*34* 31.1mm (Custom Available)
Material NBR / POM / TPC (FKM Optional) Feature High Pressure, Anti-Extrusion, Low Friction
Work Temperature -30℃ to 110℃ (NBR) / -20℃ to 200℃ (FKM) Usage Excavators, Presses, Injection Molding, Cranes, Agricultural Rams
Hardness 70 – 80 Shore A (Elastomer) Type Double-Acting Compact Piston Seal

 

The KDAS compact double-acting seal operates on a pressure-energized sealing mechanism designed specifically for double-acting hydraulic pistons. Under low pressure, the initial radial interference of the central elastomer ring provides precise static sealing across the dynamic interface. As system pressure increases, the hydraulic medium deforms the elastomeric element, transferring hydrostatic force to the dynamic sealing lips and the split guide rings. The anti-extrusion back-up rings prevent gap extrusion under high-pressure spikes, maintaining structural stability, reducing breakout friction, and ensuring zero leakage throughout bi-directional piston movement.

Material selection directly determines the operational integrity of the KDAS seal profile in aggressive industrial environments. The primary seal ring is crafted from high-density NBR, offering superior resilience, low compression set, and optimal compatibility with mineral oils and hydraulic fluids. Flanking thermoplastic polyester elastomer support rings provide mechanical rigidity against high shear stress, while wear-resistant polyacetal guide rings act as integrated bearing surfaces to absorb radial loads and prevent metal-to-metal contact. For extreme thermal or chemical environments, FKM configurations are available to resist synthetic fluids and elevated temperatures.

The self-retaining, compact geometry of the KDAS 50*34*31.1 seal simplifies maintenance and lowers total installation time. Featuring a split-ring configuration for the wear guide components, the assembly can be snapped into closed grooves sequentially without requiring specialized expansion tools or complete shaft disassembly. During maintenance cycles, inspect the dynamic sealing lip for uniform wear patterns and clean the cylinder bore to remove abrasive particulate build-up. Proper lubrication during initial insertion ensures low initial friction and prolongs the service life of both the dynamic lip and cylinder wall.

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
DAS/KDAS Size List
Type SIZE
DAS/KDAS Combination Seal 20*11*17.7
DAS/KDAS Combination Seal 22*13*17.7
DAS/KDAS Combination Seal 25*15*20.5
DAS/KDAS Combination Seal 25*15/1*29.1
DAS/KDAS Combination Seal 25*16*17.7
DAS/KDAS Combination Seal 28*19*17.7
DAS/KDAS Combination Seal 30*21*17.7
DAS/KDAS Combination Seal 32*22/1*20.7
DAS/KDAS Combination Seal 32*22*29.1
DAS/KDAS Combination Seal 32*24*21.9
DAS/KDAS Combination Seal 35*25/1*20.7
DAS/KDAS Combination Seal 35*25*29.1
DAS/KDAS Combination Seal 40*24*31.1
DAS/KDAS Combination Seal 40*26*20.7
DAS/KDAS Combination Seal 40*30*29.1
DAS/KDAS Combination Seal 40*30/1*20.5-
DAS/KDAS Combination Seal 40*30/2*20.5+
DAS/KDAS Combination Seal 42*28*20.7
DAS/KDAS Combination Seal 45*29*31.1
DAS/KDAS Combination Seal 45*31*20.7
DAS/KDAS Combination Seal 45*35*29.1
DAS/KDAS Combination Seal 50*34/1*26.7
DAS/KDAS Combination Seal 50*34*31.1
DAS/KDAS Combination Seal 160*135*44.4
DAS/KDAS Combination Seal 160*143*40.9
DAS/KDAS Combination Seal 160*138*36.7
DAS/KDAS Combination Seal 165*140*44.4
DAS/KDAS Combination Seal 170*145*50.8
DAS/KDAS Combination Seal 175*150*50.8
DAS/KDAS Combination Seal 180*155*50.8
DAS/KDAS Combination Seal 180*150*48.1
DAS/KDAS Combination Seal 185*160*50.8
DAS/KDAS Combination Seal 190*165*50.8
DAS/KDAS Combination Seal 195*170*50.8
DAS/KDAS Combination Seal 200*175*50.8
DAS/KDAS Combination Seal 210*185*50.8
DAS/KDAS Combination Seal 220*190*48.1
DAS/KDAS Combination Seal 220*195*50.8
DAS/KDAS Combination Seal 230*205*50.8
DAS/KDAS Combination Seal 240*215*50.8
DAS/KDAS Combination Seal 250*225*50.8
DAS/KDAS Combination Seal 250*220*48.1
DAS/KDAS Combination Seal 260*235*60.5
DAS/KDAS Combination Seal 275*250*48.3
 

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