Sealing Excellence, Securing Industry

CFKS NBR DC Oil Seal 26*37*10.5 DC Rotary Seal Leakage-free DC Double Lip Seal

The CFKS DC Series Oil Seal is a precision-engineered rotary shaft seal designed to prevent lubricant leakage and protect internal components from external contaminants. Its dual-lip configuration ensures a high-efficiency barrier for demanding industrial environments.

  • Dual-Lip Design: Primary sealing lip for oil retention and a secondary dust lip for environmental protection.

  • Optimal Compression: Engineered for a perfect fit on 26mm shafts, reducing friction and heat buildup.

  • Superior NBR Compound: High resistance to mineral oils, hydraulic fluids, and grease.

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

Parameter Value Parameter Value
Product Name CFKS DC Oil Seal Specification 26*37*10.5
Material NBR / FKM / PU Feature High Pressure & Wear Resistance
Work Temp -20℃ to 220℃  Usage Gearboxes, Pumps, Electric Motors, Agricultural machinery, Construction equipment
Hardness 70 – 90 Shore A Type DC Double Lip Rotary Seal

The DC-type oil seal operates on the principle of radial lip sealing combined with axial stability. The primary sealing lip is energized by a garter spring, which maintains a constant radial force on the rotating shaft. This creates a precise hydrodynamic film that prevents fluid bypass even during high-frequency oscillations. The auxiliary lip acts as a secondary shield, effectively blocking the ingress of dust, moisture, and debris that could compromise the integrity of the primary seal.

While this specific model utilizes high-grade NBR for its excellent balance of cost and performance in standard oil environments, CFKS also offers FKM variants for extreme conditions. NBR is the material of choice for temperatures up to 100°C and provides exceptional resistance to abrasion and tearing. For applications involving synthetic lubricants or temperatures exceeding 200°C, our FKM compounds offer the chemical inertness required to prevent thermal hardening and elastomer degradation.

A key advantage of the CFKS DC seal is its ease of installation and low-friction profile, which significantly extends the Mean Time Between Maintenance. Unlike complex mechanical seals, the DC oil seal allows for rapid replacement without extensive system teardowns. Its flexible elastomer outer diameter compensates for housing tolerances, ensuring a static seal that prevents “weeping” around the outer edge, even in housings with minor surface imperfections.

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
DC Type Oil Seal Size List
SIZEMaterialTYPE
52*72*8NBR/FKM/VitonDC Type Oil Seal
50*70*12NBR/FKM/VitonDC Type Oil Seal
50*65*10NBR/FKM/VitonDC Type Oil Seal
45*72*12NBR/FKM/VitonDC Type Oil Seal
48*72*12NBR/FKM/VitonDC Type Oil Seal
45*70*12NBR/FKM/VitonDC Type Oil Seal
45*70*10NBR/FKM/VitonDC Type Oil Seal
45*65*10NBR/FKM/VitonDC Type Oil Seal
45*62*12NBR/FKM/VitonDC Type Oil Seal
45*60*12NBR/FKM/VitonDC Type Oil Seal
45*60*10NBR/FKM/VitonDC Type Oil Seal
40*72*10NBR/FKM/VitonDC Type Oil Seal
40*65*12NBR/FKM/VitonDC Type Oil Seal
40*65*8NBR/FKM/VitonDC Type Oil Seal
40*62*12NBR/FKM/VitonDC Type Oil Seal
40*62*8NBR/FKM/VitonDC Type Oil Seal
40*60*10NBR/FKM/VitonDC Type Oil Seal
35*56*12NBR/FKM/VitonDC Type Oil Seal
30*50*10NBR/FKM/VitonDC Type Oil Seal
30*50*8NBR/FKM/VitonDC Type Oil Seal
48*68*10NBR/FKM/VitonDC Type Oil Seal
60*85*12NBR/FKM/VitonDC Type Oil Seal
60*80*12NBR/FKM/VitonDC Type Oil Seal
60*80*10NBR/FKM/VitonDC Type Oil Seal
60*80*8NBR/FKM/VitonDC Type Oil Seal
26*37*10.5NBR/FKM/VitonDC Type Oil Seal
37*37*10.5NBR/FKM/VitonDC Type Oil Seal
30*42*10.5NBR/FKM/VitonDC Type Oil Seal
30*42*11NBR/FKM/VitonDC Type Oil Seal
33*45*10.5NBR/FKM/VitonDC Type Oil Seal
33*46*11NBR/FKM/VitonDC Type Oil Seal
31*43*10.3NBR/FKM/VitonDC Type Oil Seal
31*43*10.5NBR/FKM/VitonDC Type Oil Seal
50*65*11.5NBR/FKM/VitonDC Type Oil Seal
43*55*11NBR/FKM/VitonDC Type Oil Seal
35*48*11NBR/FKM/VitonDC Type Oil Seal
37*50*11NBR/FKM/VitonDC Type Oil Seal
27*39*10.5NBR/FKM/VitonDC Type Oil Seal
32*44*8NBR/FKM/VitonDC Type Oil Seal
32*44*10.5NBR/FKM/VitonDC Type Oil Seal

 

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