Sealing Excellence, Securing Industry

CFKS DC Oil Seal 27*37*10.5 NBR DC Rotary Seal Leakage-free DC Double Lip Seal

The CFKS DC-type oil seal 27*37*10.5 is a high-performance rotary shaft seal featuring a reinforced double-lip design to ensure zero-leakage performance in demanding industrial environments. It provides an optimal balance between low friction and maximum sealing integrity, specifically designed for high-speed rotational applications where primary and secondary protection are non-negotiable.

  • Dual-Lip Protection: Primary lip for fluid retention and a secondary dust lip to prevent external contamination.

  • Precision Engineering: Optimized spring-loaded tensioning for consistent radial pressure on the shaft.

  • Rapid Heat Dissipation: Specialized NBR formulation reduces thermal buildup, extending service intervals.

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

Parameter Value Parameter Value
Product Name CFKS DC Oil Seal Specification 27*37*10.5
Material High-Grade NBR / FKM / PU Feature High Pressure & Wear Resistance
Work Temp -20℃ to 220℃ Hardness 70 – 90 Shore A
Type DC Double Lip Rotary Seal Usage Pumps, Motors, Gearboxes, Axles, Fans, Agricultural Machinery

The DC profile is engineered as a bidirectional rotary seal that utilizes a primary sealing lip reinforced by a garter spring to counteract centrifugal forces and shaft run-out. Unlike standard single-lip seals, the DC design incorporates an auxiliary dust lip. This configuration creates a labyrinth effect, effectively trapping lubricants while simultaneously blocking ingress from environmental debris. This dual-action mechanism is critical for maintaining pressure balance within the housing during high-frequency shaft rotation.

The standard NBR variant offers excellent resistance to petroleum-based oils, hydraulic fluids, and water, making it the workhorse for general industrial machinery. For applications involving high-temperature cycles or aggressive chemical media, we provide FKM alternatives. FKM exhibits superior oxidative stability and remains resilient at temperatures exceeding 200°C, ensuring the seal’s elastomer memory is maintained even under extreme thermal stress, preventing the hardening and cracking that leads to catastrophic failure.

Successful implementation of the DC oil seal relies on precise bore alignment and shaft finish. The metal-insert reinforced OD provides a secure press-fit, preventing “pop-out” during thermal expansion. Maintenance requirements are significantly reduced due to the low-friction lip geometry, which minimizes shaft wear. During installation, we recommend pre-lubricating the lips to prevent dry-start friction, ensuring a seamless transition into the operating cycle and extending the total life of the rotary assembly.

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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