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CFKS DC Type Rotary Seal 27*39*10.5 Heat Resistant FKM Black DC Oil Seal DC Skeleton Oil Seal

The CFKS DC Type Rotary Oil Seal 27*39*10.5 provides reliable fluid retention and dirt exclusion for rotating shafts operating under severe thermal and mechanical stress. Molded from premium FKM with a reinforced metal skeleton, this dual-lip rotary seal handles continuous high-speed rotation without degrading under aggressive lubricants or chemical exposure.

  • High-Temp Resistance: Built from FKM rubber rated for constant operational temperatures up to 220°C.

  • Dual-Lip Exclusion: Secondary dust lip blocks external debris, particulate matter, and moisture.

  • Structural Stability: Internal steel casing maintains radial force and steady seating within the housing bore.

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

Product Name CFKS DC Type Rotary Oil Seal Specification 27*39*10.5 mm (Customization Supported)
Material FKM  / Steel Feature Heat Resistant, Wear Resistant, High Pressure
Work Temperature -20℃ to 220℃ Usage Pumps, Gearboxes, Motors, Driveshafts, Compressors, Axles
Hardness 70–75 Shore A Type DC Skeleton Rotary Oil Seal

The DC Type skeleton oil seal functions as an elastomeric dynamic barrier engineered specifically for high-speed rotary shaft applications. Utilizing a micro-machined sealing lip pressed lightly against the rotating journal by a garter spring, the seal relies on a microscopic hydrodynamic fluid film to limit direct contact and friction. As the shaft turns, centrifugal forces together with the secondary wiper lip deflect dust, mud, and water splash away from the internal bearing cavity, protecting the primary seal line from premature abrasive wear.

Formulated from premium FKM, this seal withstands synthetic gear oils, engine lubricants, fuel vapors, and hydraulic fluids that degrade standard NBR. FKM maintains its elastic recovery, tensile strength, and lip geometry across extreme temperature sweeps from -20°C to 220°C. The integrated carbon steel inner casing resists distortion under press-fit loads, maintaining proper interference fit inside the housing bore even during severe thermal expansion.

Proper installation requires deburring the housing bore and applying a light film of system lubricant to the sealing lip and shaft journal prior to press fitting. Drive the seal squarely into the bore using an arbor press or flat installation tool that contacts the outer metallic casing directly—never apply force to the elastomeric lip or spring channel. During routine inspection, verify shaft surface finish and hardness to maximize service life and eliminate grooving.

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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