Sealing Excellence, Securing Industry

CFKS Cassette Oil Seal 35*52*17/18.5 NBR FKM High Temperature Combination Shaft Seal

  • The CFKS Cassette Oil Seal 35*52*17/18.5 is an integrated, multi-lip sealing solution engineered specifically for severe-duty applications exposed to extreme contamination. By combining a shaft sleeve, elastomeric sealing elements, and dynamic dust deflectors into a single pre-assembled unit, this combination seal isolates internal lubricants while blocking harsh external mud, water, and debris.

    • Unitized Multi-Lip Defense: Combines internal axial/radial sealing lips with integrated counter-faces to eliminate shaft wear and prevent particle ingress.

    • Versatile Elastomer Options: Available in NBR for standard industrial durability or FKM for high-temperature and harsh chemical exposure.

    • Extended Service Life: Reduces friction-induced thermal buildup and shaft grooving, significantly lengthening mean time between maintenance .

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

Product Name CFKS Cassette Oil Seal Specification 35*52*17/18.5mm (Customization Supported)
Material NBR / FKM / PU (Polyurethane) Feature High Temperature, Wear Resistant, Mud/Dust Proof
Work Temperature -30℃ to 220℃ (Material Dependent) Usage Wheel Hubs, Axles, Reduction Gearboxes, Construction Machinery, Agricultural Drives
Hardness 70 – 80 Shore A Type Combination / Cassette Shaft Seal

 

 

 

The CFKS combination cassette seal operates as a self-contained sealing system where the internal sleeve rotates relative to the outer housing shell. Unlike traditional radial shaft seals that run directly on an expensive, finely ground shaft surface, the CFKS seal runs against its own internal, pre-finished wearing surface. As the shaft rotates, centrifugal force acts on the elastomeric deflector lips, slinging external mud, dust, and slurries away from the primary sealing lip. This multi-stage axial and radial barrier maintains optimal contact pressure, ensuring reliable fluid retention even under moderate dynamic runout and heavy vibratory loads.

 

Material selection directly determines seal performance across varying operational environments. The standard NBR variant offers exceptional resistance to petroleum-based oils, greases, and hydraulic fluids, functioning reliably in operating environments from -30°C to 100°C. For heavy-duty drives exposed to elevated thermal stresses or aggressive synthetic lubricants, the FKM compound is recommended. FKM provides superior chemical inertness, high-temperature stability, and low degradation rates when subjected to continuous temperatures reaching up to 220°C, preserving elastomeric memory and seal integrity over thousands of operational hours.

A major operational advantage of the unitized CFKS cassette structure is the simplification of assembly lines and field maintenance. Because the seal includes its own running surface, maintenance teams no longer need to re-machine or replace grooved shafts during overhauls. Installation is executed as a single-step press-fit process, eliminating common installation errors such as lip inversion or spring displacement. The low-friction elastomeric contact design minimizes heat generation during high-speed rotation, effectively reducing drive power losses while protecting critical internal bearings from premature failure.

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
CASSETTE Oil Seal Size List
SIZEMaterialTYPE
35*52*16NBR+AUCOMBI
35*52*17/18.5NBR+AUCOMBI SF
40*55*15.5NBR+AUCOMBI SF6
37*52*14.6NBR+AUCOMBI SF6
42*62*17NBR+AUCOMBI SF1
45*60*16/17NBR+AUCOMBI SF
45*62*19NBR+AUCOMBI SF20
45*65*18.5NBR+AUCOMBI SF6
60*75*17.5/18.5NBRCOMBI
55*80*11NBR+AUCOMBI
56*80*13/14.5NBRRWDR-KASSETTE
50*65*18NBR+AUCOMBI SF8
46*65*21NBR+AURWDR-COMBI
65*92*10/15NBR+VITONRWDR-CASSETTE
75*100*13/14.5NBRRWDR-CASSETTE-2
85*110*13/14.5NBR+VITONRWDR-CASSETTE-3
127*160*15.5/17.5NBRRWDR-CASSETTE-3
130*160*14.5/16NBRRWDR-CASSETTE-3
140*170*14.5/16NBRRWDR-KASSETTE-2
145*189*15.5/17NBRCASSETTE
120*160*15/17.5NBRRWDR-K7 KASSETTE
121.8*150*13/15NBRRWDR-K7 KASSETTE
145*175*14.5/15.5NBRRWDR-K7 KASSETTE
165*190*15.5/17NBRRWDR-CASSETTE-2
210*240*14.5/18NBRRWDR-CASSETTE-3
167.8*198*13/15.5NBRRWDR-CASSETTE-3
190*215*15.5/17NBRRWDR-CASSETTE-2
150*180*14.5/16NBR+VITONRWDR-CASSETTE-2
189.8*230*15.5/17NBRCASSETTE-S3
170*200*15/16NBR+VITONRWDR-K7
120*150*14/15.5NBRKASSETTE
130*155*12.5/16NBRKASSETTE
190*220*16/18NBRRWDR-KASSETTE
147*170*15.5/16NBRKASSETTE
110*140*14.5/16NBRRWDR-KASSETTE
32*51*9 NBRGNB1W11

 

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