Sealing Excellence, Securing Industry

CFKS TG4 Oil Seal 40*55*8 High Temperature FKM TG4 Skeleton Oil Seal TG4 Rotary Shaft Seal

Engineered for the most demanding industrial environments, this heavy-duty double skeleton oil seal provides uncompromising zero-leakage performance under extreme pressures. Featuring a dual-cage reinforcement design, it effectively isolates process media while blocking external contaminants, significantly extending equipment MTBF.

  • Dual-Skeleton Rigidity: Reinforced double-cage structural steel core prevents seal deformation under high-pressure spikes.

  • Zero-Leakage Dual Lip: Primary and secondary precision-engineered sealing lips deliver bidirectional fluid retention and dust exclusion.

  • Advanced Elastomer Compound: Available in premium NBR and FKM to withstand aggressive chemical corrosion and thermal stress.

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

Product Name Heavy-Duty Double Skeleton Oil Seal Specification 40*55*8
Material  NBR / FKM / PU Feature High-pressure resistance, zero leakage
Work Temperature -20℃ to 220℃ Usage Hydraulic pumps, gearboxes, reducers, mixers, heavy axles
Hardness 70 – 90 Shore A Type Dual-Lip Reinforced Rotary Shaft Seal

The heavy-duty double skeleton oil seal operates on an advanced axial and radial pressure-balancing principle. Unlike standard single-skeleton seals, the integrated dual-cage architecture provides superior structural rigidity, preventing lip collapse under high-pressure conditions. As the shaft rotates, the primary sealing lip utilizes hydrodynamic hydrodynamic pumping actions to channel escaping fluid back into the reservoir. Simultaneously, the secondary lip utilizes centrifugal force to repel external abrasives, maintaining a reliable elastomeric micro-contact zone even during shaft misalignment or dynamic runout.

Optimizing cross-linked polymer matrices is critical for handling aggressive industrial media. We offer this profile in high-saturation NBR for standard hydraulic oils and exceptional wear resistance, as well as premium FKM for high-temperature and highly corrosive chemical applications. These compounds are engineered to resist chemical degradation, swelling, and ozone cracking, ensuring the structural integrity of the seal lip remains uncompromised over millions of high-velocity rotational cycles.

Minimizing industrial downtime requires components that are both robust and practical to maintain. The heavy-duty skeleton profile is precision-molded to ensure optimized interference fitment within the housing bore, eliminating the risk of OD bypassing. Its low-friction lip geometry minimizes localized frictional heat generation, drastically reducing shaft scoring and wear. This optimized contact pressure distribution translates directly to an extended service life, reducing emergency maintenance intervals and lowering total cost of ownership.

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
TC/TG TYPE SEAL SIZE LIST
No.Product NameTypeSIZEColorMaterial
1Rubber Oil SealTC / TGTC 10*18*5Black/BrownNBR/VITON
2Rubber Oil SealTC / TGTC 10*19*5Black/BrownNBR/VITON
3Rubber Oil SealTC / TGTC 10*20*7Black/BrownNBR/VITON
4Rubber Oil SealTC / TGTC 12*19*5Black/BrownNBR/VITON
5Rubber Oil SealTC / TGTC 12*22*7Black/BrownNBR/VITON
6Rubber Oil SealTC / TGTC 15*24*7Black/BrownNBR/VITON
7Rubber Oil SealTC / TGTC 15*28*5Black/BrownNBR/VITON
8Rubber Oil SealTC / TGTC 15*30*7Black/BrownNBR/VITON
9Rubber Oil SealTC / TGTC 16*24*7Black/BrownNBR/VITON
10Rubber Oil SealTC / TGTC 17*35*5Black/BrownNBR/VITON
11Rubber Oil SealTC / TGTC 19*32*7Black/BrownNBR/VITON
12Rubber Oil SealTC / TGTC 20*45*7Black/BrownNBR/VITON
13Rubber Oil SealTC / TGTC 20*47*7Black/BrownNBR/VITON
14Rubber Oil SealTC / TGTC 20*52*7Black/BrownNBR/VITON
15Rubber Oil SealTC / TGTC 22*35*5Black/BrownNBR/VITON
16Rubber Oil SealTC / TGTC 22*35*7Black/BrownNBR/VITON
17Rubber Oil SealTC / TGTC 22*47*7Black/BrownNBR/VITON
18Rubber Oil SealTC / TGTC 24*42*7Black/BrownNBR/VITON
19Rubber Oil SealTC / TGTC 25*37*5Black/BrownNBR/VITON
20Rubber Oil SealTC / TGTC 25*46*7Black/BrownNBR/VITON
21Rubber Oil SealTC / TGTC 25*52*7Black/BrownNBR/VITON
22Rubber Oil SealTC / TGTC 28*40*10Black/BrownNBR/VITON
23Rubber Oil SealTC / TGTC 28*47*10Black/BrownNBR/VITON
24Rubber Oil SealTC / TGTC 30*52*10Black/BrownNBR/VITON
25Rubber Oil SealTC / TGTC 30*58*10Black/BrownNBR/VITON
26Rubber Oil SealTC / TGTC 30*60*10Black/BrownNBR/VITON
27Rubber Oil SealTC / TGTC 30*62*7Black/BrownNBR/VITON
28Rubber Oil SealTC / TGTC 32*45*10Black/BrownNBR/VITON
29Rubber Oil SealTC / TGTC 35*47*7Black/BrownNBR/VITON
30Rubber Oil SealTC / TGTC 35*50*7Black/BrownNBR/VITON
31Rubber Oil SealTC / TGTC 35*62*10Black/BrownNBR/VITON
32Rubber Oil SealTC / TGTC 35*72*12Black/BrownNBR/VITON
33Rubber Oil SealTC / TGTC 38*52*10Black/BrownNBR/VITON
34Rubber Oil SealTC / TGTC 40*52*8Black/BrownNBR/VITON
35Rubber Oil SealTC / TGTC 40*55*8Black/BrownNBR/VITON
36Rubber Oil SealTC / TGTC 40*58*8Black/BrownNBR/VITON
37Rubber Oil SealTC / TGTC 40*62*10Black/BrownNBR/VITON
38Rubber Oil SealTC / TGTC 40*65*10Black/BrownNBR/VITON
39Rubber Oil SealTC / TGTC 40*72*10Black/BrownNBR/VITON
40Rubber Oil SealTC / TGTC 40*75*10Black/BrownNBR/VITON
41Rubber Oil SealTC / TGTC 42*62*10Black/BrownNBR/VITON
42Rubber Oil SealTC / TGTC 42*72*10Black/BrownNBR/VITON
43Rubber Oil SealTC / TGTC 45*60*8*Black/BrownNBR/VITON
44Rubber Oil SealTC / TGTC 45*62*8Black/BrownNBR/VITON

MESSAGE

Go to Top