Sealing Excellence, Securing Industry

CFKS NBR J Type Oil Seal 28*40*5/9 Single Lip with Spring J Type Oil Seal

CFKS NBR J type 28-40-5/9 oil seal 28 40 5/9 is a single lip, spring-loaded oil seal designed for rotary shaft sealing. Made from oil-resistant NBR rubber, this J type 28×40×5/9 oil seal 28*40*5/9 provides reliable oil retention, stable sealing pressure, and reduced leakage. Commonly used in gearboxes, pumps, and motors, it ensures consistent sealing performance and long service life in industrial machinery. Find your sealing solution with CFKS — contact us for a quote.

Brand Name CFKS OEM  Accpetable
Material NBR FKM Silicone  Features  wear resistance
Dimensions Customized Certificate  ISO9001/TS16949
Type 28*40*5/9 J Type Oil Seal  Packing 1 pc per bag

 

The CFKS NBR J Type oil seal 28*40*5/9 is a high-quality single lip oil seal designed for reliable rotary shaft sealing applications. Featuring a spring-loaded sealing lip, this J type oil seal ensures stable contact pressure and effective oil retention during operation.

Manufactured from oil-resistant NBR rubber, this J type oil seal offers excellent resistance to lubricating oils, grease, and moderate temperatures. The integrated garter spring improves sealing efficiency, compensates for wear, and helps maintain consistent sealing performance over time.

CFKS J type oil seals are widely used in gearboxes, motors, pumps, and industrial machinery. With precise dimensions and durable material, this single lip oil seal delivers dependable sealing performance, reduced leakage, and long service life in various industrial shaft sealing applications.

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
J TYPE SEAL SIZE LIST
TypeSIZEMaterialSIZEMaterial
J Type8*18*7PU8*18*7NBR/FKM
J Type10*20*7PU10*20*7NBR/FKM
J Type12*22*7PU12*22*7NBR/FKM
J Type14*24*7PU14*24*7NBR/FKM
J Type16*26*7PU16*26*7NBR/FKM
J Type18*28*7PU18*28*7NBR/FKM
J Type20*32*9PU20*32*9NBR/FKM
J Type22*34*9PU22*34*9NBR/FKM
J Type25*37*9PU25*37*9NBR/FKM
J Type28*40*9PU28*40*9NBR/FKM
J Type30*42*9PU30*42*9NBR/FKM
J Type32*44*9PU32*44*9NBR/FKM
J Type35*47*9PU35*47*9NBR/FKM
J Type36*48*9PU36*48*9NBR/FKM
J Type38*50*9PU38*50*9NBR/FKM
J Type40*52*9PU40*52*9NBR/FKM
J Type45*57*9PU45*57*9NBR/FKM
J Type50*62*9PU50*62*9NBR/FKM
J Type52*64*9PU52*64*9NBR/FKM
J Type55*69*11PU55*69*11NBR/FKM
J Type60*74*11PU60*74*11NBR/FKM
J Type63*77*11PU63*77*11NBR/FKM
J Type65*79*11PU65*79*11NBR/FKM
J Type70*84*11PU70*84*11NBR/FKM
J Type75*89*11PU75*89*11NBR/FKM
J Type80*94*11PU80*94*11NBR/FKM
J Type85*99*11PU85*99*11NBR/FKM
J Type87*101*11PU87*101*11NBR/FKM
J Type90*104*11PU90*104*11NBR/FKM
J Type92*106*11PU92*106*11NBR/FKM
J Type95*109*11PU95*109*11NBR/FKM
J Type100*114*11PU100*114*11NBR/FKM
J Type105*121*13PU105*121*13NBR/FKM
J Type110*126*13PU110*126*13NBR/FKM
J Type115*131*13PU115*131*13NBR/FKM
J Type120*136*13PU120*136*13NBR/FKM
J Type125*141*13PU125*141*13NBR/FKM
J Type130*146*13PU130*146*13NBR/FKM
J Type135*151*13PU135*151*13NBR/FKM

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