Oil Seal TB - Rotary Shaft Seal

What is a TB Oil Seal?

Features and Benefits

The oil seal TB offers a variety of advantages. Besides the structural advantages, the rotary shaft seal provides operational reliability in rotating systems by preserving lubrication and preventing downtime. It’s double lip design ensures a consistent contact pressure over extended periods. In contaminated environments, the dust lip helps reduce internal wear by serving as the first barrier, keeping dust, dirt and moisture out.

This seal is typically made of NBR (nitrile elastomer), a material known for its durability, flexibility, and compatibility with mineral oil-based lubricants. For extremer conditions, it’s also available in FKM (Viton®), HNBR and other elastomers. The metal casing is produced in accordance with DIN EN 10139, and the spring element is manufactured from spring steel according to DIN EN 10270-1, with stainless steel options available for corrosive environments. Combined with options like bore sealant coatings or pairing with AS-10 axial seals and V-ring seals, the TB oil seal can be configured into a comprehensive sealing system for the most demanding environments. These design features not only protect internal components but also reduce bearing wear and overall maintenance cycles, making the TB seal a preferred solution across industries. The TB design is compatible with a wide range of shaft types and applications.

Lip Material Options

Choosing the right oil seal

When selecting the right TB rotary shaft seal, it’s important to keep eye on some very important parameters. You must match the oil seal TB with the shaft diameter and housing bore tolerance, verify the temperature range based on the application, account for shaft speed and system pressure, and secure chemical compatibility with the fluid being sealed. The shaft should meet ISO H11 tolerance and have a minimum hardness of 45HRC to withstand wear, with surface roughness between Ra 0.2 - 0.8 µm and Rz 1 - 5 µm. The housing bore must comply with ISO H8 tolerance and present roughness values between Ra 0.8 – 3.2 2 µm to ensure a secure press-fit. Additionally, while the standard TB seal is compatible with mineral oil-based lubricants, alternative elastomers such as FKM or HNBR should be considered for applications involving synthetic lubricants or higher temperatures. Maximum allowable shaft speeds should be checked against standard rotary shaft seal performance charts for longevity and efficiency. By taking these parameters into account, engineers can ensure optimal sealing performance and extended service life.

Applications

TB oil seals are commonly used in gearboxes to retain lubricants and prevent dirt from entering, in electric motors to ensure lubricant containment and dust exclusion, and in pumps and compressors where dynamic sealing is essential. In agriculture and construction, oil seals TB protect vital components from mud, dust, and environmental exposure while withstanding mechanical loads.

Common Designations and Cross-References

There’s a variety of manufacturers and suppliers which all have their own names for the oil seal. In the table below you’ll find some of the most important ones, relevant to this particular oil seal TB design.

FAQ