SBT is a leading supplier of high performance oil seals, rotary shaft seals and hydraulic and pneumatic seals.

SBT specializes in high-performance rotary shaft seals designed to deliver reliable sealing for all types of rotating equipment. Our radial shaft seals and lip seal for rotary shaft solutions retain lubricants while excluding contaminants, ensuring longer equipment life and reduced maintenance. From standard oil rotary shaft seal to custom TC oil seal rotary shaft configurations, SBT provides the precision and durability demanded by modern industry.

Our expertise lies in custom Oil Seals, Rotary Shaft Seals, Grease Seals, Wiper Seals, End Cap VK-HP Seals, U-Packing Seals. These products play a crucial role in separating and protecting components within mechanical equipment.

A rotary shaft seal, also known as a radial shaft seal or lip seal for rotary shaft, is a dynamic sealing device that prevents lubricant leakage and blocks dirt, dust, and moisture from entering rotating machinery. It creates a positive barrier between the rotating shaft and the stationary housing, making it essential for gearboxes, pumps, motors, and countless other applications of rotary shaft seals.

At SBT, we are dedicated to providing you with the highest quality sealing solutions. Trust us to deliver excellence in both product performance and customer service.

Oil Seal / Rotary Shaft Seal Materials

Oil seals play a crucial role in maintaining the integrity of rotating shafts by containing oil-based lubricants within axles, engines, and other machinery. They prevent leaks and ensure the smooth operation of various components. Similarly, grease seals are specifically designed for sealing thicker grease lubricants in rotary shaft applications.

In simple terms, an oil seal acts as a multifunctional barrier with four primary purposes: retaining lubricants or liquids, excluding contaminants, separating fluids, and confining pressure. These seals are vital for keeping machinery running smoothly and efficiently. SBT offers a comprehensive range of oil seals suitable for sealing hydraulic fluids in diverse applications, including pumps, automotive systems, and cylinder manufacturing.

At SBT, we provide rotary oil seals and shaft seals in various styles, sizes, and materials, ensuring a perfect fit for your specific requirements. Our fluid sealing products are available in a wide selection of rubber polymers such as Nitrile (NBR), Viton®, Fluorocarbon (FKM), Silicone (VMQ), Neoprene®, Chloroprene (CR), Ethylene Propylene (EPDM), Polyacrylic (ACM), Styrene Butadiene Rubber (SBR), Fluorosilicone (FVMQ), Polyurethane (AU/EU), Hydrogenated Nitrile (HNBR), and Methyl Vinyl Silicone (MVQ).

To guarantee the highest quality, our oil seals are manufactured using top-grade springs and cases made from carbon steel, stainless steel, or FDA-approved stainless steel. All products adhere to ASTM D2000 standards, ensuring reliability and performance. SBT is well-equipped to supply customized oil and rotary shaft seals based on your OEM drawings and specifications, meeting your unique needs with precision and expertise.

Oil Seal Common Styles

If you are unsure about the specific oil seal style you require, SBT offers a solution. You can send us an actual sample of your existing seal, and we will utilize reverse engineering techniques to accurately replicate the seal for you. Our goal is to provide you with a cost-effective alternative to brand name seals while ensuring premium quality. By choosing our services, you can experience significant savings without compromising on performance.

Among the most commonly used oil seal styles are TC, SC, TA, SA, TB, SB, and VC. It's worth noting that oil seal types TA, SA, TB, and SB have bare steel on their outer diameter (OD) widths. At SBT, we offer various processing options for the OD widths of these seals. You can choose from ground OD, highly polished bright steel, coated OD, or painted with a rubber coating to fill in small cracks in the OD housing. On the other hand, the remaining common seal types have OD widths that are covered with rubber.

By leveraging our expertise and capabilities, SBT ensures that you receive the ideal oil seal style for your specific requirements. Our commitment to quality and affordability sets us apart as a reliable provider of premium sealing solutions.

Oil Seal / Shaft Seal Designs

Oil Seal / Shaft Seal Styles

1. Radial Lip Seal: This is the most common and widely used style of oil seal. It features a flexible lip that makes contact with the rotating shaft, creating a barrier to prevent oil leakage.

2. Single Lip Seal: As the name suggests, this style has a single lip that provides sealing action against the shaft. It is suitable for applications with moderate sealing requirements.

3. Double Lip Seal: This style has two lips, which enhance the sealing performance by providing an extra layer of protection against oil leakage. The inner lip faces the fluid or oil being sealed, while the outer lip acts as a dust and dirt exclusion seal.

4. V-Ring Seal: Also known as V-Seals, these seals have a V-shaped profile that fits over the shaft. They provide effective sealing even in dynamic applications with significant axial movement.

5. Cassette Seal: This style consists of multiple sealing elements arranged in a cartridge-like assembly. It offers enhanced sealing performance and can handle high-pressure applications.

6. Spring-Loaded Seal: These seals feature a metal spring that applies radial pressure on the sealing lip, ensuring continuous contact with the shaft and optimizing the sealing effectiveness.

7. Split Seal: This style is designed for easy installation and replacement. It can be split into two halves, allowing it to be fitted around an existing shaft without the need for disassembly.

8. Labyrinth Seal: Labyrinth seals are non-contact seals that use a series of interlocking grooves or fins to create a tortuous path for fluids, preventing their escape.

9. Excluder Seal: This style is primarily used to exclude contaminants, such as dirt and dust, from entering the system. It offers minimal sealing against fluids but excels in keeping external particles out.

How Rotary Shaft Seals Work

How rotary shaft seals work relies on a flexible sealing lip (usually rubber) pressed against the shaft by a garter spring. The lip forms a tight, dynamic contact that retains oil or grease inside while excluding external contaminants. A thin lubricant film reduces friction and wear, while the spring compensates for shaft runout and wear over time. This design delivers effective sealing at both low and high speeds with minimal power loss.

Rotary Shaft Seal and Oil Seal Markets

SBT’s custom oil seals and shaft seals are currently used in the following industries.
We excel in gearbox related applications for the following industries:

• Gearboxes

• Fuel Pumps

• Augers Mixers & Dryers

• Casters

• Drilling Spindles

• Electric Motors

• Propeller Shafts

• Transmissions

• Compressors

• Liquid Handling Swivel

• Rolling Mill

• Vacuum Pumps

• Fuel Handling Flexible

• Couplings

• Geo-Rotors

• Racing Engines

• Hydrostatic

• Joints

• Agitators

• Gear Pumps

• Crank Shaft

• Hydraulic Motors & Pumps

• Wheel Hubs

If you would like more information about our range of Rotary Shaft Seals, download our catalogue, or contact a member of the team.

More informations might help you:

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What is Oil Seal | Purpose , Types of Oil Seal , Advantages

A Guide to Select Oil Seals for Your Industrial Application