NBR rotary shaft seals, often simply referred to as NBR shaft seals or NBR oil seals, are a type of rotary shaft seal designed to prevent the leakage of fluids, such as oil or lubricants, along the rotating shafts of machinery and equipment. NBR stands for Nitrile Butadiene Rubber, which is the primary material used in the construction of these seals.

Here are some key features and characteristics of NBR rotary shaft seals:

1. Nitrile Butadiene Rubber (NBR): NBR is a synthetic rubber compound known for its excellent compatibility with petroleum-based fluids like oils and fuels. It offers good oil resistance, flexibility, and durability, making it a popular choice for sealing applications in various industries.
2. Single Lip Design: Most NBR rotary shaft seals have a single lip that comes into contact with the shaft. This lip is designed to provide a sealing barrier that prevents the escape of fluids and the ingress of contaminants.
3. Dynamic Sealing: NBR rotary shaft seals are designed for dynamic applications, where the shaft is in constant rotation. They maintain their seal even during the rotation of the shaft.
4. Versatility: NBR rotary shaft seals are used in a wide range of applications across various industries, including automotive, manufacturing, agriculture, and more. They are employed in equipment like pumps, motors, gearboxes, and various types of machinery where preventing fluid leakage and protecting internal components from contamination is essential.
5. Temperature and Pressure Tolerance: The performance of NBR rotary shaft seals is influenced by temperature and pressure. They are generally suitable for moderate temperature and pressure conditions, which makes them a cost-effective and reliable choice for many common applications.
6. Installation and Lubrication: Proper installation and lubrication are important for the longevity and effectiveness of NBR rotary shaft seals. Lubrication helps reduce friction, heat generation, and wear on the sealing lip.

NBR rotary shaft seals are widely used due to their effectiveness, cost-efficiency, and compatibility with a range of common industrial fluids. They are typically available in various standard sizes and are easy to install in a wide variety of equipment, serving as an important component to ensure the reliable and efficient operation of machinery and engines.