Seals are the key components of hydraulic cylinders, hydraulic components, rotating shafts and related mating parts. The quality of seals is related to the normal operation and service life of the whole set of equipment. Therefore, how to correctly understand and select seals is crucial for users. Therefore, we have made this set of seals manual based on years of experience in sealing applications. The manual of rotary oil seal mainly introduces the collection of rotary skeleton oil seal, rotary frameless oil seal, V-shaped seal, hole used rotary oil seal, shaft used rotary oil seal, etc.