y the DIN28138 standard. The multi-spring structure has uniform load on the end face of the package and good axial compensation performance. This series of seals are divided into four structural forms:JM-F28 single-end without bearing ,JM-F28L single-end with bearing, JM-F28D double-end without bearing,JM-F28LD double end with bearing. Suitable for most standard connection sizes.