Multiple Spring
S861 Robust Metric / Imperial balanced seal, springs out the fluid, monolithic face.
S865 Robust Metric (DIN) balanced seal, springs out the fluid, monolithic face
S8-1 - S109 Unbalanced O-ring or wedge multiple spring seal
S8B1 – S109B Balanced O-ring or wedge multiple spring seal.
S57B – S58B – S59B Balanced metric (DIN) O-ring or wedge multiple spring seal.
S491 – S891 Springs out the fluid. metric/Imperial balanced seal, with monolithic face.