... . Thrust Collar, Shaft Ring and Seat RingThrust Collar, Series AS, LS, GS, WS, ZS, TRA, TRB, TRC TRD.Series AS thrust collar ... , Series AS collar shall play its full action.Series GS, WS, LS thrust collars are made of bearing steel with the quenching ... of GS seat ring and theinner surface of WS shaft ring are ground. Series LS thrust collar is an economic product with ...