Cylindrical cylinders The Norgren range of cylindrical cylinders covers a full range of orifice diameters from 8 mm to 63 mm, in single-acting and double-acting variants. Request a Quote RM/8000/M, ISO cylinder Magnetic piston, double acting RT/57200/M, RM/57200/M, Rounding cylinder Magnetic piston, double acting RT/57100/M, RM/57300/M, Rounding cylinder Magnetic piston, single acting RM/55401/M, Roundline cylinder Magnetic piston, double acting