Shaft seals, bearing housings, headwheels and cable pulleys, crank shafts; single and double mechanical seals with gas or liquid lubrication for sealing liquid or gaseous media; cassette-type mechanical seals; mechanical seals with confining fluid seals; mechanical seals with a flushing function; mechanical seals with leakage recirculation; mechanical seals with leakage control; slide rings; all the aforesaid goods being parts of machines.