with parallel axes and that mesh with one another with screw shaped ribs and grooves for example fig2 shows screw compressor 80 which constitutes the third stage of the three stage compressor system of fig1 said compressor being especially designed for high pressures of preferably about 40 bar and above the screw compressor shown in fig2 has a rotor housing 1 shown in a longitudinal section in which two rotors 3 and 5 are rotatably held with parallel axes the rotating axes of the rotors 3 5 lie in a common vertical plane each rotor 3 5 has a profile section 7 and 9 with a profile that contains screw shaped ribs and grooves wherein the ribs and grooves of the two profile sections 7 9 mesh with one another to form a seal on both sides of the profile sections 7 9 are shaft pins 7 a 7 b 9 a 9 b the surfaces of which cooperate with seal arrangements 11 12 to seal the rotor in the rotor housing 1 the shaft pins 7 a 7 b 9 a 9 b are also rotatably held in the rotor housing 1 with bearings 13 15 the upper rotor 3 in fig2 is the main rotor at the left end of which in fig2 is an extended shaft pin 7 c that extends into the gearbox 90 fig1 and supports a gear 85 that meshes with a drive gear in the gearbox in order to turn the rotor 3 at the right end in fig2 the two rotors 3 5 have two gears 17 19 that mesh with one another thus forming a synchronization unit synchronizing transmission that conveys the rotation of.