Worm shafts, worm shaft, screw shafts

Worm gear sets – Catalogue Page 3
... (quality according DIN 3974: worm shaft 6, worm wheel 7, other version available on request) We guarantee that similar worm shafts and worm gears can be replaced if they have not yet been run in... This does not apply to worm gear sets with reduced gear backlash. These gear sets are adapted to the dimension measured ...

Ball screws – Catalogue Page 6
... Critical rotating speed for screw shafts The shaft is equated to a cylinder, the diameter of which is the root diameter of the thread... The formulas use a parameter the value of which is dictated by the mounting of the screw shaft (whether it is simply supported or fixed)