The circular knife shears are used to cut strip material lengthwise. The circular knife shears are equipped with 2 driven knife shafts. The circular knives are pushed onto the shafts and fastened by means of hydraulic clamping nuts. For this purpose, the right-hand bearing unit can be moved in an axial direction via the handwheel and then swiveled. The upper knife shaft can be adjusted via worm gear screw jacks.