... rolls are individually adjusted.Common to most screw jacks for powered straighteners are the following elements:6pcs translating screw jacks, ... 8 pcs translating screw jacks….for each powered straighteners.Inverted type jacks, self-locking screw, threaded ends ... stroke is very short, usually, 70 mm~100 mm.For powered straighteners, NOSEN screw jack RN-Series, RNF-Series are ...