Accuracy grade of TXR series(standard stock of sleeve type single nut ball screw) are based on C5、Ct7 and Ct10(JIS B 1192-3). Secundum gradum accurationis, Axial lusus 0.005 (Preload C5), 0.02( Ct7) et 0.05mm vel minus Ct10) in stirpe sunt. TXR series (Standard stock of Sleeve type single nut pila cochleae) cochleae scapi cochleae materialis S55C (inductionis obduratio), materia nucis SCM415H (carburizing et induratio), durities pilae superficies cochleae pars est HRC58 vel superior.