槽或脊，可承受、固定、引导移动装置或设备并减少其摩擦的一种装置。导轨表面上的纵向槽或脊，用于导引、固定机器部件、专用设备、仪器等。QTW外夹式双轴心导轨又称滑轨、线性导轨、线性滑轨、用于直线往复运动场合，拥有比直线轴承更高的额定负载， 同时可以承担一定的扭矩，可在高负载的情况下实现高精度的直线运动。
A groove or ridge that supports, fixes, guides a mobile device or device and reduces its friction. Longitudinal grooves or ridges on the surface of guideways are used for guiding, fixing machine parts, special equipment, instruments, etc. The external clamping double-axle guide of QTW, also known as slideway, linear slideway, linear slideway, for linear reciprocating motion occasions, has a higher rated load than linear bearings, and can bear a certain amount of torque, can achieve high-precision linear motion under high load.