AML ultra high vacuum compatible linear translation stages provide long travel with minimum height for loads of up to several kilograms They have widely spaced 'V' roller guides and are useful in simpler compound mechanisms where torsional loads are small. They are manufactured with UHV compatible material and construction methods and utilize AML UHV stepper motors. Smooth motion is provided by a diamond corrected lead screw and a matched, precision lapped nut to ensure good positional stability and incorporate a preloaded leadscrew nut to eliminate backlash.