Manual Lab Jack

   The 540 and 560 lab jacks incorporate a unique scissor design with low backlash pivots that make the platform virtually wobble-free at any location along the vertical travel.  The large adjustment knob is attached to a rolled brass lead screw to ensure smooth stiction free adjustment even under heavy loads.
   Both models use a unique concept of a single design for both U.S. system and metric compatibility.  In one orientation, the top plate has an array of 1⁄4-20 tapped holes spaced on one-inch centers for the U.S. system; the bottom plate has slots set at two-inch centers for mounting to a U.S. system isolation table.  With the lab jack turned over, the top plate now has an array of M6 tapped holes spaced on 25-mm centers for metric compatibility; the bottom plate now has slots set at 50-mm centers for mounting to a metric isolation table.