The lead screw of a translating screw jack must be attached to the load which prevents the lead screw from rotating. Otherwise, the lead screw and the load will turn and not translate. A keyed screw jack can prevent lead screw rotation, which has milled keyway along the length of the lead screw. A matching key is fastened to the cover of the jack, which will eliminate jack screw rotation. The keyway in the screw causes greater than normal wear on the internal drive worm gear threads, somewhat reducing screw jack lifespan. Note: JTB series and JTD series ball screw jack anti-rotation devices by square protective pipe with square nut.
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