The 281 Lab Jack is uniquely designed to provide smooth, stable 76 mm height adjustment and a high 1334 N load capacity. It features 1/4-20 threads on the top plate and M6 threads on the bottom plate, and can be slot mounted with either plate on the top.
Conventional scissors and dual-pantograph jacks lift by decreasing the distance between crossed members and are inherently less stable at higher elevations. In contrast, Newport’s innovative design employs three orthogonal hinges that straighten to form a box, becoming more stable with increasing height. The side mounted height adjustment controls a stout drive screw connecting the pivot pins of the broad side hinges. The end hinge prevents tilting or swaying and ensures only vertical motion.
The 281 offers 3 full inches of vertical adjustment with 48 revolutions of the adjustment knob. The model 271 has lower sensitivity and a smaller adjustment range.
The 271 and 281 Lab Jacks are both English and Metric compatible. The top plate has an array of 1/4-20 tapped holes on 1 in. centers while the bottom plate has an array of M6 holes on 25 mm centers. Both the top and bottom plates have four clearance slots used for mounting the lab jack to optical tables.
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