Nook ActionJac worm gear screw jacks feature 1/4- to 100-ton load-handling capabilities and can be used individually or in multiple arrangements; custom configurations are available. The ball screw jacks use a ball screw and nut made from alloy steel with hardened bearing balls carrying the load between the nut and screw for a rolling action that reduces friction. The machine screw jacks incorporate an Acme screw with a 2C thread form and have a 20:1 or greater gear ratio.

Nook Industries, Inc.; 800-321-7800;