Hydraulic jacks and screw jacks serve the same basic purpose, allowing mechanics to lift and support heavy loads in the shop. That said, there are some pretty major differences in how they work, the ...
For use on D-subminiature connectors as a mounting screw, Sems jack screws are precision manufactured in 0.285, 0.347, and 0.660-in. lengths. The screws feature a chromate-coated, zinc-plated body ...